{"id":30400,"date":"2026-07-24T12:56:41","date_gmt":"2026-07-24T04:56:41","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30400"},"modified":"2026-07-24T14:44:08","modified_gmt":"2026-07-24T06:44:08","slug":"pcs-inverter-surge-protection-for-bess-ac-dc-and-communication-spd-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/","title":{"rendered":"Protezione da sovratensioni per inverter PCS per BESS: Guida agli SPD AC, DC e di comunicazione"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30400\" class=\"elementor elementor-30400\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-59e7d34 e-flex e-con-boxed e-con e-parent\" data-id=\"59e7d34\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6cb1128 elementor-widget elementor-widget-html\" 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750;\r\n  }\r\n}\r\n\r\n@media (max-width: 540px) {\r\n  #leeyee-pcs-inverter-surge-guide .ly-interface-strip {\r\n    grid-template-columns: 1fr;\r\n  }\r\n}\r\n\r\n@media (max-width: 480px) {\r\n  #leeyee-pcs-inverter-surge-guide h2 {\r\n    margin-top: 1.9em;\r\n    font-size: 26px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide .ly-quick,\r\n  #leeyee-pcs-inverter-surge-guide .ly-checklist,\r\n  #leeyee-pcs-inverter-surge-guide .ly-cta,\r\n  #leeyee-pcs-inverter-surge-guide .ly-toc {\r\n    padding: 18px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide .ly-callout,\r\n  #leeyee-pcs-inverter-surge-guide .ly-warning,\r\n  #leeyee-pcs-inverter-surge-guide .ly-risk,\r\n  #leeyee-pcs-inverter-surge-guide .ly-engineering,\r\n  #leeyee-pcs-inverter-surge-guide .ly-evidence {\r\n    padding: 18px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide .ly-step {\r\n    padding: 61px 17px 17px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide .ly-step::before {\r\n    top: 16px;\r\n    left: 17px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide .ly-table-wrap td {\r\n    padding: 43px 13px 12px;\r\n  }\r\n\r\n  #leeyee-pcs-inverter-surge-guide .ly-table-wrap td::before {\r\n    top: 10px;\r\n    width: calc(100% - 26px);\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-pcs-inverter-surge-guide\">\r\n  <p class=\"ly-intro\">\r\n    A BESS power conversion system connects the battery-side DC circuit to an AC switchboard, transformer, grid or local load. The same PCS may also connect to a BMS, EMS, SCADA platform, auxiliary supply and several communication networks.\r\n  <\/p>\r\n\r\n  <p class=\"ly-intro\">\r\n    Each conductive interface can become a surge entry path. PCS inverter surge protection should therefore be reviewed as an interface-coordination problem\u2014not as a request for one generic SPD selected only from PCS power or nominal voltage.\r\n  <\/p>\r\n\r\n  <section class=\"ly-quick\" id=\"quick-answer\">\r\n    <span class=\"ly-label\">Quick Answer<\/span>\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#does-a-pcs-inverter-in-a-bess-need-surge-protection\" >Does a PCS Inverter in a BESS Need Surge Protection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#define-the-protection-boundary-around-the-pcs\" >Define the Protection Boundary Around the PCS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#how-should-the-pcs-ac-side-be-protected\" >How Should the PCS AC Side Be Protected?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#how-should-the-pcs-dc-input-be-protected\" >How Should the PCS DC Input Be Protected?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#is-the-spd-inside-the-pcs-enough\" >Is the SPD Inside the PCS Enough?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#confirm-these-items-before-removing-external-protection\" >Confirm These Items Before Removing External Protection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#protect-communication-and-auxiliary-interfaces\" >Protect Communication and Auxiliary Interfaces<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#grounding-bonding-and-installation-position\" >Grounding, Bonding and Installation Position<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#a-practical-pcs-spd-selection-process\" >A Practical PCS SPD Selection Process<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#how-the-protection-logic-changes-by-bess-layout\" >How the Protection Logic Changes by BESS Layout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#common-pcs-surge-protection-mistakes\" >Common PCS Surge Protection Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#information-required-before-a-pcs-spd-order\" >Information Required Before a PCS SPD Order<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#send-these-parameters-to-the-spd-supplier\" >Send These Parameters to the SPD Supplier<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#share-your-pcs-interface-requirements\" >Share Your PCS Interface Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#related-technical-guides\" >Related Technical Guides<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"does-a-pcs-inverter-in-a-bess-need-surge-protection\"><\/span>Does a PCS Inverter in a BESS Need Surge Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p class=\"ly-answer\">\r\n      The AC, battery DC, communication and auxiliary interfaces of a BESS PCS should each be assessed for coordinated surge protection.\r\n    <\/p>\r\n\r\n    <p>\r\n      The final arrangement depends on the PCS manual, maximum operating voltages, earthing and grounding arrangements, prospective fault current, cable routing, lightning exposure, internal PCS protection and project specification.<sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <div class=\"ly-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>PCS interface<\/th>\r\n            <th>Protection direction<\/th>\r\n            <th>Main confirmation<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"PCS interface\"><strong>DC input<\/strong><\/td>\r\n            <td data-label=\"Protection direction\">BESS DC SPD selected for the actual battery-side circuit<\/td>\r\n            <td data-label=\"Main confirmation\">Maximum DC voltage, pole-to-earth voltage, grounding topology and fault current<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"PCS interface\"><strong>AC connection<\/strong><\/td>\r\n            <td data-label=\"Protection direction\">Coordinated AC SPD at the relevant PCS or switchboard boundary<\/td>\r\n            <td data-label=\"Main confirmation\">AC voltage, earthing system, LPS, upstream SPD and installation position<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"PCS interface\"><strong>RS485 \/ CAN<\/strong><\/td>\r\n            <td data-label=\"Protection direction\">Signal SPD matched to the circuit<\/td>\r\n            <td data-label=\"Main confirmation\">Working voltage, data rate, capacitance, shielding and grounding<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"PCS interface\"><strong>Ethernet<\/strong><\/td>\r\n            <td data-label=\"Protection direction\">Network SPD where copper cabling crosses a protection boundary<\/td>\r\n            <td data-label=\"Main confirmation\">Network speed, PoE status, connector, cable category and shield bonding<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"PCS interface\"><strong>Auxiliary supply<\/strong><\/td>\r\n            <td data-label=\"Protection direction\">AC or DC SPD according to the real auxiliary circuit<\/td>\r\n            <td data-label=\"Main confirmation\">Supply voltage, source, cable exposure and equipment withstand level<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p>\r\n      <strong>Buyer meaning:<\/strong> \u201c1 MW PCS\u201d or \u201c1,500 V PCS\u201d is not enough information for SPD selection. The supplier needs interface-specific electrical and installation data.\r\n    <\/p>\r\n\r\n    <p class=\"ly-scope\">\r\n      <strong>Scope:<\/strong> This guide focuses on external and cabinet-level SPDs for PCS power, communication and auxiliary interfaces. It does not cover component-level TVS, MOV, GDT or PCB surge-circuit design inside the converter.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img fetchpriority=\"high\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/bess-pcs-ac-dc-communication-surge-protection-architecture.webp\"\r\n      alt=\"BESS PCS inverter surge protection architecture showing AC, DC and communication interface protection\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"eager\"\r\n      fetchpriority=\"high\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      PCS protection should be reviewed at the battery DC, AC power, communication and auxiliary interfaces. The diagram shows evaluation points, not one mandatory wiring arrangement for every BESS.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <section class=\"ly-toc\">\r\n    <p class=\"ly-toc-title\">On This Page<\/p>\r\n    <ol>\r\n      <li><a href=\"#pcs-boundary\">Define the PCS protection boundary<\/a><\/li>\r\n      <li><a href=\"#pcs-ac-side\">PCS AC-side surge protection<\/a><\/li>\r\n      <li><a href=\"#pcs-dc-side\">PCS DC-input protection<\/a><\/li>\r\n      <li><a href=\"#pcs-internal-spd\">Is the internal PCS SPD enough?<\/a><\/li>\r\n      <li><a href=\"#pcs-communication\">Communication and auxiliary interfaces<\/a><\/li>\r\n      <li><a href=\"#pcs-grounding\">Grounding and installation position<\/a><\/li>\r\n      <li><a href=\"#pcs-selection-process\">Project selection process<\/a><\/li>\r\n      <li><a href=\"#pcs-project-layouts\">Common BESS layouts<\/a><\/li>\r\n      <li><a href=\"#pcs-mistakes\">Common mistakes<\/a><\/li>\r\n      <li><a href=\"#pcs-ordering\">OEM and project checklist<\/a><\/li>\r\n      <li><a href=\"#pcs-faq\">Frequently asked questions<\/a><\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n  <h2 id=\"pcs-boundary\"><span class=\"ez-toc-section\" id=\"define-the-protection-boundary-around-the-pcs\"><\/span>Define the Protection Boundary Around the PCS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A PCS is a bidirectional power converter between a DC energy-storage source and an AC electrical system. IEC 62909-1:2025 covers general and safety aspects of relevant bidirectional grid-connected power converters with system voltages not exceeding 1,000 V AC or 1,500 V DC.<sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 62477-1:2022 provides a broader safety framework for power electronic converter systems and their associated control, protection, monitoring and measurement functions.<sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    For surge protection, the PCS should not be treated as one closed box. The project team should identify every conductive line entering or leaving its enclosure.\r\n  <\/p>\r\n\r\n  <div class=\"ly-interface-strip\">\r\n    <div class=\"ly-interface-item\">\r\n      <strong>Battery DC<\/strong>\r\n      <span>Battery cabinet, DC combiner and PCS input<\/span>\r\n    <\/div>\r\n    <div class=\"ly-interface-item\">\r\n      <strong>AC Power<\/strong>\r\n      <span>PCS terminal, switchboard, transformer or PCC<\/span>\r\n    <\/div>\r\n    <div class=\"ly-interface-item\">\r\n      <strong>Communication<\/strong>\r\n      <span>RS485, CAN, Ethernet and digital I\/O<\/span>\r\n    <\/div>\r\n    <div class=\"ly-interface-item\">\r\n      <strong>Auxiliary Power<\/strong>\r\n      <span>AC or low-voltage DC control supplies<\/span>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-callout\">\r\n    <span class=\"ly-label\">Protection Boundary<\/span>\r\n    <p>\r\n      Give special attention to cables that leave one cabinet, container, building or bonded zone and enter another. These routes can expose the PCS to conducted or induced transients even when the main enclosure already contains internal protection.<sup><a href=\"#ref-10\">[10]<\/a><\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    The practical question is not only \u201cDoes the PCS contain an SPD?\u201d The project should ask:\r\n  <\/p>\r\n\r\n  <p>\r\n    <strong>Which interfaces cross an external or internal protection boundary, what protection already exists, and what voltage can the PCS terminal safely withstand?<\/strong>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/pcs-interface-spd-selection-comparison.webp\"\r\n      alt=\"Comparison of SPD selection requirements for PCS AC, DC, signal and Ethernet interfaces\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      One PCS can require several different protection decisions. AC, battery DC, signal and Ethernet interfaces must be checked against their own operating conditions.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2 id=\"pcs-ac-side\"><span class=\"ez-toc-section\" id=\"how-should-the-pcs-ac-side-be-protected\"><\/span>How Should the PCS AC Side Be Protected?