When my solar controller is producing more watts than my camper 12v system is using, the watts listed on the battery is incorrect and the DC power goes negative.
Screen shot of correct normal operation. I believe this screen shot proves I have the shunt wired properly.
S creen shot showing incorrect data:
Here, the solar is producing 84w, but the battery says it is charging at 137w and DC power is showing -53w. If I had another charger hooked up, I could see this being correct, but I do not. It's like the shunt is wired backwards. The problem only happens, (and always happens) when solar is producing more watts then the camper is consuming. As soon as the solar drops below 53w, the numbers are correct again.
Details: I have solar panels on the roof of the camper, wired in series
I have two 12v battleborn 100ah in parallel
I have a victron 100/30 mppt controller
I have a victron 712 battery monitor
My camper lights and refrigerator run on 12v
I am NOT connected to shore power, generator is not running, no other chargers hooked up
I do not have an inverter
Chassis battery positive is isolated from house batteries with libim 225; I have ensured the libim doesn't have the batteries connected
I have verified the load side of shunt is wired to negative load, and battery side wired to negative battery terminals
The ground screw on the solar controller is wired to load side of shunt
the positive output of solar controller is connected to the battery bank (with a fuse), neg output connected to load side of shunt
I have verified that the negative wire from the solar panels, is NOT grounded to chassis
In cerbo, "has dc system" is set to ON
Again, The problem only happens, (and always happens) when solar is producing more watts than the camper is consuming.