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Subject: Re: [worldcruising] Battery charging and Batteries
From: Will Parker (whildenp@XXX.XXX)
Date: Fri Jan 11 2002 - 22:41:46 EST
First, what systems do you have to draw down your house bank? You need to
do an amp audit to determine what your daily amp usage is. If the only
thing you need to do is start your engine and run your VHF, then perhaps
your two group 24's are sufficient. You just need new (quality) batteries.
If, on the other hand, you have much more electrical needs, then you need to
size your system to support your needs. Recommend you read Nigel Calder's
book (or equivalent).
I have a Cape Dory 30. I have refrigeration, auto-pilot, navigation and
cabin lights, pressure water, GPS, and VHF, resulting sometimes daily
requirements approaching 100 amps. There is no way two group 24's could
begin to handle that. I have a house bank consisting of three group 31 (105
amps each) AGM's, and a single group 31 AGM as my starting battery. To feed
this monster, I installed a Balmar high output 75 amp alternator and 3 stage
regulator in place of the old Motorola 55 amp automotive alternator that
came with the engine. I also have a 100 watt Siemens solar panel dedicated
to the house bank. This seems to be sufficient.
Good Luck.
Will Parker
"Jambalaya"
Cape Dory 30C
----- Original Message -----
From: Bluewatersailing <bluewatersailing@XXX.XXX>
To: <live-aboard@XXX.XXX>
Cc: <worldcruising@XXX.XXX>
Sent: Friday, January 11, 2002 6:22 PM
Subject: [worldcruising] Battery charging and Batteries
>
> Hello group,
>
> I have three questions about batteries. At this
> point, I have a very simple battery system - "off-1-2-both"
> with two 12v group 24 (85 ah) batteries (seavolt 675 - dual purpose).
>
> I use one for cranking and the other as a house bank. No
> fancy inverters or charger, I just run my engine every
> 10 days or so to charge my batteries.
>
> 1- My house bank is dead or dying. Any recomendations for
> a good, resonable group 24 deep cycle battery?
>
> 2- When I charge the batteries with the engine, does it
> charge any faster or better if charged at a higher rpm. Is it
> better to charge at 1500 rpm vs. 1000 rpm. It seems the
> less rpm you use the less diesel fuel used?
>
> 3- Is there a problem in my set up mixing regular batteries
> with sealed gel cell batteries and different ah's? My
> neighbor has a little used "Interstate sealed gel - 75 ah"
> battery that he'll sell me cheap for my house bank. Is
> there a problem having a house bank 75 ah sealed gel
> cell and a cranking 85 ah dual purpose regular battery.
>
> Thanks very much for your answers in advance.
>
> William
> s/v making way
> Cape Dory 30
>
> ~~~~~Sailing San Francisco Bay~~~~~
>
> -end-
>
>
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