{"product_id":"used-high-voltage-battery-stack-control-enclosure","title":"Used high-voltage battery stack control enclosure","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eWhat it actually is\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe two silver modules inside are:\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMS Stack Controller\u003c\/strong\u003e — the brains. It talks to cell interface modules, calculates SOC\/SOH, handles faults, and talks to the outside world.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMS Power Interface\u003c\/strong\u003e — handles high-current contactors, current shunt measurement, stack voltage, and auxiliary power distribution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eTogether they form a single-stack high-voltage BMS (G4 generation, typically rated up to 1250 V DC). The rest of the box is the power hardware that the BMS controls.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eFront-panel connections\u003c\/h3\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eB+ \/ B–\u003c\/strong\u003e — Battery stack positive and negative.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eP+ \/ P–\u003c\/strong\u003e — DC bus \/ pack output side (after the contactors).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCOM\u003c\/strong\u003e (three circular connectors) — Custom-wired communication and control ports. The handwritten labels (“OUT 1”, “HMI 2”, “#3 33A”) are integrator markings. These usually carry a mix of:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eEthernet \/ Modbus TCP\u003c\/li\u003e\n\u003cli\u003eRS-485 \/ Modbus RTU\u003c\/li\u003e\n\u003cli\u003eCAN\u003c\/li\u003e\n\u003cli\u003eGPIO \/ interlock \/ HMI signals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"auto\"\u003eWhat’s inside (from the photos)\u003c\/h3\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eGigavac high-voltage DC contactors (main + pre-charge)\u003c\/li\u003e\n\u003cli\u003eHigh-current fuse (looks like a 350 A class fuse)\u003c\/li\u003e\n\u003cli\u003eCurrent shunt\u003c\/li\u003e\n\u003cli\u003eIsolated TOBSUN DC-DC converters (auxiliary 24 V power for the BMS and contactors)\u003c\/li\u003e\n\u003cli\u003eWiring for Link Bus (goes out to separate Cell Interface modules that sit on the actual battery modules)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThe Cell Interface boards themselves are \u003cstrong\u003enot\u003c\/strong\u003e in this box — they live on the battery modules and daisy-chain back to the Stack Controller via the Link Bus.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eCommunications capabilities\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe Stack Controller supports:\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eModbus TCP\u003c\/strong\u003e over Ethernet (primary interface + web-based Operator Interface)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModbus RTU\u003c\/strong\u003e over isolated RS-485\u003c\/li\u003e\n\u003cli\u003eIsolated \u003cstrong\u003eCAN 2.0\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUSB (configuration \/ firmware)\u003c\/li\u003e\n\u003cli\u003eConfigurable GPIO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThis is the same comms stack used in commercial utility-scale and C\u0026amp;I energy storage systems. It speaks SunSpec \/ MESA models so inverters and site controllers can talk to it directly.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eTypical use\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThis style of enclosure is common in:\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eUsed \/ surplus commercial battery energy storage systems (BESS)\u003c\/li\u003e\n\u003cli\u003eCustom high-voltage Li-ion or LiFePO4 stacks\u003c\/li\u003e\n\u003cli\u003eSecond-life EV battery packs that were converted into stationary storage\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Battery Hookup","offers":[{"title":"Default Title","offer_id":47596015485090,"sku":"High Voltage Battery Stack Control","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2398\/3077\/files\/0_3b1a9b49-ea56-4a0a-9586-c492ee2d1646.jpg?v=1787922701","url":"https:\/\/batteryhookup.com\/products\/used-high-voltage-battery-stack-control-enclosure","provider":"Battery Hookup","version":"1.0","type":"link"}