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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 Sep 1 2009, 12:51 AM
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Hi Kirk,

I apologize if that remark seemed "snide" to you. If there is a "chip" I hope it is part of an MPPT charge controller *grin*.

I do hope you read post #8 by me in this thread.

I'd love to hear what you have studied. I'm always eager to learn more.

I'd be most grateful for anyone to present definitive studies that prove that if the amp hours are equal that a six volt battery bank will out perform a twelve volt battery bank.

My maintenance on the twelve volt batteries in my previous RV, which have their seventh birthday in Sept 2009, was keeping them charged through 30 watts of solar power with an old style charge controller, watering them once per year and cleaning them once per year.

My costs per amp/hour and the lifespan of the batteries have been exceptional. It is not, however, "proof" that 12 volt units are "better".

One possible reason to lean towards 12 volts vs 6 volts is if there is storage space for only an odd number of batteries. In my new RV that would be 7 12 volt units. I could have done one bank of 4 six volt and one bank of 3 twelve volt--but I felt it was easier to just have all batteries the same.

If you wish to see a forum where I have posted information about the system with some measurements please surf here:

http://freecampsites.net/forum/technology/page-1/

And click on "Solar Boondocking".





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Don
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