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Old 18-09-2013, 20:23   #16
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Re: Fridge Working Continuously

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Originally Posted by deckofficer View Post
If you have the space, a really robust house bank would be (6) 2 volt cells in series. A small group 31 2 volt cell weighs 62 lbs and has 535 a-hr.

Sun Xtender PVX-5340T AGM Sealed Battery

I looked at your URL pointer, OUCH! $309 for a 2 vdc 534 ampere hour??? HOLY SMOKEY ANDY, that is a big pile of bucks! Now for 12 vdc, your recommendation is going to cost 6*309 = $1854. Do you really believe that is a good recommendation?

OK, I recommend 6vdc golf carts with wet cells. And I will also put a plug in for Sam's Club batteries @ $88 for each 230 ampere hour golf carts made by East Penn and sold with a Duracell label. And they weigh 64#s vs Trojan's T105s at 62#s.

Now you require 6 of them to get a 12vdc bank with an ampacity of 690 ampere hours. Your cost will be around $528.

WOW!!!! $528 VS $1854!

Foggy
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Old 18-09-2013, 20:36   #17
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Re: Fridge Working Continuously

My earlier post did mention as a step up, the 6 volt golf cart batteries. I'm just not a fan of replacing batteries every 2 years for 85 a-hr group 24 12 volt batteries, or every 4 years for the 235 a-hr 6 volt golf cart batteries. I've moved on to LiFePO4 cells and won't be using lead again, but for folks that don't want to be early adopters, those 2 volt cells if cared for would be good for at least 12 years, so yes 3 times the price but due to cycle life it is a wash and you don't have to lug heavy batteries as often. Plus being AGM, they have a better charge acceptance, no corrosion, no watering.

LiFePO4 is now the best bang for the buck, but initial costs is higher.
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Old 18-09-2013, 20:56   #18
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Re: Fridge Working Continuously

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Personally I don't believe maintenance free batteries have a place onboard a boat. The whole concept just assumes (somewhat correctly I suppose) basic physics and chemistry can be largely ignored by the public.
Technology marches on. AGM and sealed gel have several advantages that fit many cruisers' needs.

And vaseline on the posts and clamps is a decent way of preventing corrosion. It's not like he's greasing the posts and then putting the cables on...
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Old 18-09-2013, 21:26   #19
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Re: Fridge Working Continuously

idle, my adler barbour install manual recommended that i hard wire the fridge direct to the battery bank - bypassing the usual master panel. i did just that and installed a 15 amp circuit breaker in the line. i've found that voltage at the panel always seems to be less than voltage measured when wiring direct to the battery.

and rebel heart is right on with lead acid golf cart batteries; my last set worked for 6 years.
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Old 18-09-2013, 21:35   #20
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Re: Fridge Working Continuously

I too am a big fan of the good ol' 6V golf cart batteries. Super easy to find and seem to handle lots of abuse!
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Old 19-09-2013, 00:18   #21
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Re: Fridge Working Continuously

I will get checked the batteries in a battery service
to be sure that they are dying.
The batteries are in front of one of the water tanks
and not much chance of expanding the case.
Before this discussion I did not have the concept
of deep cycle batteries I mostly did buy 3 car batteries
75-85 Ah. One for the starter and windlas and 2 for the board.
They usually lasted 3-4 years. Quite satisfactory
in my usage conditions. I checked and saw that
the last 3 batteries costed me 210$ in total in
May 2011. With all the advice I will be more choosy
and concious.
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Old 19-09-2013, 12:32   #22
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Re: Fridge Working Continuously

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Originally Posted by Suijin View Post
Technology marches on. AGM and sealed gel have several advantages that fit many cruisers' needs.

And vaseline on the posts and clamps is a decent way of preventing corrosion. It's not like he's greasing the posts and then putting the cables on...

That may be. However the Russian Kilo subs which Russia has sold by the dozens use a diesel engine along with what appears to be lead acid wet cells manufactured for their subs in India. Maybe the Russians know something!
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Old 19-09-2013, 13:17   #23
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Re: Fridge Working Continuously

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And vaseline on the posts and clamps is a decent way of preventing corrosion. It's not like he's greasing the posts and then putting the cables on...
Well, that's exactly what I do (grease first, attach cables after). This ensures that all surfaces are protected, and the pressure on the mating surfaces is more than sufficient to squeeze out the grease and make a solid metal/metal gas-tight contact. The connectors / posts are far from smooth at the micro-level, and the rough points punch through the residual grease film. With or without the grease, that's how connectors work.
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Old 19-09-2013, 13:19   #24
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Re: Fridge Working Continuously

Same practice on our boat (grease first), only not vaseline - No-Ox-ID instead.

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