Cloudy weather - are my two PV 200S emptying my B300?

Over night and ongoing cloudy sky my B300 lost about 10% - what has a newcomer to do?

Was the unit turned on? Just being turned on will run the unit down slowly, even if it’s not charging anything.

Hi @Claus , At night when there is no solar power B300 will have self-consumption if it is still on. And the weather condition is not good, how much solar input is there?
We suggest you test it for a few more days, and turn on the B300 for PV charging only during the day.