SailNet Community - View Single Post - WARNING..shore power ON, engine ON is a NO-NO
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post #21 of Old 01-14-2008
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General rule when charging is to DISCONNECT the battery from alternator, normally turn off main. The reason is that all diodes have a certain leakage. Charging from shorepower with main on, this leakage might lead to overheating of the diodes in the regulator and short it. If it 'burns off' (open) nothing will happend except the alternator will not work, but if shorted, unregulated AC goes out, and that might cause fire in cable harness due to overcharging. Another reason for the incident might have been that the batteries have been shorted, and the alternator has been charging at max amp output, more than the harness have been able to handle. Shore power chargers normally goes to 20-30 Amps at max, if an alternator of 75Amps ore more starts it might be a problem. Have see a lot of people changing alternators from std 55-60 Amps to 100+, but they never emodify cable harness accordingly.
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