Gx Device - Victron energy VE.Bus BMS V2 Product Manual

3.5. GX device

For solar chargers, Inverter RS, Multi RS or Multis to be controlled by the BMS via a GX device, the following requirements
should be met:
• The GX device Venus OS firmware must be version 2.80 or above.
Installation:
1. Connect the GX device VE.Bus port to the Remote panel port on the BMS via an RJ45 cable (not included). Note that this is
different from the former VE.Bus BMS V1, which allowed only the connection of a Digital Multi Control. The VE.Bus BMS V2
allows to connect a GX device, a VE.Bus Smart dongle or a Digital Multi Control.
2. Connect the GX device "power +" terminal to the GX-Pow terminal of the BMS and connect the GX device "power -" terminal
to the negative terminal of the battery.
3. Connect the positive wire of an (optional) AC-DC power supply to the AUX-in terminal of the BMS and connect the negative
wire to the negative battery terminal. Note that the AC-DC power supply is optional and most likely not needed in off-grid
installations such as boats or RVs.
4. Perform a VE.Bus re-detect system action on the GX device. This action is available in the inverter/charger menu on the GX
device.
The functionality of the GX-Pow and Aux-In terminals:
• The GX-Pow output supplies GX power from either the battery or from the Aux-In input, whichever voltage is higher.
• An AC-DC adapter (not supplied) or other power supply connected to the Aux-In input ensures that the GX device is also
powered during a low cell state as long as that aux power is available.
The GX device is powered by the GX-Pow terminal. The GX-Pow terminal is normally battery powered via the Battery+ terminal.
In the event of a low cell voltage, this connection would not be available, leaving the GX device without power. However, when
another power supply (i.e. a grid connected AC-DC power supply) is connected to the Aux-In, the GX-Pow connection will
continue to power the GX device, allowing the system to remain accessible despite low cell voltage, for example, to remotely
diagnosis the system.
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VE.Bus BMS V2
GX device connections
Installation