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post #12 of Old 11-02-2007
Telstar 28
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Of course with anything larger than an 100 Amp alternator, the size of the cables starts to become an issue.
Originally Posted by camaraderie View Post
Hoffa...sorry but that is not right. Wet cell batteries can only take about MAXIMUM of 20% of capacity during bulk charging which means that a 60amp altenator is fine for a 300ah bank.
Even with charging system loss...fully charging is simply a matter of time. Incomplete charging can happen with ANY size charger and is definitely a problem if you don't monitor what is happening in your charging routine.
He does not need a bigger or better alternator cause the boat will be MOST of the time at the dock and the charger will put on a proper charge and EQ when needed. Nothing bad is going to happen to his batteries in a week of cruising with a standard regulator even if he doesn't pull into a dock. Why spend an extra grand on a big alternator/regulator and install if you don't need it?

AGM batteries can take unlimited current and a 100amp range alternator would be more appropriate for those if a quick charge was needed. (Note: Going too much over 100amps on most sailboat engines causes bearing wear and creates a whole 'nother set of problems to deal with to insure that wear does not occur...otherwise you could add a 300 amp alternator for AGM's if you weren't worried about the horsepower loss!)


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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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