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The PCS AC interface may connect to a low-voltage switchboard, transformer, point of common coupling or local microgrid. The correct SPD position depends on where a surge can enter and where the protected PCS terminal is located.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 61643-11:2025 applies to SPDs connected to AC low-voltage power systems. IEC 61643-12:2020 provides selection, location, operation and coordination principles for AC power SPDs.<sup><a href=\"#ref-4\">[4]<\/a><\/sup><sup><a href=\"#ref-5\">[5]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>Common AC-side evaluation points<\/h3>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Position<\/th>\r\n          <th>Protection purpose<\/th>\r\n          <th>What must be confirmed<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Position\"><strong>Main LV board or AC service boundary<\/strong><\/td>\r\n          <td data-label=\"Protection purpose\">Limits surges entering from the supply, transformer or external AC route<\/td>\r\n          <td data-label=\"What to confirm\">Lightning risk, LPS, supply arrangement, fault current and project rules<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Position\"><strong>PCS AC terminal or local PCS panel<\/strong><\/td>\r\n          <td data-label=\"Protection purpose\">Limits residual or locally induced voltage close to the PCS interface<\/td>\r\n          <td data-label=\"What to confirm\">Distance from upstream SPD, cable route, coordination and PCS manual<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Position\"><strong>Auxiliary AC distribution<\/strong><\/td>\r\n          <td data-label=\"Protection purpose\">Protects controllers, fans, HVAC, heaters, UPS and monitoring supplies<\/td>\r\n          <td data-label=\"What to confirm\">Separate source, voltage, earthing and cable exposure<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    These are evaluation positions. They do not mean that every BESS needs an SPD at all three points.\r\n  <\/p>\r\n\r\n  <h3>Confirm voltage across each protection mode<\/h3>\r\n\r\n  <p>\r\n    Do not select the AC SPD only from the line-to-line voltage. The supplier needs the voltage across each intended protection mode, including line-to-neutral or line-to-earth where applicable.\r\n  <\/p>\r\n\r\n  <p>\r\n    The earthing arrangement must also be identified. TN-S, TN-C-S, TT and IT systems can require different connection configurations and different treatment of the neutral-to-earth path.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-label\">Project Confirmation Required<\/span>\r\n    <p>\r\n      Do not state that every PCS AC connection requires Type 1, Type 1+2 or Type 2 protection. The required SPD Type depends on the installation boundary, lightning-current path, external LPS, upstream protection and applicable project rules.<sup><a href=\"#ref-5\">[5]<\/a><\/sup><sup><a href=\"#ref-10\">[10]<\/a><\/sup>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>Check short-circuit safety separately from surge ratings<\/h3>\r\n\r\n  <p>\r\n    In, Imax and Iimp describe surge-test performance. They do not describe whether the SPD remains safe during a power-frequency fault.\r\n  <\/p>\r\n\r\n  <p>\r\n    Confirm the prospective short-circuit current, upstream fuse or breaker and the SPD manufacturer\u2019s backup-protection conditions. The related <a href=\"https:\/\/www.cnspd.com\/spd-sccr-rating\/\">SPD SCCR and Isccr guide<\/a> explains this project check in more detail.\r\n  <\/p>\r\n\r\n  <h2 id=\"pcs-dc-side\"><span class=\"ez-toc-section\" id=\"how-should-the-pcs-dc-input-be-protected\"><\/span>How Should the PCS DC Input Be Protected?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The PCS DC input may connect directly to battery racks, a battery cabinet, a DC combiner or a separate DC distribution cabinet. This page focuses on the protection boundary at the PCS input and its coordination with the battery-side equipment.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 61643-41:2025 applies to SPDs for DC power circuits and equipment rated up to 1,500 V DC. IEC 61643-01:2024 contains common SPD requirements used together with the relevant circuit-specific parts of the IEC 61643 series.<sup><a href=\"#ref-3\">[3]<\/a><\/sup><sup><a href=\"#ref-6\">[6]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-engineering\">\r\n    <span class=\"ly-label\">Engineering Meaning<\/span>\r\n    <p>\r\n      A device marked \u201c1,500 VDC\u201d is not automatically suitable for a PCS battery input. Its declared application, continuous operating voltage, DC topology, protection modes, fault-current capability and disconnection method must be verified.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>Battery DC is not automatically the same as PV DC<\/h3>\r\n\r\n  <p>\r\n    IEC 61643-31:2018 applies to SPDs connected to the DC side of photovoltaic installations. IEC 61643-41:2025 addresses SPDs for non-PV DC low-voltage power systems.<sup><a href=\"#ref-6\">[6]<\/a><\/sup><sup><a href=\"#ref-7\">[7]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    A PV SPD should not be approved for a battery-side PCS interface merely because its voltage rating appears suitable. The manufacturer must declare the exact product suitable for the intended battery DC circuit and connection arrangement.\r\n  <\/p>\r\n\r\n  <h3>PCS DC-input data to confirm<\/h3>\r\n\r\n  <ul>\r\n    <li>maximum DC input voltage, including maximum charging voltage;<\/li>\r\n    <li>normal PCS operating range;<\/li>\r\n    <li>voltage from each pole to earth;<\/li>\r\n    <li>floating, grounded, bipolar or midpoint arrangement;<\/li>\r\n    <li>prospective short-circuit current at the PCS terminal;<\/li>\r\n    <li>existing protection inside the battery cabinet and PCS;<\/li>\r\n    <li>required backup fuse, breaker or coordinated disconnector.<\/li>\r\n  <\/ul>\r\n\r\n  <p>\r\n    Uc must remain suitable during normal operation and the defined system conditions. Uc that is too low can increase stress and premature ageing. An unnecessarily high Uc can increase the voltage protection level reaching the PCS.