I have a multiplus II. I installed it in my RV with 300 Ah of Battleborn batteries. After install I used the inverter at my home on a 15amp circuit and ran the RV through a weeks worth of charges and discharges successfully. Had it pulling from shore and batteries, just shore, and just batteries. Got multiple deep discharges and recharges to ensure system operating well. By the way, I did adjust the settings of the multiplus to match the recommendations of Battleborn for charging.
After we went on our first trip I plugged into a 30amp circuit, adjusted the input settings to 30amp and I after getting to my next destination it doesn't seem it actually charged. Batteries had just 3% left in them.
Realizing these we plugged in to a 15amp circuit and immediately tripped the breaker. I ran my generator and got a few minutes of charge and then stopped receiving AC in.
Not sure what the problem is on this. Any leads would be greatly appreciated! Let me know what questions you have so I can help assist.