The Original DIY Battery Company
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The Original DIY Battery Company
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Used high-voltage battery stack control enclosure
Used high-voltage battery stack control enclosure
Used high-voltage battery stack control enclosure
Used high-voltage battery stack control enclosure
Battery Hookup

Used high-voltage battery stack control enclosure

$200.00 $0.00

What it actually is

The two silver modules inside are:

  • BMS Stack Controller — the brains. It talks to cell interface modules, calculates SOC/SOH, handles faults, and talks to the outside world.
  • BMS Power Interface — handles high-current contactors, current shunt measurement, stack voltage, and auxiliary power distribution.

Together 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.

Front-panel connections

  • B+ / B– — Battery stack positive and negative.
  • P+ / P– — DC bus / pack output side (after the contactors).
  • COM (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:
    • Ethernet / Modbus TCP
    • RS-485 / Modbus RTU
    • CAN
    • GPIO / interlock / HMI signals

What’s inside (from the photos)

  • Gigavac high-voltage DC contactors (main + pre-charge)
  • High-current fuse (looks like a 350 A class fuse)
  • Current shunt
  • Isolated TOBSUN DC-DC converters (auxiliary 24 V power for the BMS and contactors)
  • Wiring for Link Bus (goes out to separate Cell Interface modules that sit on the actual battery modules)

The Cell Interface boards themselves are not in this box — they live on the battery modules and daisy-chain back to the Stack Controller via the Link Bus.

Communications capabilities

The Stack Controller supports:

  • Modbus TCP over Ethernet (primary interface + web-based Operator Interface)
  • Modbus RTU over isolated RS-485
  • Isolated CAN 2.0
  • USB (configuration / firmware)
  • Configurable GPIO

This is the same comms stack used in commercial utility-scale and C&I energy storage systems. It speaks SunSpec / MESA models so inverters and site controllers can talk to it directly.

Typical use

This style of enclosure is common in:

  • Used / surplus commercial battery energy storage systems (BESS)
  • Custom high-voltage Li-ion or LiFePO4 stacks
  • Second-life EV battery packs that were converted into stationary storage

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