hello! first of all, this whole time I thought marine batteries WERE deep cycle batteries, but I guess that shows how much I know.
Secondly, I know this probably defeats the entire purpose, but have you considered the inclusion of a small diesel generator, like the homemade electric car they built on Top Gear? Their solution was... flawed, at best, but I think it has real potential if executed properly. That would mean a need for less batteries, reducing weight. It should theoretically extend the life of the batteries as well by keeping the voltage from dropping too much. However, diesel generators are not exactly cheap even for a used one but it may or may not prove to be a cost effective alternative to buying a whole slew of brand new, high quality cells. Anyhoo, just a thought, hope it helps
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