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Unread 02-04-2010, 04:36 PM   #11
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Default Re: Batteries 6-8v or 8-6v

251x48=12048,where did you get the .37 from? I understand the 3hr for a golf cart. Why would the golf course near me be using 4x12v batts now? It seems that 6v have the highedst AH ratings of any deep cycle batt. The best one I have seen, in the specs, is the US Batt 145XC. Now I just need to find them at a good price.
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Unread 02-04-2010, 04:59 PM   #12
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Default Re: Batteries 6-8v or 8-6v

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Originally Posted by dplin2001 View Post
where did you get the .37 from?
It is called the Peukert Effect: Peukert's Law, presented by the German scientist W. Peukert in 1897, expresses the capacity of a lead-acid battery in terms of the rate at which it is discharged. As the rate increases, the battery's available capacity decreases.

If you look at the Trojan T 105 spec web site they will give you very limited Peukert information by only showing the AH rating at the 5 hour discharge rate.

There are better batteries out there, and they show all the discharge curves like Rolls Surrette EHG 210 Spec Sheet Take a look. It is rated at 210 AH @ the 20 Hour rate. Now look at the 100 hour discharge rate and work your way down to the 1 hour rate. That 210 AH battery ranges from 279 AH @ 100 hours down to 72 AH @ the 1 hour rate.That is stingy Mr. Peukert at work enforcing his LAWS of physics.
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Unread 02-04-2010, 05:14 PM   #13
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Default Re: Batteries 6-8v or 8-6v

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Originally Posted by sunking View Post
It is called the Peukert Effect: Peukert's Law, presented by the German scientist W. Peukert in 1897, expresses the capacity of a lead-acid battery in terms of the rate at which it is discharged. As the rate increases, the battery's available capacity decreases.

If you look at the Trojan T 105 spec web site they will give you very limited Peukert information by only showing the AH rating at the 5 hour discharge rate.

There are better batteries out there, and they show all the discharge curves like Rolls Surrette EHG 210 Spec Sheet Take a look. It is rated at 210 AH @ the 20 Hour rate. Now look at the 100 hour discharge rate and work your way down to the 1 hour rate. That 210 AH battery ranges from 279 AH @ 100 hours down to 72 AH @ the 1 hour rate.That is stingy Mr. Peukert at work enforcing his LAWS of physics.
WOW, I looked at some of those Rolls batteries. I'm getting your point, I guess the best question is what battery gives you the best bang for the buck.
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Unread 02-04-2010, 05:15 PM   #14
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Default Re: Batteries 6-8v or 8-6v

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WOW, I looked at some of those Rolls batteries. I'm getting your point, I guess the best question is what battery gives you the best bang for the buck.
Well you get what you pay for. Trojan use to be the first choice for quality, but they have slipped into cost cutting and now sacrifice some of the quality they came to be known for. Start by looking at warranties. Is it 5 year pro-rated, or 10 year with last 5 years pro-rated. Which is better?
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Unread 02-04-2010, 05:26 PM   #15
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Default Re: Batteries 6-8v or 8-6v

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Well you get what you pay for. Trojan use to be the first choice for quality, but they have slipped into cost cutting and now sacrifice some of the quality they came to be known for. Start by looking at warranties. Is it 5 year pro-rated, or 10 year with last 5 years pro-rated. Which is better?
I like the 10yr with the last 5 pro rated, who has that.

I'm calling my local places now, I keep posting what I find;

Sam's Club; Energizer $74.00
Walmart; Everstart $75.00
Napa; East Penn Titian $71 never heard of this one.
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Unread 02-04-2010, 05:48 PM   #16
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Default Re: Batteries 6-8v or 8-6v

Batteries Plus; Trojan T-105 $99.99

I'll try more tomorrow.
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Unread 02-04-2010, 06:28 PM   #17
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Default Re: Batteries 6-8v or 8-6v

I found a pretty neat spreadsheet that you can plug info in and get the Peukert number for a given battery.

http://www.smartgauge.co.uk/calcs/peukert_2.xls

T-105 is 1.164
US 145XC is 1.121

From what I understand is that lower is better, ie less internal resistance.
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Unread 02-04-2010, 07:08 PM   #18
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Default Re: Batteries 6-8v or 8-6v

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Originally Posted by dplin2001 View Post
I found a pretty neat spreadsheet that you can plug info in and get the Peukert number for a given battery.

http://www.smartgauge.co.uk/calcs/peukert_2.xls

T-105 is 1.164
US 145XC is 1.121

From what I understand is that lower is better, ie less internal resistance.
I would be careful with it, I cannot say it works. If you have a 20 hour eating and discharge at lees than 20 hours say 5 hours, th enumber should be way less than 1.
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Unread 02-04-2010, 07:19 PM   #19
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Default Re: Batteries 6-8v or 8-6v

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I would be careful with it, I cannot say it works. If you have a 20 hour eating and discharge at lees than 20 hours say 5 hours, th enumber should be way less than 1.
I hate to just cut and paste, but researching and find lots of interesting stuff;

The Peukert Number generally is in a range of 1.05 to 1.4, with 1.05 the best performing battery due to less internal resistance

http://jgdarden.com/batteryfaq/carfaq7.htm#peukert
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Unread 02-05-2010, 09:52 AM   #20
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Default Re: Batteries 6-8v or 8-6v

Still check on batteries;

found some T-105's for $90 with no core charge.
Found the Interstate U2200 (US Batt 2200XC) for $95

any comment you guys have would be great.
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