\r\n  <\/p>\r\n\r\n  <h3>Battery cabinet protection and PCS input protection are different boundaries<\/h3>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Protection point<\/th>\r\n          <th>Main protected area<\/th>\r\n          <th>Project decision<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Protection point\"><strong>Battery cabinet output<\/strong><\/td>\r\n          <td data-label=\"Protected area\">Battery terminals, nearby BMS circuits and outgoing cable<\/td>\r\n          <td data-label=\"Project decision\">Check whether local protection is already included and documented<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Protection point\"><strong>DC combiner or distribution cabinet<\/strong><\/td>\r\n          <td data-label=\"Protected area\">Collection bus, branches and connected cable routes<\/td>\r\n          <td data-label=\"Project decision\">Review the changed fault-current and bonding conditions<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Protection point\"><strong>PCS DC input<\/strong><\/td>\r\n          <td data-label=\"Protected area\">PCS input terminals and nearby power electronics<\/td>\r\n          <td data-label=\"Project decision\">Check residual voltage, local induction and coordination with remote SPDs<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    Where the battery and PCS share one compact bonded enclosure, one coordinated arrangement may be sufficient. Where they are separated by external cables, different containers or exposed routes, both ends should be evaluated.\r\n  <\/p>\r\n\r\n  <p>\r\n    There is no universal cable-distance threshold for every BESS architecture. The decision must follow the actual protection zones, cable route, induced-voltage risk, equipment withstand level and project coordination study.<sup><a href=\"#ref-10\">[10]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-risk\">\r\n    <span class=\"ly-label\">High-Risk Mistake<\/span>\r\n    <p>\r\n      Do not install an AC-only SPD on a battery DC bus unless the exact product and connection mode are explicitly rated for that DC application. DC fault interruption and disconnection conditions must be addressed by the declared product design.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <p>\r\n    For detailed selection across the complete battery-side system, use the separate <a href=\"https:\/\/www.cnspd.com\/bess-dc-spd\/\">BESS DC SPD guide<\/a>. This page remains focused on the PCS input interface.\r\n  <\/p>\r\n\r\n  <h2 id=\"pcs-internal-spd\"><span class=\"ez-toc-section\" id=\"is-the-spd-inside-the-pcs-enough\"><\/span>Is the SPD Inside the PCS Enough?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Some PCS products contain an internal AC SPD, DC SPD, PCB-level suppressor or another overvoltage-limiting component. This can protect a defined internal circuit, but it does not automatically prove that every external cable and remote cabinet is protected.\r\n  <\/p>\r\n\r\n  <p>\r\n    Internal protection may not cover:\r\n  <\/p>\r\n\r\n  <ul>\r\n    <li>a remote battery cabinet;<\/li>\r\n    <li>a long inter-container DC cable;<\/li>\r\n    <li>the main AC service or upstream switchboard;<\/li>\r\n    <li>a separately supplied auxiliary circuit;<\/li>\r\n    <li>communication lines entering from another cabinet or building;<\/li>\r\n    <li>surges induced outside the internal device\u2019s coordination boundary.<\/li>\r\n  <\/ul>\r\n\r\n  <section class=\"ly-checklist\">\r\n    <span class=\"ly-label\">Internal SPD Verification<\/span>\r\n    <h2><span class=\"ez-toc-section\" id=\"confirm-these-items-before-removing-external-protection\"><\/span>Confirm These Items Before Removing External Protection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ly-check-grid\">\r\n      <div class=\"ly-check-item\">Exact protected PCS interface<\/div>\r\n      <div class=\"ly-check-item\">Product standard and test class<\/div>\r\n      <div class=\"ly-check-item\">Uc or MCOV<\/div>\r\n      <div class=\"ly-check-item\">Up or voltage protection level<\/div>\r\n      <div class=\"ly-check-item\">In, Imax or Iimp where applicable<\/div>\r\n      <div class=\"ly-check-item\">Protection modes<\/div>\r\n      <div class=\"ly-check-item\">Short-circuit rating<\/div>\r\n      <div class=\"ly-check-item\">Backup fuse or breaker<\/div>\r\n      <div class=\"ly-check-item\">Permitted grounding arrangements<\/div>\r\n      <div class=\"ly-check-item\">Remote alarm contact<\/div>\r\n      <div class=\"ly-check-item\">Replaceable or fixed construction<\/div>\r\n      <div class=\"ly-check-item\">Coordination instructions<\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <p>\r\n    A brochure statement such as \u201csurge protection included\u201d is not enough for project approval. Request the PCS circuit diagram, component schedule, SPD datasheet or technical manual.\r\n  <\/p>\r\n\r\n  <div class=\"ly-callout\">\r\n    <span class=\"ly-label\">Buyer Meaning<\/span>\r\n    <p>\r\n      External SPD removal should be supported by documented coordination. It should not be based only on a product feature icon or an assumption that internal protection covers the complete BESS.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2 id=\"pcs-communication\"><span class=\"ez-toc-section\" id=\"protect-communication-and-auxiliary-interfaces\"><\/span>Protect Communication and Auxiliary Interfaces<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A PCS can remain undamaged on its main power stage but still become unavailable because a communication port, controller input or auxiliary power supply has failed.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 61643-21:2025 applies to SPDs connected to telecommunications and signalling networks. It also covers networks that provide power and data on the same conductors, including PoE applications. IEC 61643-22:2015 provides selection and application principles for these networks.