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First off, I am by no means an expert regarding 12V battery systems. I do, however, want everyone here to keep in mind that whenever you’re using wet cell lead-acid deep cycle batteries, you should only be discharging them to no less than 50% of their rated capacity. This also holds true of any conversion to flooded GC2 golf cart batteries. Discharging them more than 50% will seriously reduce their capacity and lifespan. Oh yeah, and don’t forget to maintain the batteries’ electrolyte levels.
For any long-term dry camping, I would highly recommend an appropriately-sized solar panel array and charge controller to replenish the batteries on a daily basis. I have (2) GC2 batteries on my 2017 Passport, and I use a 3-panel ground-mounted 300W array that I built myself with stuff I had in my garage and bought off of eBay. While I’ll never get the full 300W out (due to reasons more complicated then I can cover here), the array is more than sufficient to recharge my batteries in half a day of full sunshine after a night of using an inverter for some medical hardware.
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TT: 2017 2520RL, Twin Trojan T105s, BM-1 Compact, Xantrex SW1000, Curt Roundbar WDH
TV: Mostly stock 2016 Bluejeans F-150 XLT FX4 SCrew 5.0, 6.5' bed...
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