Tank monitor/Water heater/water pump issue

Well, after digging a little deeper, looks like everything is actually in working order. Battery terminals were loose. So I tightened those down... then realized the breaker inline with the 12v wire was tripped. Reset that. After being all connected properly and hooked up to shore power for a day, battery tested 13.8v and the panel worked. Don't know if the battery will hold a charge yet... will be testing that out in coming weeks. Going to hook up a power inverter to it so I can run my residential fridge while in tow. Will disconnect shore power when I get the inverter set up and see how long the battery runs the inverter for. If we can't get a good run, at least a couple of hours, then I'll look into upgrading the battery. I'm hoping to get at least 5-6 hours of inverter/fridge run time while in tow. Maybe run larger gauge wire with some Anderson plugs to send more juice to the trailer while hooked up to tow rig.