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Our friends have a 432 aH battery bank and a residential fridge. It takes them about 6 to 8 hours to recharge the battery bank for their usage rate.
The Onan manual says if you take that size battery bank to 50% SOC and recharge starting at 100 amps it will take 8 hours. The amps will decrease as the batteries charge over time.
If you go to the manufactures web site of the batteries you can get the charge times and voltages.
Properly maintained wet cell deep cycle batteries are good for 6 to 10 years.
The trolling motor battery we have on the boat is going strong at 8 years.
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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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