question

swan38 avatar image

Sailboat rewire

Good Day All,

In the process of rewiring our boat. 100 amp alternator, 1 starter battery (105amp) 3 house batteries (315 amp) all are lead acid.

I am looking at the Argo FET for the alternator and an IP22 battery charger.

I know the FET will charge both banks. My concern is the charger.

My question: How do I wire the charger so that it will charge both banks (house and starter) and maintain the ability to use a 1 2 or both switch?



wiring diagram
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1 Answer
Justin Cook - Bay Marine Supply USA avatar image
Justin Cook - Bay Marine Supply USA answered ·

@swan38, unfortunately the IP22 charger will not work for you if you're trying to maintain two separate banks because it uses a common ground rather than isolated outputs. If you connect two separate battery banks to a common ground, you now have one battery bank.

The absolute easiest way around this is to simply use two separate chargers, although there are also chargers available which have isolated outputs (ie, a two-output isolated charger will have two separate negatives and positives).

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