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The Norfolk Broads Forum / Geeks Korner / I need to understand the theory here!
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Posted By Discussion Topic: I need to understand the theory here!

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Maurice_Mynah
Oct-02-2012 @ 10:13 AM                           Permalink
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If I were able to buy 3 x 80 amphour batteries at £80 each, or could buy 2 x 120 amphour batteries at £120 each, which would be the better choice?
We shall say that the batteries were the same make etc, and that space wasn't an issue.  

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londonrascal
Oct-02-2012 @ 10:22 AM                           Permalink
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There is probably no difference – you get the same capacity and if space and weight is of no issue then logic to have less doing the same job does not apply.

However, if you had 3 you would have more hassle to put them in, or take out if one failed and I wonder having them wired together – that extra wire on terminals may cause some current loss the alternator had to make up for, compared to just two 120 amphour batteries.


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waterbuoy
Oct-02-2012 @ 10:25 AM                           Permalink
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I would go for the 2x120AH batteries, if you could carry them. Each one being heavier than the 3X80AH ones. Also the wiring would be a little less complicated.

Furthermore with the 3 ranks of batteries, there are six more cells to maintain and check. More risk of an individual cell "going down". Remember the battery bank is only as good as the weakest cell.

As far as charging, I believe that both banks of batteries will present the same area of charging faces, so you would not gain anything in charging rate by using 3 instead of two batteries.


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This message was edited by waterbuoy on Oct-2-12 @ 10:30 AM

ranworthbreeze
Oct-02-2012 @ 10:31 AM                           Permalink
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Hi Maurice,

The only advantage that I can see if you fit the 3 batteries is that each should weigh less so may be easier to handle rather than the larger ones. The thought could be if one battery failed in each situation you would have more capacity with the three battery installation.

I take this theory is just for the domestic batteries and does not include the engine start battery.

Regards
Alan

Alan Hood
Ranworth Breeze Boat Syndicate
www.ranworthbreeze.co.uk

Regulo
Oct-02-2012 @ 10:47 AM                           Permalink
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I'd go for just two 120Ah batteries. If one battery in a bank of 3 goes duff, the others can be dragged into their death throes before you realise it. There's more chance of noticing a problem with just 2 in time to do something positive about it. Otherwise, it's your call, there's not a great deal of difference, performance-wise.

Regards, Ray.

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