a) Amps availability (like say CCA) IS ADDITIVE (i.e. if each had say 500 CCA you now have 1000 CCA Capacity)
b) Energy Storage (Amp hrs) IS ADDITIVE (i.e. if each battery were 125 Amp hrs you now can store 250 Amp hrs of energy
c) Voltage obviously stays the same
HOWEVER if two are wired in series
Voltage is ADDITIVE but the amp capacity does not, i.e. if each had 500 CCA, two in series still only has 500 CCA. The sum of avaialble current isnt greater then the weakest battery can deliver.
Its BEST if the two are identical in size, brand, design, type and age etc. When two are together the weaker can detract/feed from/cannibalize from the stronger battery.
For house batteries in an RV its more ENERGY STORAGE CAPACITY that youre lookin to increase (to run fans n lights n vents n furnaces etc) so 12 volt batteries in paralell keep adding energy storage as batteries are added........
My current RV (house batteries) has three 12 volt, 125 amp hour, Group 31, RV/Marine (Quasi Deep Cycle) batteries in paralell for 375 Amp Hrs
My next RV will use four 6 volt deep cycle Golf Cart (like Trojans or other similar brands) in series paralell for 440 Amp Hrs Energy Storage and I will be using a Xantrex 3 stage smart charger instead of the cheapie RV Inverter for better battery life (more life cycles) hopefully
Its my opinion if there will be a lot of deep cycle draw down useage, i.e. many life cycles (typical for an RV when dry camping or running furnace all night) youre better off with true deep cycle golf cart type of batteries versus so called RV/Marine what Id consider quasi deep cycle batteries. You dont need short term high current draw capacity like for an engine starter motor,,,,,,You need longer term capacity lower current useage like when an RV runs lights n fans n furnaces THATS WHY I THINK A DEEP CYCLE GOLF CART TYPE OF BATTERY IS BEST IN THAT APPLICATION
Thats my story n Ima stickin to it
John T Long time RV owner who has done a bunch of long term dry camping
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