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I know enough about this stuff to be (very!) Dangerous.....but I know a lot of folks use a device in their systems that allows charging of the entire system but limits drawdowns to the "backup" battery so they are never stuck without a charged battery to get the vehicle started. I will go check some sites to find the name of what I am thinking about but I want to say it's a "smart charger" or something like that.I also just read part of a thread at expo portal about a guy who's alternator failed and he was able to run a decent amount of miles off his solar panel charging his battery. Granted it was in the desert and thus I'm sure he had plenty of sun, but still a decent thing to have in an "uh oh" moment. It's in papawheelie's build thread in the fullsize section if you go there. I had never thought about solar panels from a "safety" perspective before (meaning help me get home) so definitely made me see them in a different light.