Re: [Amel Yacht Owners] Onan Generator and Starting Battery
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As bill mentioned the Generator/engine start battery negative should not be connected to the house bank.
The generator has a floating ground which means as soon as the generator is started the generator is disconnected from the battery, The only thing that is connected to the battery when the generator is running is the Isolated ground Alternator.
Did you check to see where the leads for the Blue Seas volt meter are connected?
If it has its ground hooked to the generator you will get an erroneous reading as it is no longer connected to the battery. What reading do you get when the engine is running?
Make sure that the voltmeter is connected both negative and positive directly to the battery.
I believe this might be your problem.
Kimberlite Amel Super Maramu #376
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Monday, April 25, 2016 8:51 PM
Subject: Re: [Amel Yacht Owners] Onan Generator and Starting Battery
I think the only person(s) capable of answering your start battery question is the previous owner and/or the person that installed that Bluesea battery monitor because Amel did not. Assuming that it is installed correctly (it sounds like that could require a leap of faith), you probably have a short in the 12vdc alternator on the generator... But that is a wild guess.
And, the starting battery is 12vdc and the house battery system is 24vdc. They should be isolated from each other.
Have you located the shunt on the negative side of the starting battery? Where is it? Take a photo? I think you probably have an installation problem with your monitor.