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post #1 of 17 Old 08-22-2007 Thread Starter
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battery charger

Any input on a battery charger? I have two banks that have 2 group 24 batteries in each for 150 hrs each. I have been trying to decide between a xantrex 20+ or a xantrex 10.
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post #2 of 17 Old 08-22-2007
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Suggest you look at the line of Iota chargers. Check out the chatter on this Board, the SSCA board, and the Cruisers Net board. Great chargers. Modestly priced. Hi-tech multi-stage PWM charging. Robust. I have two.

You can find them on eBay or at Jackrabbit Marine, among others.

For your total 300AH battery bank, you need a charger of at least 45A capacity. The Iota DLS-45 or DLS-55 would be ideal. If you get one, be sure it has either the internal or the external IQ-4 smart-charge device. They come both ways.

Bill

(I have no connection to Iota....just love their chargers)
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post #3 of 17 Old 08-22-2007
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Just curious, why do you have the banks split evenly? If you have a house bank, it would make more sense to have three-batteries in it...and leave one for the starter. If they're both house banks, it would make more sense to combine them into one large one.

I think that the two Xantrex chargers you mention are undersized to do a proper job.... and would second Bill's recommendation size-wise. However, I am not familiar with the Iota brand of chargers, but would trust bill's recommendation.

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post #4 of 17 Old 08-22-2007
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EDIT...OOPS...I read your note wrong. With 300 AH's. You need a bigger charger than you are planning. 60 amps would be about right but you can get away with less if you are simply doing dockside charging and speed of charge is not a factor. For flooded cells, the IOTA Bill notes is a much better bargain but you need to get their smart "regulator" as well to insure a proper charge regimen. I also agree with Dawg that ONE large battery bank for the house is a better approach for cruising/charging.
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post #5 of 17 Old 08-22-2007
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Cam...

I understood that he has FOUR batteries, i.e., two banks of two group 24 batteries EACH.

If, indeed, he only has two (or a TOTAL capacity of 150AH), I'd agree with you.

Bill
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post #6 of 17 Old 08-22-2007
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Cam, he has four group 24 batteries the way I read it.
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post #7 of 17 Old 08-22-2007 Thread Starter
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I had 2 - 4D batteries, which were to heavy for me to handle. I installed 4 -24 group batteries in their place, hooking 2 together in each box. Thus 2 banks of 150 hrs each.
I have an old heart converter/charger that has died, I also have on genset for 110vt power.
When I read all about Xantrex systms, the truecharge 20+ seemed like the one. However they claim the "battery " has to be 100-150 APH to work. My question is will 2 -75 Aph be the same, or will it over cook the batteries.
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Quote:
Originally Posted by Paysay View Post
Cam, he has four group 24 batteries the way I read it.
That's the way I read it. He goes on to say "for 150 hrs each." 150AH would be right for two g24's. So he's got a total of 300AH, between the two banks, it seems.

Jim
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post #9 of 17 Old 08-22-2007
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Seamyst,

Your questions have been asked and answered. To recap:

1. You need approx 40-60A battery charging capacity for a total bank of 300AH.

2. You did the right thing, IMHO, by using smaller batteries which won't break your back. HOWEVER, you need to be sure that they are connected together with LARGE wires -- 2/0 is my preference -- and, if possible, connect them together and use them as a single large battery bank rather than two separate banks. This is preferable for several reasons which have been discussed here and elsewhere. You can do this either by wiring them together directly, or using a 1-BOTH-2 switch and leaving it in the BOTH position.

You didn't mention a starting battery. I assume you have one and that it is independent of the house batteries, as it should be, and that it is switched separately (i.e., not connected to the selector switch for the house batteries).

The preferred way to treat such a system these days is to hook all charging sources -- battery charger, alternator, generator, solar panels, etc. -- directly to the HOUSE battery bank, and to maintain the starting battery separately using a device like the Xantrex Echocharge. This works very well.

Bill
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post #10 of 17 Old 08-22-2007 Thread Starter
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Thanks, for all the help. I like the idea of using the selector switch to combine banks ans have total of 300 hrs. I'll add another battery for starting engine as it was part of the bank. I am looking at the IOTA chargers, and they seem to only charge one bank. So a starter battery on it's own will make sense, and have it charge by alternator.
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