Great news! Overnight, the batteries charged and are now at 12.2 volts. Everything works as it should—lights, TV, stereo, and so on. It’s not connected to shore power. My new theory is that the 12-volt batteries supply power to all those items and charge properly when sunlight or solar power is available. When plugged into shore power, the 120-volt power will power the fridge, microwave, heater, and air conditioner. However, the other items continue to draw power from the 12-volt batteries and don’t switch over to the 120-volt power source and ultimately drain the batteries. Looking st the owner’s manual there should be 3-25 amp fuses, looking at the panel there are 2-30 amp fuses and one empty slot (see photo).
Any thoughts?
Thank you
Ron