As stated, batteries in series adds the voltage and keeps the amp hr rating of the batteries the same. Batteries in parallel, keep the voltage the same but add the amp hr ratings of the batteries.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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