Yah, good question certainly...
I have 3x160w = 480-watts and 3sets of 2-6vt batteries.
I feel I have enough, but need a new controller to manage it all
While there are calculations that you can use, amps needed to run everything you need to run, I've sort missed all that.
I just run TV/DISH/DVD and a laptop and I'm right at a breakeven maybe on a good sunny day.
There will probably be those that say I have way too much, don't need it all etc, but it is what it is in everyday life. I have to run the Honda Gen and don't feel I should. Rarely get up to the 14.4 level and even fewer times to the "Full" charged level.
So with that in mind, I'd double whatever is recommended due to poor sunlight, shade factors etc...
I might go with another 160, four on the camper roof and as a last resort another set of batteries but I don't think I should have too, for some reason it's just not working as "I" think it should be (dealer installed), so the new controller is the first stop...
Hope that helps...
Solar is nice
