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Old 12-27-2007
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i agree that if your rpms aren't up your output will fall. the load you are drawing exceeds the power production of the charging circuit so the voltage drops. remember that the rated output of your charger is a theoretical maximum, and as engine rpms decrease, output falls off precipitously.
you will need to check the sum of the current draws of all of your electronics, but i really doubt that that alternator will be able to maintain a charge on a deep cycle battery. you will need to connect to a decent shore-based charger when you get to port.
note that the current demands of a partially-charged battery alone will easily overload your very meagre charging system.
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