The difference between gr. 27 and gr. 31 agm batteries is indeed the size.
If you have a battery monitor connected then entering the AH let's it predict the available capacity, runtime etc. If you have a more sofisticated charger then inputting the battery parameters tells it how to charge the batteries most efficiently and most importantly charges the batteries correctly.
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2018 RAM 5500 Laramie CC
Sold: Riverstone Legacy 38RE, 960 Watt Solar, 6x6 Volt AGM Battery Bank, Freedom SW 3012 Inv/Charger
Ordered: 2021....
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