Re: 12 volt power problem -- Buzzy's Question and Answer Forum

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Subject: Re: 12 volt power problem

Author:
Don Duncan

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Date Posted: 05/ 30/ 03, 10:33pm
In reply to: BFW 's message, "12 volt power problem" on 05/ 26/ 03, 3:57pm

I cleaned the heck out of all the terminals I could find including the positive post (frame mounted and very dirty) that goes to the batteries suspecting that dirt might be providing a path to ground. My voltage drop is now about .01V between the charger and engine battery bank.

Before this, and with the dying old chargers, I got about a .5V drop. I can't say that cleaning was the solution but with my coach constant tinkering is paying off. No telling when or where I might have truly corrected the problem.

I have not intentionally done load testing but no longer see a significant difference (.1V). Depending on how much your charger is helping out though you would expect to see a voltage drop at they batteries the more they carry the load.

1980FC30

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[> Subject: Re: 12 volt power problem

Author:
Bob Dilks
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Date Posted: 06/ 17/ 03, 10:14am

My thoughts are you have a converter/charger problem, all other aspects being normal. Your "charger" should pick up all the DC load up to about 75 amps before the batteries begin to show depletion. However, your batteries may have "taken a set" by being discharged to low voltage and not fully recharged and are no longer capable of being fully recharged. The nominal voltage of a fully charged 12 volt battery bank without input or output is 12.7 volts. Turn off your charger, let the batteries rest for a day and test the charge across the entire bank. The surprise voltage you received when your inverter/charger was turned off was likely from the generator start battery.

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