We have a 120 watt GoPower folding panel/built in charger with legs, that folds and fits into a hard shell suitcase. It fits in the back of our Mini wagon. It has supplied us with all the power we need, for the refrigerator, furnace, trailer lights and TV, we charge our laptops, phones, iPods, backpack speakers, rechargeable camp light and kindles as well. Even in the southern states we really only get 5-6 hrs of harvest time in the winter. If it is overcast it still charges, just not as much so we won't charge our devices cuz we'll need the juice for the fridge and furnace. We have not augmented the batteries on Dewey, we only use the one battery that came with the trailer. In the summer the fridge is gonna use more power but we won't be using the furnace and of course we'll have way more harvest time. It's so easy too, when we 1st set up camp I'll break it out and set it up, I lock it to the trailer so it won't walk. That's it, if we're in camp I'll clock it with the sun, if we're away I'll just set it for mid day. It's been great for us, sure beats a noisy smelly generator or having to camp next to the big noisy smelly RVs ( I think I have a theme going here ) to get a power post.
Hope this is helpful
Michael