<sup><a href=\"#ref-8\">[8]<\/a><\/sup><sup><a href=\"#ref-9\">[9]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>PCS interface<\/th>\r\n          <th>Selection checks<\/th>\r\n          <th>Typical boundary to review<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"PCS interface\"><strong>RS485 \/ Modbus<\/strong><\/td>\r\n          <td data-label=\"Selection checks\">Working voltage, common-mode voltage, data rate, capacitance and shielding<\/td>\r\n          <td data-label=\"Boundary to review\">Cable leaving the cabinet, container or building<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"PCS interface\"><strong>CAN bus<\/strong><\/td>\r\n          <td data-label=\"Selection checks\">CAN voltage, transmission rate, topology and line balance<\/td>\r\n          <td data-label=\"Boundary to review\">Connection between PCS and remote battery controller<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"PCS interface\"><strong>Ethernet \/ PoE<\/strong><\/td>\r\n          <td data-label=\"Selection checks\">Network speed, PoE standard, cable category, connector and shield<\/td>\r\n          <td data-label=\"Boundary to review\">Copper link between cabinets, containers or buildings<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"PCS interface\"><strong>Digital I\/O and dry contacts<\/strong><\/td>\r\n          <td data-label=\"Selection checks\">Circuit voltage, current, signal behaviour and controller withstand<\/td>\r\n          <td data-label=\"Boundary to review\">External alarms, emergency circuits and remote contacts<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"PCS interface\"><strong>24 VDC \/ 48 VDC auxiliary power<\/strong><\/td>\r\n          <td data-label=\"Selection checks\">Maximum supply voltage, source, load withstand and grounding<\/td>\r\n          <td data-label=\"Boundary to review\">External PLC, HMI, gateway or sensor supply<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    An RS485 SPD is not automatically suitable for CAN. A battery-bus SPD is not suitable for a 24 V controller merely because both circuits are DC. Each interface requires its own voltage and signal review.\r\n  <\/p>\r\n\r\n  <p>\r\n    Use the dedicated <a href=\"https:\/\/www.cnspd.com\/modbus-surge-protection\/\">Modbus surge protection guide<\/a> and <a href=\"https:\/\/www.cnspd.com\/rj45-surge-protector-selection\/\">RJ45 surge protector selection guide<\/a> when protocol-level model selection is required.\r\n  <\/p>\r\n\r\n  <p>\r\n    Optical fibre does not conduct a surge through the fibre itself. However, the media converter, power supply, metallic armour and nearby copper connections may still require protection.\r\n  <\/p>\r\n\r\n  <h2 id=\"pcs-grounding\"><span class=\"ez-toc-section\" id=\"grounding-bonding-and-installation-position\"><\/span>Grounding, Bonding and Installation Position<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    An SPD limits voltage through its complete connection path. Long or looped conductors add inductive voltage during a fast transient and can reduce the effective protection at the PCS terminal.\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 62305-4:2024 provides requirements for the design, installation, inspection, maintenance and testing of surge protection measures for electrical and electronic systems within structures.<sup><a href=\"#ref-10\">[10]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <h3>Install close to the intended boundary<\/h3>\r\n\r\n  <p>\r\n    Place the SPD near the cable entry, bus connection or equipment terminal that defines the intended protection boundary. Follow the PCS and SPD manufacturers\u2019 instructions for the exact mounting position.\r\n  <\/p>\r\n\r\n  <h3>Keep connections short and direct<\/h3>\r\n\r\n  <p>\r\n    Avoid unnecessary loops and detours. Route the SPD connections to the protected conductors and bonding point as directly as practical.\r\n  <\/p>\r\n\r\n  <h3>Integrate all cabinets into the bonding design<\/h3>\r\n\r\n  <p>\r\n    Battery cabinets, PCS enclosures, AC switchboards, communication cabinets, cable screens and metallic containers should be included in the project equipotential-bonding design.\r\n  <\/p>\r\n\r\n  <p>\r\n    An SPD cannot compensate for a missing or poorly designed protective-earth and bonding system.\r\n  <\/p>\r\n\r\n  <h3>Review power and signal entries together<\/h3>\r\n\r\n  <p>\r\n    AC, DC and communication cables often follow different routes. Protecting the power entries while leaving an externally routed RS485 or Ethernet cable unreviewed can leave another surge path into the PCS controller.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <span class=\"ly-label\">Installation Boundary<\/span>\r\n    <p>\r\n      Exact conductor length, cross-section, separation, backup protection and connection method must follow the applicable installation rules, PCS manual, SPD instructions and approved project drawings.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2 id=\"pcs-selection-process\"><span class=\"ez-toc-section\" id=\"a-practical-pcs-spd-selection-process\"><\/span>A Practical PCS SPD Selection Process<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-steps\">\r\n    <section class=\"ly-step\">\r\n      <h3>Map every conductive interface<\/h3>\r\n      <p>\r\n        List the main DC input, AC connection, auxiliary supplies, RS485, CAN, Ethernet, dry contacts, sensors and emergency circuits. Identify which cables leave the bonded enclosure.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-step\">\r\n      <h3>Record the actual operating limits<\/h3>\r\n      <p>\r\n        Obtain the maximum DC voltage, AC voltage, pole-to-earth voltage, auxiliary voltage, signal voltage and equipment impulse-withstand information.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-step\">\r\n      <h3>Confirm earthing and grounding<\/h3>\r\n      <p>\r\n        Identify the AC earthing system, DC grounding topology, insulation-monitoring arrangement, cable-shield method and equipotential-bonding structure.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-step\">\r\n      <h3>Identify surge exposure and boundaries<\/h3>\r\n      <p>\r\n        Review the external LPS, outdoor routes, container separation, cable length and existing upstream or downstream SPDs.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-step\">\r\n      <h3>Check surge and fault coordination<\/h3>\r\n      <p>\r\n        Verify Uc or MCOV, Up, surge test class, protection modes, prospective fault current, backup device and coordination with other SPDs.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-step\">\r\n      <h3>Complete technical approval<\/h3>\r\n      <p>\r\n        Compare the proposed models and wiring with the PCS manual, EPC single-line diagram, applicable standards and project specification before ordering.\r\n      <\/p>\r\n    <\/section>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/pcs-spd-project-review-oem-approval-workflow.webp\"\r\n      alt=\"PCS surge protection project review and OEM approval workflow for BESS systems\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      A PCS SPD review should begin with interface data and finish with an exact model, backup device, installation drawing and document check.