Almot wrote,"To 3 tons - yes, absolutely. 300W array can support you without a generator. You only need to be reasonable and avoid high-current devices. Doable. "
You can use high current but the key is how long you do it. You don't need to be one of those self-denial is a virtue people. Enjoy your RV!
20 minutes of microwave, kettle, and toaster in a day is about 35AH. A 130w panel lying flat can do 56AH in May at 49N. So 300w is huge.
Besides that, in the afternoon, once the batts are near charged you can use your "free" solar to run lots of things. Eg, when it is hot in the afternoon I run the monster 120v ceiling fan our trailer has (Komfort must have got them off the noses of old P-51 fighters) from the inverter at no discharge of the battery at all. Also get some laptop time in, anything you want.
So in summer now we get essentially all the kettle, toaster, and microwave time we want, plus other goodies and use under 50AH /day that the battery ever sees. That's with one 230w panel. You do need a generator ready to go if it gets overcast for a couple days though.
Catching up on just solar once you get behind in some bad weather is not so good an idea. The surplus once the sun comes back would let you catch up eventually, but by then you will have gone several days without a full recharge, so now you get sulfation setting in and have to do an equalize session.
Instead I run the gen to catch up and then go right back to hitting full daily on solar. That way seldom need to equalize in summer.
