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I have 4 x 100 amp AGM batteries set to charge via a relay and our monitor is the BMV 712 smart. My house battery keeps draining and doesn't seem to charge at all. Is there something I need to program for the relay to charge the battery. What am I missing?
First thing I would do is check connections on the relay are how they are supposed to be. And use a multimeter on it with the engine running/off to see if anything is passing through. That said, AGMs would really benefit from a DC-DC charger to supply them with correct voltage.
@Mollythevan, please confirm which relay you're using, how you have it wired, and the presence, condition, and brand(s) of the fuses or circuit breakers that you have on each end of the relay to protect the wiring; without all the pertinent information it's difficult to provide troubleshooting for the setup. Best regards!
