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2021 MXZ 24 w/M6 and Stern turn. Battery Option 3(ACR), 170 AMP alternator. Currently have 2 group 24 Interstate Cranking batteries. Not sure why it's not a cranking and a deep cycle?? I get a low house bank warning(have read others have dealt with this too)if using the stern turn too much. Volts drop a ton even just bumping it off/on for short burst. At a minimum I want to upgrade to a Group 31 AGM(X2, Lifeline,Odyssey)for the house and then a group 27 AGM for the Starting side. But ideally I would like 2 31's in parallel and a 27 for starting. A couple questions: Haven’t measured yet, can I fit 2 group 31s and a 27 into the bow compartment on the new MXZ? Will 31's fit at all? Worst case would like to have 2 31s in the bow and a 27 in the observer storage area by the amps. Anything special in regards to wiring with the ACR? Wire the 31s in parallel on one side for the house and keep the 27 alone for starting? Imagine I would also need to upgrade the Noco Genius Gen 2 Mini, 2 Bank, 8A on board charger? I'm sure 4A/bank is fine if I did a group27/31 2battery set up, but not sure how 4 Amps would work on 2 31's in parallel. If I'm looking at it right, 2 31s in parallel would make an approximate 200A bank(using X2 Batteries for example), if discharged to 50% it would take almost 25 hrs to recharge?? Not that it would be that low on a normal basis, but probably down in the 20-40% discharged range so 10-20 hours to recover and run through the recharge process. Maybe go with a 2 bank 20A, so each bank is getting 10A?? Am I thinking about all this correctly? Thanks