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Those batteries are 3.2 volts each so you need 4 to get 12.8 volts. Size is important since these are taller than lead acid batteries and need to be strapped together for 12 volts. My suggestion is to see which cells would fit then go from there. No solar on this coach. My inverter puts out about 100 amps so if I'm at 70% discharge it takes 7 hours.