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Old 26-12-2012, 06:41   #16
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Join Date: Jun 2010
Location: Sint Maarten / Saint Martin
Boat: Caliber47LRC - MAKAI
Posts: 78
Re: Shore power voltage fluctuates 90V-120V

Cleaning the outlet on our boat did the trick, we cleaned the copper nipples, which looked OK but apparently is does not need much dirt to mess with the Voltage. Thanks all.

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Old 26-12-2012, 16:24   #17
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Join Date: Jan 2012
Boat: IRWIN 10/4
Posts: 58
Re: Shore power voltage fluctuates 90V-120V

I would make the test simple and use the 120vac light bulbs on your boat with all the complicated stuff like battery chargers off. Turn on one light bulb at a time and see if the 120vac meter continues to drop. If you see a decrease in voltage with an increase in AC loads like light bulbs, it could be something simple like a loose terminal connector or screw to your AC power panel or any connection between the meter, plug, cords, etc. If you use light bulbs for the test, you should see the bulbs get dimmer as the load increases if you have a bad connection. 60 watt 120 volt bulbs only draw a half amp so it would take several to be as many AC amps as your battery charger uses .This test is better than sacrificing your charger until you discover the bad connection. Be careful and disconnect your shore tie connection when you get to your panel connections.

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