Boat has ten (10) 6 volt 220 Ah flooded house batteries that are nearing end-of-life and plan to replace them with 6 volt for low weight (66 lbs each) and AGM for ease of maintenance. I only want to install the minimum number of batteries that can support 9 hour trips between ports for recharging to minimize cost. Calculated power consumption from highest to lowest power consumers for autopilot, sounder, chart plotter, radar (standby), refrigerator (50% load), VHF (standby), engine instruments and bilge pumps (0.2% demand) operating 9 hours per day is 144 Ah. West Marine suggests sizing the battery bank for a minimum of 3 times the daily energy consumption (see link below), which indicates sizing the battery bank for 431 Ah. That would indicate minimum number of batteries are two pairs of 6 volt 220 Ah batteries wired in parallel with the pairs wired in series producing 12 volts and a capacity of 440 amp hours. I plan to install a battery monitor once I take possession of the boat I plan to install a monitor to measure power consumption on its 10 hour trip to her new marina. Does that make sense or is there a better battery sizing approach?
I also investigated the top five performing AGM battery in post #24 of the thread below and was told by the Firefly, Odyssey and Northstar manufacturers they do not make 6 volt AGM batteries Lifeline, Fullriver and Rolls do. I am leaning towards Lifeline.
I also investigated the top five performing AGM battery in post #24 of the thread below and was told by the Firefly, Odyssey and Northstar manufacturers they do not make 6 volt AGM batteries Lifeline, Fullriver and Rolls do. I am leaning towards Lifeline.
Sizing Your House Battery Bank | West Marine
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Battery Brands
Jim Hawkins.................are they flooded or AGM and what Ah rating?
forums.sailboatowners.com
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