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  #41  
Old 11-22-2012
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Re: Battery Sizing - am I crazy?

I suggest two banks of two 6v golf cart batteries for house use, and two 6v golf-cart starting batteries.

If you have the space, which I do on a Morgan 41' OI, use eight 6v golf-cart batteries for the house, wired so serial pairs provide 12v to bus lines. Golf-cart batteries are relatively cheap, and can be found everywhere. Plus you can maintain, test, and trade them out yourself anywhere without any giant hassle.

Lots of juice is important if you have women aboard and an inverter.
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Re: Battery Sizing - am I crazy?

Quote:
Originally Posted by Minnewaska View Post
Not so fast. I have nearly 20 batteries aboard
Yowza! Don't you think it might be time to consider a gen set?
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Re: Battery Sizing - am I crazy?

Quote:
Originally Posted by SloopJonB View Post
Yowza! Don't you think it might be time to consider a gen set?
Have a genset for sure.

House... 4 batts
Winches... 2 batts
Windlass... 2 batts
Bow thruster.... 2 batts
Main start... 1 batt
Genset start.... 1 batt
Dinghy start... 1 batt

Think I overshot with 20, but 13 still makes the point.
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Old 11-22-2012
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Re: Battery Sizing - am I crazy?

Quote:
Originally Posted by Minnewaska View Post
Have a genset for sure.

House... 4 batts
Winches... 2 batts
Windlass... 2 batts
Bow thruster.... 2 batts
Main start... 1 batt
Genset start.... 1 batt
Dinghy start... 1 batt

Think I overshot with 20, but 13 still makes the point.
I am curious how they are all charged! It could have been accomplished with less batteries and good cabling.
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Old 11-23-2012
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Re: Battery Sizing - am I crazy?



I am pretty sure



You use to have something like this (two group 27s)

They have much better custom hold downs NOW

Two is good just because of things like having TWO bilge pumps on different 24 hour circuits on each battery just in case




And ACR with a small solar control keeps the whole deal happy and I NEVER need to run the motor as are weekend needs are some led cabin lights

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Re: Battery Sizing - am I crazy?

Quote:
Originally Posted by mitiempo View Post
I am curious how they are all charged! It could have been accomplished with less batteries and good cabling.
Since the house is 12v and the winches, windlass and thruster are 24v (hence the 2 12v batt each), it would be difficult to gang too many together. Have separate banks for the 24v systems allow redundancy. Who would want to get back to the dock and find the thruster is dead.....

To combine some of these would require running some battery cables 20 feet or more. That's not a good idea.

All but the genset start have shore powered chargers that can obviously be powered with the genset too. The main alternator will charge the house and main start.
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Re: Battery Sizing - am I crazy?

Quote:
Originally Posted by Minnewaska View Post
Since the house is 12v and the winches, windlass and thruster are 24v (hence the 2 12v batt each), it would be difficult to gang too many together. Have separate banks for the 24v systems allow redundancy. Who would want to get back to the dock and find the thruster is dead.....

To combine some of these would require running some battery cables 20 feet or more. That's not a good idea.

All but the genset start have shore powered chargers that can obviously be powered with the genset too. The main alternator will charge the house and main start.
Cap'n Nat & LFH must be up to several hundred RPM in their graves.
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Re: Battery Sizing - am I crazy?

Beets me how I ever sailed away with oil fired nav and compass lights. Mind you, at only 22 tons I could easily weigh anchor by armstrong and sail up to a dock.
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Old 11-24-2012
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Re: Battery Sizing - am I crazy?

Along with the OP has not been heard from since day one!

maybe over his/her head!?!?!?!?!???

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Re: Battery Sizing - am I crazy?

Perfect for your use, I had the same on a 27-footer.
I had two batteries that Costco sold as Marine batteries, i.e. slightly more robust automotive starting batteries, even smaller than the ones you linked to, I think about 60 Ah, $50 each.
Works perfect for day sailing and weekends.
A switch separating the two batteries is good to make sure you always have power to start in the morning.
Run one somewhat empty, but leave enough power to start, then use the other one. IF you run it empty over night, you can still start, and use almost all capacity.

And before the yaddaing by 'battery experts' starts:
Automotive starter batteries (which these are, in essence) DO survive the running REALLY low on occasional weekend use very well, for practical purposes. They last years.
Shorten theoretical battery lifetime by 50%, and you still have several years of use, and are out of $50.
As proven by people who have to jump-start their cars.


Quote:
Originally Posted by chartscharts View Post
All,

My CAL29 is in need of new batteries. The existing ones are shot and won't hold a charge. I wanted to solicit opinions about downsizing drastically.

My existing batteries are a bank of two of these: Trojan EV8D, 12Volt, 220AH@20hr, batteries. They are big and weigh a gazillion pounds a piece. More than I can easily remove myself, a big disadvantage.

My needs are modest. It primarily needs to start my Farymann A30, single cylinder, 10HP diesel. I have the usual running lights and house lights and VHF radio.

My sailing habits are almost exclusively day sailing. 2-3 times a year (on good years) I'll take it out for an overnight. I could use battery powered camping lanterns on those even, since it's not very often.

So I think I might be able to drastically downsize, allowing for easier and cheaper maintenance and replacement. Going to something like two of these:

[retarded sailnet policy counts your link as one I may not post; removed]

Am I crazy? What am I not thinking of?

-Charts
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