I have a Cyrix connecting my starter battery (MB Sprinter) to the house battery and have a BMV712.
I use an AC charger to top up the house battery before a trip
Battery reads 13v +
During trip main load is fridge 6a @ 12v
The battery voltage as expected goes down over the trip
however when driving the battery is not charged and BMV shows 100% SOC always !!!!
TESTING - output of Cyrix is 13v+ - shunt seems to not allowing charge to get to battery