So I’m looking at replacing my house batteries on my 2009 H36 within a year and doing some research. I’ve read the AGM thread and done some reading in MarineHowTo.com as well. I’ve installed a Victron BMV-712 monitor, and am nearly done installing 160 watts of solar run thru a Victron 100/20 MPPT. Currently have PO installed 2 4D Deka (WM branded) 198 Ah AGMs and a ProMariner ProTech i 1230i Plus shore charger, and a stock 60 amp internally regulated alternator and (new) belts on the 3YM30. The reason I’m considering replacing is the batteries are original (I’m fairly certain), and capacity loss is substantial, though I’m still working on a test as MaineSail prescribed to get a tighter figure on capacity remaining. My usage is mostly day/weekend overnight sails, with occasional 7-10 day trips away from the slip. Otherwise the boat is plugged in and the charger engaged. My energy consumption is 130Ah/24 hrs away from the dock. I sail on the Chesapeake bay.
I’m leaning toward 3 paralleled Group 31 110Ah Firefly batteries. I’m primarily interested in thoughts on what I may need to do with regard to my alternator and/or shore charger, if anything. I would like to maximize the life on the Firefly batteries. Other suggestions welcome.
I’m leaning toward 3 paralleled Group 31 110Ah Firefly batteries. I’m primarily interested in thoughts on what I may need to do with regard to my alternator and/or shore charger, if anything. I would like to maximize the life on the Firefly batteries. Other suggestions welcome.