2017 Seneca Electrical

[Oma/opa]

Day before yesterday morning I noticed that my house batteries were down to 10.7V. The MH had been unplugged from shore power for about a week. I connected the shore power to charge the batteries and they came up to 13.2V after about 9 hours. Unplugged the shore power again and by the the next morning the charge was down to 11.9. Possible parasitic drain? I plugged the shore power back in and charged the batteries again up to 13V. This time I disconnected the shore power and turned the coach battery switch OFF. After 10 hours today the charge is down to 12.3V but then I noticed the clock on the Microwave was working so I turned the microwave on and it ran. How can I have 120V to the microwave when shore power is disconnected and the battery switch is OFF.
I'm no electrical wizard so try to answer in simple terms.

[Grumpy]

LP detector, possibly Carbon monoxide detector and turn off Inverter, it is not on battery disconnect.

[Robbbyr]

Grumpy is spot on, your inverter is on. If you are unplugged and are not running the generator, but yet your microwave works, you are making your own 120-volt AC from your batteries! Plus with the inverter on you are also feeding power to your TVs which draw some current even when turned off.

[oldmanAZ]

Before you need to rely on your house batteries, consider pulling them out and having them tested. They could be bad after one, and possibly more, total discharges.

[Oma/opa]

Got a lot to learn about this Seneca. Things have gotten complicated compared to my old 2003 class C
Thanks for the replies