My BMV 712 monitor always reports almost exactly half the amps (either charging or discharging) as reported by my LifeBlue batteries built-in BMS (or my Xantrex inverter when it's operating). Both of these other readings seem correct. It's the Victron which seems wrong.
It doesn't matter whether the charge is coming from the solar or the alternator or whether the load is direct DC or through the AC inverter. As a result, my estimated SOC via the BMV-712 is always well off. My van builder affirms that there are no loads directly connected to the batteries (plus that wouldn't explain why charge current also reads as half). What could be the cause of this?
My system includes the Victron BMV-712 monitor, Victron Smart Battery Protect, two LifeBlue 200Ah LiFePo4 batteries, Red Arc 50 amp DC-DC charger and Xantrex 2000 watt inverter/charger.
I've seen a couple of other threads here reporting a similar issue (half current reported by BMV 712) but they're unresolved:
https://community.victronenergy.com/questions/127381/bmv-712-amp-reading-50-off.html
https://community.victronenergy.com/questions/58020/my-bmv-712-shows-less-amps-in-than-does-my-mppt-ch.html
https://community.victronenergy.com/questions/206917/bmv-shows-half-the-current-that-balmor-shunt-shows.html