I have a DVM (from Amazon) hooked up to the battery box and wired
directly to the batteries. I walk past it several times per day
while I'm camping and a quick glance shows what is going on.
If by mid-afternoon the voltage is > 13.0, I know the solar is working
and I have enough for the evening. If the voltage is 12.8 or below
then I may have to top up the batteries with the generator.
I have 1 solar panel hooked up during storage (with the battery
disconnected from the TT) and as long as I see > 12.8 then I know
that the batteries are topped for the next time I want to go camping.
