First set the correct absorption voltage. The end/absorption voltage needs to match the battery pack to operate correctly. For example: if you have 4 cells and the balance voltage (Vbalance) is 3.4V, the pack balance voltage is 3.4V x 4 cells = 13.6V. You need to configure the charger to an end/absorption voltage a bit higher (about 0.2V) than this voltage which is 13.8V.

Device with remote signal

Many Victron devices have a “remote” or “enable” signal which consists of two wires. As long as the two wires are connected to each other, the device will be enabled. When the signal path is broken, the device will switch to standby mode. This “remote” signal can directly be connected to the SmartBMS signal relay.

For example if you have an inverter with a remote port, you can wire the two remote wires to the Discharge/Load signal relay potential free contacts located on the End Board (last cell board). Use connector pin 1 and 2, which are “allow to charge” and “common contact”.

Victron BlueSolar and SmartSolar MPPT Charge controller

Use the Victron VE.Direct non inverting remote on-off cable, part number ASS030550310. With this cable, you can connect the battery + to pin 2 (common contact) of the Charge signal relay of the SmartBMS.  Connect the Victron yellow remote cable to the SmartBMS Charge contact pin 1 (allow to charge). Also see the Victron document.

Victron without GX or “remote” control

If your Victron device does not have a remote control signal and cannot use the VE.Direct non inverting remote on-off cable, you can still connect a power efficient power relay to the BMS so the BMS can switch off the device in case this is needed. See the manual for a general schematic.