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Old 02-12-2014, 02:08 PM
Gerry Zagorski's Avatar
Gerry Zagorski Gerry Zagorski is offline
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Default Re: electrical breaker problem

Having two batteries in parallel is not going to overload your system. However having 2 batteries in parallel in general is not great idea because if one battery is weak it is going to drain the other. The best thing to do is isolate your batteries so they charge and discharge independent of one and other. Typical set up is a starting battery which is 100% dedicated to starting the engines and a house battery which is used to power your electronics. Theory here is that if your electronics run down the house battery no big deal since you still have the starting battery to start the engine.

Some boats are wired with parallel switches which allow you to temporarily parallel batteries together. This way if the battery you have dedicated to starting the boat is weak or run down you could temporarily parallel it with the house battery and start the boat.
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