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Battery combiner question

Old 12-08-2003, 08:46 AM
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Default Battery combiner question

I have a single engine rig with 2 bateries set up like in the West Marine catalogue. My house battery seems to be running down. Maybe I use more juice than I put back in while cruising but I'm not sure. How can I tell if my combiner is actually shooting the juice over to the most depleted battery as it should. The little green light comes on but my voltmeter remains at the same depleted voltage. Shouldn't I be able to measure the charging voltage at my house battery when it is supposed to be charging? Any thoughts?
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Old 12-08-2003, 01:54 PM
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Default Battery combiner question

If the combiner is working, you should read 13.5 to 14 volts if the system is actually charging your house battery.



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Old 12-08-2003, 02:55 PM
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Default Battery combiner question

I could be wrong but I read somewhere recently that the second battery would not get any juice to it untill the starter or number one battery was fully charged then the secong bank would get charged.JMO



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Old 12-09-2003, 01:15 AM
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Default Battery combiner question

With the green light on both batteries are in parallel (combined) and should have the exact same voltage. This is because once they are in parallel they are electrically connected and the battery with the higher voltage will pass current to the battery with the lower voltage until they are the same. Best thing to do is to check the voltage of each battery with a digital voltmeter with the green combiner light on. If they are not the same maybe the combiner is defective and not parallelling both batteries. Check this website for some good information about the West Marine combiners. I have used one for 5 years now and have been very pleased with it. www.yandina.com



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Old 12-09-2003, 08:56 AM
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Default Battery combiner question

Ditto the above. I have a start battery for each engine and a large house battery bank all hooked together with 2 combiners. With either (or both) engines running and putting out juice the combiner lights come on and I measure 14.2 at the house bank. Sounds like it may be defective or not hooked up right (more likely).

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Old 12-10-2003, 03:41 PM
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Default Battery combiner question

Update---I decided to remove the combiner and replace it. When I removed the unit it had a small small burn hole in it. Installed the new one and now when the green light comes on I have 14.2 volts at the house battery. thyanks for the help.
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Old 12-10-2003, 05:57 PM
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Default Battery combiner question

Sounds like you might have shortened the length of the battery leads on the combiner? The length of those leads are the built-in protection for the internal relay in case you draw big amps through it. If you leave the leads the original length they can't be burnt out.

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