We have had a $200 solar system for several years (Renogy via Amazon, 100 watts). We live in northern Alberta near the beginning of the Alaska highway. We find it too hot in summer and rarely use the furnace. We have two batteries but they never go below 80% charge so one would be adequate. We are just modest users of electric energy. The solar system is the best thing we added to our little motorhome. We always boondock, never plug in, no generator. The $200 was a terrific bargain. So nice to enjoy camping without a generator occupying valuable space when driving and making noise while camping.
For cool nights, use a comforter. For coffee, use a kettle on the propane stove. Turn off the fridge defroster.
