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Victron Energy Modbus register maps

Updated 24 October 2026

1 Victron Energy model, 128 registers in all, each re-typed from Victron Energy’s own free documentation and checked against it.

• Battery inverter (GX gateway for inverter/chargers, batteries and solar chargers)

  Victron Energy GX device Modbus-TCP (Cerbo GX, Venus GX, Color Control GX)

  Victron GX devices running Venus OS with the Modbus-TCP service enabled; register list version 3.81 (document Rev 54). Core system, VE.Bus inverter/charger, battery, solar charger and ESS registers only.

  128 registers · 21 writable · TCP
  Also known as: Cerbo GX, Cerbo-S GX, Venus GX, Color Control GX, CCGX, Ekrano GX, Octo GX, MultiPlus-II GX, EasySolar-II GX, Venus OS, dbus-modbustcp

Victron Energy: default communication settings

Factory defaults as the manufacturer documents them. Change one setting at a time on site and write down what you changed. Word order applies to 32-bit values; the addressing column says how the manufacturer prints register numbers (every map on this site also gives the 0-based wire address).