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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Electrical Systems
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  #11  
Old 06-08-2009
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If your battery drops below 12V you are quickly killing it.
You're gonna be buying a lot of new batteries if you wait till 11V.
12.25 is the lowest you should normally let it go.
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Adding a little context to Cam's post ...



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Windy...I have charts from a very well respected mfr. that show far less difference between 30% an 50% discharge for THREE different ranges of batteries....
Cycles 4200>>>3200
1707>>>1280
768>>>576

That is the difference in cycle life between 30 and 50% discharge on their good/better/Best batteries. The important thing to note is that in each case in terms of AMP HOURS delivered over the life of the battery...cycling to 50% gives you more than cycling to 30%.
This is NOT the case with your last graphic nor does it resemble anything else I have seen. Are you at liberty to share the source and type of battery that was being tested in your above post?
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Old 06-09-2009
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Quote:
Originally Posted by camaraderie View Post
Windy...I have charts from a very well respected mfr. that show far less difference between 30% an 50% discharge for THREE different ranges of batteries....
Cycles 4200>>>3200
1707>>>1280
768>>>576

That is the difference in cycle life between 30 and 50% discharge on their good/better/Best batteries. The important thing to note is that in each case in terms of AMP HOURS delivered over the life of the battery...cycling to 50% gives you more than cycling to 30%.
This is NOT the case with your last graphic nor does it resemble anything else I have seen. Are you at liberty to share the source and type of battery that was being tested in your above post?
Hey Cam, it came from here ...

Source: 12 Volt Electrics in A'van for Manins
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Old 06-09-2009
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I would scrap the small starting battery and just go with a single deep cycle battery. With an outboard, you can start by pulling manually if the battery is low. I sailed for years on Pearson 26 with a 8hp Johnson that charged a group 24 deep cycle house battery. It kept the charge up with no problem on cruises as long as three weeks.
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Thanks Windy...that is from FullRiver out of China for their AGM's. The 50% cycle life is really low. Wonder why?? Would certainly explain the low prices!!
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Old 08-18-2009
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Why don't you

Why dont you just do away with the little motorcycle battery, and run off the house bank entirely. That little outboard isn't going to take enough out of a deep cycle house battery to effect it much. Will eliminate a battery, some wiring and simplify things too.
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