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Old 08-07-2013, 11:28 PM
PremierPOWER PremierPOWER is offline
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Join Date: Aug 2013
Boat: Lots
Location: Midwest
Posts: 20
It's best to charge a battery isolated otherwise when the first battery in a paralleled set is 100% the charger will go into float mode even if the other is less than 100% (assuming its an automatic smart charger). It would behest to do one battery for starter and 3 for stereo with an isolation switch between parallels. Have two two bank chargers and the switches That way you can break the parallel with the switches in the off position and each battery will have its own bank for charging. This is even more critical if using different brand and age batteries for the paralleled 3 but it would be best to have those 3 all the same battery and same age. Of course your next problem will be ruining a stock alternator
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