We have 2 Group 29 batteries and have had no problems staying unplugged for 4 days at a time until a Mar trip to southwest Texas. We had to move to the generator section after 2 days.
Once home, I installed 165 watts of solar. It came with a 20 Amp controller. Haven't had it back out to see if it keeps up with us while using it. We're fairly conservative so I'm hoping it will.
I've had the camper unplugged for several weeks with it sitting under our camper "port". There's about 3 feet of space from the panel to the roof of the cover, so no direct sun, and it's keeping the battery up with the small loads from the CO detector, gas detector, charge controller, and the radio memory.
Currently the only thing I think it needs is a battery monitor. I installed a cheap battery monitor a couple of years ago and am finding that it is not accurate enough to be worth while with the solar. I ran some tests and found it only accurate at the calibration voltage and current. So when the voltage and current rises above or drops below the calibration point, it's not measuring accurately and therefore the state of charge info can't be trusted.
Bottom line, if you want a trust worthy battery monitor you may have to spend a few extra dollars. Interesting that an accurate battery monitor costs more than the whole solar install. It's something you don't have to have.
