Check the output of the B300 battery connection while disconnected from the AC200. You might find voltage there even without the B300 turned off. On the B230 there is 14 volts on the output pins of the battery connection when power is off…
That’s exactly what it is. ~34 volts coming from the B300. That’s disappointing. That’s about the same amount of power my large ICECO uses. I’m more curious now about how much overhead there is while the DC is actually on as well as the AC200 overhead on its AC/DC. I’ve got the maximum amount of solar coming in, so it’s not a “problem”.
Correction: B300 has ~13 volts at terminals when turned off.
When turned off, B300 doesn’t lose power.
When turned on and not connected to anything it still loses 1% per hour.
What ever is causing the drain is in the B300.
Perhaps BMS uses ~30wh. Is that normal? It seems high considering a fridge uses about the same amount of power.