Long-suffering readers know that I like to poke fun -- gently I hope -- at campers who are Gandhi or Thoreau wannabees. They also know that I am not a solar purist. A rational and professional camper uses technology up to the point of diminishing returns. (Or more correctly, the point of diminishing marginal utility.) And yet there are solar purists who make it work for them. People who have vans or motorhomes probably don't count, since they can always charge their house batteries from their engine battery on a cloudy day. So let's only discuss trailers. A trailer-puller can connect their tow vehicle to the trailer, and run the engine. But that charges too slowly, perhaps 7 or 8 Amps. So what do you do when you finally admit that even Arizona is not sunny every day, and that you occasionally park under trees, or near the perpetually cloudy Coast? Buy a windmill? Never heard anything good about them. Besides, you need to supplement a solar system with a secondary system t
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