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2 id=\"pcs-project-layouts\"><span class=\"ez-toc-section\" id=\"how-the-protection-logic-changes-by-bess-layout\"><\/span>How the Protection Logic Changes by BESS Layout<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-decision-grid\">\r\n    <section class=\"ly-decision\">\r\n      <h3>Battery and PCS in One Container<\/h3>\r\n      <p>\r\n        Internal power routes may be short and remain within one bonded enclosure. Verify the protection already installed at each external entry before adding duplicate devices.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-decision\">\r\n      <h3>Separate Battery and PCS Containers<\/h3>\r\n      <p>\r\n        External DC and communication cables create separate boundaries. Review both cable ends, route exposure, bonding and coordination between local SPDs.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-decision\">\r\n      <h3>Utility-Scale PCS with Transformer<\/h3>\r\n      <p>\r\n        Review the PCS low-voltage AC terminal, transformer arrangement, main switchgear, available fault current, upstream protection and lightning-risk design.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-decision\">\r\n      <h3>Hybrid PV and BESS Project<\/h3>\r\n      <p>\r\n        Keep PV strings, battery DC circuits and converter interfaces clearly separated. Do not treat every 1,500 VDC circuit as the same SPD application.\r\n      <\/p>\r\n    <\/section>\r\n  <\/div>\r\n\r\n  <p>\r\n    IEC 62933-5-1:2024 provides general safety considerations for grid-integrated electrical energy storage systems. IEC 62933-5-2:2025 adds safety requirements for electrochemical energy storage systems across their life cycle.<sup><a href=\"#ref-11\">[11]<\/a><\/sup><sup><a href=\"#ref-12\">[12]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    These standards establish the wider BESS safety context. The exact SPD must still be selected using the relevant AC, DC or signal product standard and the approved project design.\r\n  <\/p>\r\n\r\n  <h2 id=\"pcs-mistakes\"><span class=\"ez-toc-section\" id=\"common-pcs-surge-protection-mistakes\"><\/span>Common PCS Surge Protection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Mistake<\/th>\r\n          <th>Why it creates risk<\/th>\r\n          <th>Better project practice<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Selecting from PCS power only<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">MW or kW does not define voltage, fault current, grounding or exposure<\/td>\r\n          <td data-label=\"Better practice\">Collect interface-specific electrical data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Using one SPD category everywhere<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">AC, battery DC and communication circuits have different conditions<\/td>\r\n          <td data-label=\"Better practice\">Select each interface separately<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Treating battery DC as PV DC automatically<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">Application scope, source behaviour and fault conditions can differ<\/td>\r\n          <td data-label=\"Better practice\">Verify the declared BESS DC application<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Assuming the internal SPD covers everything<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">The internal device may protect only one circuit or terminal<\/td>\r\n          <td data-label=\"Better practice\">Request the circuit diagram and component data<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Protecting only power lines<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">A communication or auxiliary transient can disable the controller<\/td>\r\n          <td data-label=\"Better practice\">Review every externally routed conductor<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Ignoring prospective fault current<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">The SPD or backup device may not safely clear a fault<\/td>\r\n          <td data-label=\"Better practice\">Verify SCCR or Isccr and backup protection<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Mistake\"><strong>Using long SPD connections<\/strong><\/td>\r\n          <td data-label=\"Why it creates risk\">Connection inductance increases the voltage reaching the PCS<\/td>\r\n          <td data-label=\"Better practice\">Use short, direct connections and proper bonding<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2 id=\"pcs-ordering\"><span class=\"ez-toc-section\" id=\"information-required-before-a-pcs-spd-order\"><\/span>Information Required Before a PCS SPD Order<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful recommendation requires more than \u201cBESS PCS\u201d or \u201c1,500 V inverter.\u201d Prepare the following data before requesting a quotation, sample or OEM configuration.\r\n  <\/p>\r\n\r\n  <section class=\"ly-evidence\">\r\n    <span class=\"ly-label\">Project Evidence<\/span>\r\n    <h3>Documents to Verify Before Model Approval<\/h3>\r\n\r\n    <ul>\r\n      <li>PCS datasheet and interface schedule;<\/li>\r\n      <li>AC and DC single-line diagrams;<\/li>\r\n      <li>internal SPD or surge-protection component details;<\/li>\r\n      <li>prospective AC and DC fault-current calculations;<\/li>\r\n      <li>SPD datasheet and installation instructions;<\/li>\r\n      <li>model-specific certificate or test-report scope;<\/li>\r\n      <li>backup fuse or breaker coordination table;<\/li>\r\n      <li>approved cabinet layout and wiring drawing.<\/li>\r\n    <\/ul>\r\n\r\n    <p>\r\n      A certificate for one model does not automatically cover every voltage, pole arrangement or module in the same product family. Match the model marking, report scope and project configuration.