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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 11-02-2007
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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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  #12  
Old 11-02-2007
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Of course with anything larger than an 100 Amp alternator, the size of the cables starts to become an issue.
Quote:
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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  #13  
Old 11-02-2007
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bestfriend- If you are still at Alameda let me know and I can help you install/watch/drink your beer/learn or mess things up for you
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  #14  
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bestfriend- If you are still at Alameda let me know and I can help you install/watch/drink your beer/learn or mess things up for you
A very generous and self-less offer...
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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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  #15  
Old 11-02-2007
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bestfriend- If you are still at Alameda let me know and I can help you install/watch/drink your beer/learn or mess things up for you
Thanks gunny. I still live in Alameda, the boats in SF. Would love to have you aboard, i'll keep you informed. You could hang out, drink beer, and jab me with the forespar right when I get really frustrated! We were supposed to go out yesterday, but if you noticed, it was pea soup and no wind. Trying to go out again next week, maybe monday, if you are up for it, I will drop you a line or PM me with your phone number.
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  #16  
Old 11-02-2007
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FWIW my boat came with Surette wet cells that are 8 years old and still going strong. They charge quickly. I think they sell them as Rolls in the states.
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Old 11-02-2007
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Thanks, SM. I need to check the cells before I give them up for dead. Maybe just a better charging system will fix the problem. Not sure what brand mine are.
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  #18  
Old 11-02-2007
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Sailormann...yep...Rolls/surette...excellent batteries and priced that way!
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Old 11-02-2007
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Don't take offense at this, but you did top them up with distilled water eh !

Quote:
.yep...Rolls/surette...excellent batteries and priced that way!
...I'm thinking that if they last ten years then it might be cheaper to buy them than to replace others every two or three years...

Last edited by Sailormann; 11-02-2007 at 11:01 PM.
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  #20  
Old 11-02-2007
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Don't take offense at this, but you did top them up with distilled water eh !

...I'm thinking that if they last ten years then it might be cheaper to buy them than to replace others every two or three years...
Not rum? (No offense taken.)
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