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Putting two 12 v batteries that are a 100 amp hour each in parallel are going to give you 200 amp hours but still at 12 volts, two 12 volt 100 amp hour batteries in series will only give you 100 amp hours but 24 volts, the parallel advantage is the combined amps but the draw back is the gauge of wire you will need to get all those amps to the controller, I think your 84 volts is a waste an you would get more out of your panels going to parallel, just my opinion
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