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ly-checklist\">\r\n    <span class=\"ly-label\">OEM and Project Checklist<\/span>\r\n    <h2><span class=\"ez-toc-section\" id=\"send-these-parameters-to-the-spd-supplier\"><\/span>Send These Parameters to the SPD Supplier<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ly-check-grid\">\r\n      <div class=\"ly-check-item\">PCS manufacturer and model<\/div>\r\n      <div class=\"ly-check-item\">PCS rated power<\/div>\r\n      <div class=\"ly-check-item\">Maximum DC input voltage<\/div>\r\n      <div class=\"ly-check-item\">Normal DC operating range<\/div>\r\n      <div class=\"ly-check-item\">DC grounding topology<\/div>\r\n      <div class=\"ly-check-item\">Pole-to-earth voltage<\/div>\r\n      <div class=\"ly-check-item\">Prospective DC fault current<\/div>\r\n      <div class=\"ly-check-item\">Battery-to-PCS cable route<\/div>\r\n      <div class=\"ly-check-item\">AC voltage and frequency<\/div>\r\n      <div class=\"ly-check-item\">AC earthing system<\/div>\r\n      <div class=\"ly-check-item\">Prospective AC fault current<\/div>\r\n      <div class=\"ly-check-item\">Transformer and PCC arrangement<\/div>\r\n      <div class=\"ly-check-item\">External LPS information<\/div>\r\n      <div class=\"ly-check-item\">Existing upstream SPDs<\/div>\r\n      <div class=\"ly-check-item\">Internal PCS protection data<\/div>\r\n      <div class=\"ly-check-item\">RS485, CAN and Ethernet details<\/div>\r\n      <div class=\"ly-check-item\">Auxiliary AC or DC supply<\/div>\r\n      <div class=\"ly-check-item\">Remote alarm requirement<\/div>\r\n      <div class=\"ly-check-item\">Required IEC, EN or UL standard<\/div>\r\n      <div class=\"ly-check-item\">Certificate and report scope<\/div>\r\n      <div class=\"ly-check-item\">DIN-rail and wiring space<\/div>\r\n      <div class=\"ly-check-item\">Quantity and project schedule<\/div>\r\n      <div class=\"ly-check-item\">OEM label requirement<\/div>\r\n      <div class=\"ly-check-item\">Packaging and document needs<\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <p>\r\n    LEEYEE can use these details to prepare a model shortlist and identify conditions that still require confirmation by the PCS manufacturer, system integrator or EPC.\r\n  <\/p>\r\n\r\n  <p>\r\n    CNSPD is LEEYEE\u2019s surge protection-focused platform for global technical buyers. Final project approval remains subject to the PCS documentation, applicable standards and responsible engineering review.\r\n  <\/p>\r\n\r\n  <section class=\"ly-cta\">\r\n    <span class=\"ly-label\">Technical Configuration Review<\/span>\r\n    <h2><span class=\"ez-toc-section\" id=\"share-your-pcs-interface-requirements\"><\/span>Share Your PCS Interface Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Send the PCS datasheet, DC voltage range, AC single-line diagram, cable routes, communication interfaces, prospective fault currents and required project standard.\r\n    <\/p>\r\n\r\n    <p>\r\n      LEEYEE can review the AC, battery DC, signal, Ethernet, backup-protection and remote-alarm requirements before an OEM model or project sample is confirmed.\r\n    <\/p>\r\n\r\n    <div class=\"ly-cta-actions\">\r\n      <a href=\"javascript:void(0);\" class=\"leeyee-site-popup-btn\"><span>Send Your PCS Requirement<\/span><\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <h2 id=\"pcs-faq\"><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-faq\">\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Does every BESS PCS need an SPD on both the AC and DC side?<\/h3>\r\n      <p>\r\n        Both interfaces should be assessed, but the final number and position of SPDs depend on the internal PCS protection, cable routing, upstream protection, lightning exposure, earthing, bonding and project specification.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Can a PV DC SPD be used at the battery input of a PCS?<\/h3>\r\n      <p>\r\n        Do not assume suitability from the voltage rating alone. Verify that the exact product is declared for the battery DC application, topology, fault current and required disconnection method.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Is a Type 2 SPD enough for the PCS AC side?<\/h3>\r\n      <p>\r\n        It may be appropriate at some local equipment or distribution positions, but it is not a universal answer. The required SPD Type depends on the installation boundary, LPS, upstream protection and applicable project rules.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Should an SPD be installed at both the battery cabinet and PCS?<\/h3>\r\n      <p>\r\n        Evaluate both ends when the equipment is separated by external or exposed cables, or when the ends form different protection boundaries. A compact system inside one bonded enclosure may use a different coordinated arrangement.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Does PCS power determine the SPD surge-current rating?<\/h3>\r\n      <p>\r\n        No. PCS power and SPD surge-current capability describe different conditions. SPD selection depends on surge exposure, installation position, test class, coordination and project risk.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Can the PCS internal SPD replace all external SPDs?<\/h3>\r\n      <p>\r\n        This cannot be concluded without documentation. Confirm which interface the internal device protects, its ratings, connection mode, coordination limits and whether remote equipment remains outside its protection boundary.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Does a fibre communication link need a signal SPD?<\/h3>\r\n      <p>\r\n        The optical fibre itself does not conduct a surge. The associated power supply, media converter, metallic armour, Ethernet patch cable and other conductive connections still need to be reviewed.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>What information is most important for a PCS DC SPD quotation?<\/h3>\r\n      <p>\r\n        Provide the maximum DC voltage, operating range, grounding arrangement, pole-to-earth voltage, prospective fault current, cable route, installation position and existing protection.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <section class=\"ly-faq-item\">\r\n      <h3>Should a signal SPD be selected only by protocol name?<\/h3>\r\n      <p>\r\n        No. Protocol name alone is insufficient. Confirm the working voltage, common-mode voltage, data rate, capacitance, connector, shielding and grounding arrangement.