I've thought about trying to get an A/C style clutch mounted on the crankshaft, allowing me to stop the rotation of my alt + power steering belt. But I couldn't find one that would just bolt on.
No matter which way you go, you're going to need a deep cycle battery. You'll also have to bring the alternator with you, in case you need to take a longer trip than expected. Solar does not solve that problem, since solar doesn't work in the rain or at night.
Trivia: PV panels are 10-15% efficient at converting sunlight into electricty. There will be additional losses in converting their output to a regulated 13.5V.
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