question

danglin avatar image
danglin asked

Setting up Victron BMV702 relay to switch alternator charging on/off

How might I set up the Victron BMV702 relay to control a battery isolator device (a Battleborn lithium battery isolation manager)? I want to be able to disconnect charging amps from the alternator when the house Battleborn lithium bank reaches a certain voltage during a long drive. I have Victron solar charger and 600 roof watts to finish charging the 300 amp hour bank with more control than the alternator. This is in a Mercedes Sprinter mobile home.

Relay
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1 Answer
boekel avatar image
boekel answered ·

This should work...but...


In a good design you want to set the voltages of the charging sources to a safe level, like the maximum absorbtion voltage. The BMS is only to protect when an anomaly happens, like overvoltage in a cell or (when a charging source is malfunctioning or not set right) complete overvoltage (and undervoltage events, also shouldn't occur).

I strongly advice to get the charging voltage right, I don't know how high it is now and what it is allowed to be, sometime using an old style diode splitter (use both outputs to the battery) is enough to get a voltage drop and stay in the 'safe zone'.

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