\r\n      <\/p>\r\n    <\/section>\r\n  <\/div>\r\n\r\n  <section class=\"ly-related\">\r\n    <h2><span class=\"ez-toc-section\" id=\"related-technical-guides\"><\/span>Related Technical Guides<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ul>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/bess-surge-protection\/\">BESS surge protection architecture for the complete energy storage system<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/bess-dc-spd\/\">BESS DC SPD selection for battery cabinets and DC interfaces<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-sccr-rating\/\">SPD SCCR and Isccr project confirmation<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/modbus-surge-protection\/\">Modbus and RS485 surge protection<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/rj45-surge-protector-selection\/\">RJ45 and Ethernet surge protector selection<\/a><\/li>\r\n      <li><a href=\"https:\/\/www.cnspd.com\/spd-remote-alarm-plc\/\">SPD remote alarm connection to PLC and monitoring systems<\/a><\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <section class=\"ly-references\" id=\"references\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <ol>\r\n      <li id=\"ref-1\">\r\n        International Electrotechnical Commission, <em>IEC 62909-1:2025, Bi-directional grid-connected power converters \u2014 Part 1: General and safety requirements<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/69114\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-2\">\r\n        International Electrotechnical Commission, <em>IEC 62477-1:2022, Safety requirements for power electronic converter systems and equipment \u2014 Part 1: General<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/28936\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-3\">\r\n        International Electrotechnical Commission, <em>IEC 61643-01:2024, Low-voltage surge protective devices \u2014 Part 01: General requirements<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-4\">\r\n        International Electrotechnical Commission, <em>IEC 61643-11:2025, Low-voltage surge protective devices \u2014 Part 11: Surge protective devices connected to AC low-voltage power systems \u2014 Requirements and test methods<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-5\">\r\n        International Electrotechnical Commission, <em>IEC 61643-12:2020, Low-voltage surge protective devices \u2014 Part 12: Surge protective devices connected to low-voltage power systems \u2014 Selection and application principles<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/32531\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-6\">\r\n        International Electrotechnical Commission, <em>IEC 61643-41:2025, Low-voltage surge protective devices \u2014 Part 41: Surge protective devices connected to DC low-voltage power systems \u2014 Requirements and test methods<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/27917\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-7\">\r\n        International Electrotechnical Commission, <em>IEC 61643-31:2018, Low-voltage surge protective devices \u2014 Part 31: Requirements and test methods for SPDs for photovoltaic installations<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/26931\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-8\">\r\n        International Electrotechnical Commission, <em>IEC 61643-21:2025, Low-voltage surge protective devices \u2014 Part 21: Surge protective devices connected to telecommunications and signalling networks \u2014 Requirements and test methods<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/69085\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-9\">\r\n        International Electrotechnical Commission, <em>IEC 61643-22:2015, Low-voltage surge protective devices \u2014 Part 22: Surge protective devices connected to telecommunications and signalling networks \u2014 Selection and application principles<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/22772\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-10\">\r\n        International Electrotechnical Commission, <em>IEC 62305-4:2024, Protection against lightning \u2014 Part 4: Electrical and electronic systems within structures<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-11\">\r\n        International Electrotechnical Commission, <em>IEC 62933-5-1:2024, Electrical energy storage systems \u2014 Part 5-1: Safety considerations for grid-integrated EES systems \u2014 General specification<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/72239\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-12\">\r\n        International Electrotechnical Commission, <em>IEC 62933-5-2:2025, Electrical energy storage systems \u2014 Part 5-2: Safety requirements for grid-integrated EES systems \u2014 Electrochemical-based systems<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/68297\" target=\"_blank\" rel=\"nofollow noopener\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-13\">\r\n        ABB, <em>Switching &amp; Protection of 1500 V DC Bus in Power Conversion Systems<\/em>, application note addressing PCS used in PV, BESS and hydrogen applications.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/df0a8c19f2634cf5b895f554451244c0\/9AKK108470A3850_Switching%26Protection_1500VDC_Bus_PCS_2025_01.pdf\" target=\"_blank\" rel=\"nofollow noopener\">Official ABB application note<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n<\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>A BESS power conversion system connects the battery-side DC circuit to an AC switchboard, transformer, grid or local load. The same PCS may also connect to a BMS, EMS, SCADA platform, auxiliary supply and several communication networks. Each conductive interface can become a surge entry path. PCS inverter surge protection should therefore be reviewed as&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-30400","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PCS Inverter Surge Protection for BESS | AC, DC &amp; Signal SPD<\/title>\n<meta name=\"description\" content=\"Learn how to protect BESS PCS inverter AC, DC, communication and auxiliary interfaces, including SPD locations, grounding, coordination and OEM data.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PCS Inverter Surge Protection for BESS | AC, DC &amp; Signal SPD\" \/>\n<meta property=\"og:description\" content=\"Learn how to protect BESS PCS inverter AC, DC, communication and auxiliary interfaces, including SPD locations, grounding, coordination and OEM data.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/it\/pcs-inverter-surge-protection\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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