Rovnblood posted a similar thread about this: https://tab-rv.vanillacommunity.com/discussion/10725/5-37-amp-phantom-draw#latest
I decided I would start my own thread since I have a 320 with no inverter.
I had issues with the stock battery that came with my tab. It was dying in the middle of the night. So I replaced it with a 100amp battleborn. But the same thing happened on Friday night. I was boondocking and the battery was charging fine all day, but then it just died in the middle of the night, leaving me with no heat.
When I got it home I hooked up an amp meter. I didn't have anything inside the tab turned on. No lights or heating system. But there was a 5 amp draw.
Does anyone know what could draw that much power? That seems like more power then even the refrigerator would pull.