So I have a small solar setup (100w/200ah) in my camper van. I left the controller/panel/batteries hooked up thinking I would occasionally clear the snow and there would let the sun topped the batteries off. However, we had an extreme amount of snowfall this year, while all my focus was on keeping the roof & driveway clear, I pretty much neglected the van all winter.
I just cleared the 4 feet of snow off the top (I know this weight is horrible for the panel) and sure enough, I can't seem to get the controller to charge.
The controller is reading ~21v from the panel but no amps. I tested the amps with a multimeter and the panel is surprisingly still generating ~90w (about as good as ever).
The batteries however, are not in good of shape... They are currently reading ~9.8v. I realize that these batteries are probably ruined, but I just want to make sure I properly diagnose the problem before I go and buy new equipment.
I thinking one of two things might be happening:
- The charge controller (EPEVER 20A MPPT) is broken :(
- There is some low voltage protection on the charge controller that prevents it from charging if a battery doesn't meet a given voltage. I'm actually a little surprised that the display comes up at all with only 9.8v
Just looking for advice on where to go from here.
If I get my batteries back up to operating voltage, is there a chance the controller will kick on? Or should I just go ahead and bit the bullet and order a new battery. Also, could I test the charge functionality on the van starter battery to confirm that the charge controller isn't the issue?