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> Battery Prices From Sam's Club, cost per amp
pianotuna
post Aug 29 2009, 10:00 AM
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Hi All,

Battery prices from Sam's Club

G29 125 AH $79.42
G27 115AH $68.87
Golf Cart 6V 220AH $71.28

Based on dual batteries this equates to:

G 29....@....250 amp/hr = $0.63 per amp hour
G 27....@....230 amp/hr = $0.60 per amp hour
Golf Cart @ 220 amp/hr = $0.65 per amp hour

Before anyone does the "old saw" that six volt batteries last longer I'll point out that my last set of 12 volt batteries are six years old and still going strong. The "secret"? A 30 watt solar system with an old style charge controller.

I'll also point out that the dual G 29 set has 12% more amp hour capacity than the "twin" six volt set.


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Don
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pianotuna
post Aug 31 2009, 03:29 PM
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Hi all,

I won't get into the six volt vs twelve volt debate. It is to my mind, foolish, because what matters is the number of available amp hours. In an ideal world I'd use an LI battery pack--but that's beyond my (financial) means. My next choice would be 2 volt cells from Surrette. That is also too much "ouch" for my pocket book.

Here is what is may be done to keep lead acid batteries happy.

1. sufficient capacity in amp hours so that the battery is never taken below 50% of capacity. The more amp hours the merrier.

2. sufficient capacity so that when high watt items such as an electric water heater are used that no battery has more than a 25 amp hour draw.

3. a three stage charging system that is temperature compensated. This may easily be accomplished with solar panels where there are 60 watts of panels per 100 amp hours of capacity.

4. routine maintenance such as watering cells and keeping corrosion down.

5. all batteries to be of same capacity and similar age. It is probably best if they are from the same maker, too.

If this is done the batteries may last a long time.


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Don
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