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  #11  
Old 09-19-2012
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Re: One battery or two?

Quote:
Originally Posted by mitiempo View Post
A solar panel is a good idea to keep the battery(s) charged between trips. This link shows how to size and properly install a small panel.
Installing A Small Marine Solar System Photo Gallery by Compass Marine at pbase.com

Your batteries may have 1000 cranking amps but they are probably about 100 AH or less each.

With you use and no need to have a battery for engine starting one good battery should be fine.
Agree completely. The reasoning for having two banks is so if you kill one accidentally you can still start the motor and recover. In your case you can start the motor manually so it's no big deal. Stick with one battery and save the extra wiring and complexity.

Make sure to get a proper deep cycle battery to replace the old ones.

Hmm technically my 1GM10 can be started manually and I have a lever for it. I really should try it sometime.
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  #12  
Old 09-19-2012
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Re: One battery or two?

Quote:
Originally Posted by chef2sail View Post
I would get 2 6 volt golf cart batteries and put them in series to ake 1 -12volt one. The foot print for those two will equal the size of a group 31 which is what others are recommending and give you 200 amp hours instead of 110 ah. Remember usable ah is 1/2 of the rated ah.

Even though this may seem a lot more than you need, one mistake people make is to not have enough, they add a few equipment items and viola they find they are short. You may in the future add a VHF, portable 12 volt cooler, stero, more lights , depth finder etc.

The cost isnt that great and you can get these on sale at SAMs./ BJ for cheap.

Thy can be charged by the olar panel easily also.

Dave
For a 22' with lights and a bilge pump? I think that's overkill. However I'm all LED now so my lighting power is down by a factor of 5 or 10 since I got the boat. It's amazing how much incandescent bulbs draw.
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  #13  
Old 06-17-2014
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Re: One battery or two?

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Originally Posted by rtawood View Post
Hi all,

I just bought a 22' swing keel boat (DS22). I am an experienced dinghy sailor and also had some experience crewing on a tall ship, but not much in between! The boat I bought has two very flat batteries, one is beyond salvaging, the other is reading just over 12V after a day of charging. They are both 1000A. The boat has an electric start for the outboard, although I am more than happy to just pull the starter chord. There is a bilge pump, some lights, a radio, water pump for a sink. That's about it. So do you think I really need two batteries? I will be day sailing and maybe spend the odd night on board. I am also thinking of installing a solar panel for trickle charging, so the number of batteries will influence the decision on what panel to get.

Thanks
I know this is a dated thread but thought I would comment... I use an auto pilot that seems to eat batteries pretty quickly. Using led lights and pull start on occasion doesn't take much power, however you never know how much charge the battery still keeps, as they degrade with the years and a little abuse...

What has been your experience so far?

M
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Old 06-17-2014
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Re: One battery or two?

In the end, I took the batteries out and don't bother with power. It's much simpler, particularly as I am on a mooring with no mains supply for charging. I did that all last year and it was fine. I start the outboard with the pull chord. I was going to fit a depth sounder, but to be honest I don't know how much use it would be anyway. I stay away from the shore and if get too close the centreboard scrapes! One of the advantages of having an iron centreboard that swings up.

Richard
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Old 06-18-2014
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Re: One battery or two?

Hi Richard,

Send me a private message so we can exchange, seeing we are nearby.

I am still a newbie and can't send PMs...
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  #16  
Old 06-22-2014
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Re: One battery or two?

Quote:
Originally Posted by DS22 View Post
I know this is a dated thread but thought I would comment... I use an auto pilot that seems to eat batteries pretty quickly. Using led lights and pull start on occasion doesn't take much power, however you never know how much charge the battery still keeps, as they degrade with the years and a little abuse...

What has been your experience so far?

M
I suspect if you are "eating" batteries its because you are draining them too far. You really don't want to go below 50% charge. If your outboard doesn't have a charger, then you need either a solar panel or a trickle charger (if you are at a slip) to keep it topped off. And you can check the charge by testing the battery specific gravity.
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Old 06-23-2014
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Re: One battery or two?

DS22, I PMed you can you read it?
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  #18  
Old 06-24-2014
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Re: One battery or two?

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Originally Posted by rtawood View Post
DS22, I PMed you can you read it?
I did but still can't send, too few PMs yet.

Mark
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