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Old 05-06-2011, 21:51   #1
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Need new batteries and charges - any help?

Hey all... we are facing a charger failure and need to replace it. We are looking at a 30A charger, with 3 leads to charge 4 batteries-two starting batteries and two house batteries. Any feedback on which charger to use? We are leaning towards ProMariner brand because of features. Also, both house batteries are dead. The question is do we use Gel or AGM? We see benefits and negative for both. The WestMarine tech suggested an 8D gel and had lots of valid reasons, but many of you use the 4D. Why? Also, give some feedback regarding gel vs. AGM. We have a 30 ft cruiser that is plugged in rarely. We have an onboard generator and the biggest Ah user is the fridge. Any help you can give will be appreciated.
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Old 05-06-2011, 22:02   #2
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Re: Need new batteries and charges - any help?

the 8d is a big heavy thing maybe 150 160lb or more so not using them may be just an issue of handling them Perhaps you may wany 2 smaller adding to the same total amp hrs
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Old 06-06-2011, 09:02   #3
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Re: Need new batteries and charges - any help?

Welcome Aboard Cruisers Forum and enjoy the site...

Instead of 8d or 4d's, I would use paired 6V batteries. Easier to handle, more amps, easier to handle, cheaper overall. Also, if a cell goes bad you don't have to throw away an expensive 8d vatt. Almost everyone uses 6V batt.

Check with Batteries - Interstate Batteries has every battery for every need , you usually get discounrs for multiple batteries..
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Old 06-06-2011, 09:10   #4
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Re: Need new batteries and charges - any help?

I just installed a Charles Marine 5000 30 Amp charger. It has 3 leads, but the directions say each lead needs to go to one battery. You have 4 , so I would think you need a charger with 4 leads - 1 per battery

http://www.charlesindustries.com/mai...chcch_ad2.html
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Old 06-06-2011, 09:15   #5
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Re: Need new batteries and charges - any help?

The instruction should be indicating battery banks, not individual batteries
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Old 06-06-2011, 09:27   #6
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Re: Need new batteries and charges - any help?

After talking to Charles I stand corrected you can have 2 or 3 batteries on a lead and be Ok. I asked him about integrating Solar and Wind power into the system and he said it would not harm the charger if both were supplying power to the system at the same time. The charger will just shut down if the green power is supplying more poewr than the charger.
Would love to heard about other green power users on what you have done. I am working on installing both solar and wind on the boat
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Old 06-06-2011, 09:29   #7
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Re: Need new batteries and charges - any help?

Quote:
Originally Posted by Unicorn Dreams View Post
The instruction should be indicating battery banks, not individual batteries

they said banks, but only showed one battery - thus my confusion
I am a visual learner :-)
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Old 06-06-2011, 09:44   #8
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Re: Need new batteries and charges - any help?

If you go with Gel or AGM batteries be careful that the new charger program is working to the charge specs of your batteries. Our brand new 6v AGM batteries did not last long (1 year) because the charger maintained them on too high a voltage. Our neighbour at the marina had his Gel batteries go in even less time for similar reasons. Expensive lessons. This is good technology but one should check the charger is doing the right thing.

By the way, as gluttons for punishment, we have ordered Lithium Ion batteries.
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Old 06-06-2011, 12:09   #9
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Re: Need new batteries and charges - any help?

About parallel ve series. As a land electrician you would generally not want it wired in series, as has been said before - one goes out all go out. The kit I bought has 4 panels and they are pre-wired and just plug into each other. The last one has a cable that runs to the controller, so I am assuming they are wired in parallel, but don't know for sure. Didn't think to look as it was a plug and play system, but my curosity it peaked and will go back and see.
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