[Logan X]

The battery monitor suggested by Mark is an excellent suggestion. I also use the Victron battery monitor and I’m very happy with it. It is extremely helpful to know the exact state of charge of your batteries and how much energy you are using so you know how long you can camp and when you need to recharge.

My guess is that if you haven’t been monitoring the batteries , you may have depleted them too deeply and they may be damaged and not able to hold a charge.