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Release notes

This page tracks documentation changes between versions of the C-Battery Technical Wiki. For the current docs see v2.0. Older versions remain accessible via the version switcher.

v2.0 — 2026-05-22​

A new rack software version is available. Changes versus v1:

75 kWh rack​

  • Stability fixes — increase operational uptime.
  • Lower self-consumption — to reduce operational energy cost, the rack now drops into InvSt = 7 (Standby) whenever the EMS writes WSet = 0 (40301–40302). Writing any non-zero WSet (e.g. 5 000 W) returns it to Running immediately. The state transition is driven entirely by the value of WSet — no separate state command from the EMS. See Integration guide → Control flow.
  • Rack fault reset over Modbus — EMS can now clear active rack errors by writing 1 to register 40427 per rack. The register self-clears to 0 once the reset has been applied. See Integration guide → Resetting rack faults.
  • Total battery DC voltage exposed — Model 802 now publishes V (total battery DC voltage) at register 40441. See Integration guide → Model 802.

v1 — initial release​

First published version of the wiki, covering:

  • 75 kWh rack — integration guide and register reference.
  • Other systems — integration guide and register reference for non-75 kWh deployments.