The LiFePo4 batteries take a special charging device to balance each cell. While the batteries are a good idea they aren't real practical for the average RVer yet.
For the hair dryer look at the battery bank size required for it. Better to just crank the ginny.
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2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy
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