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Ev Archive for September 2000
1238 messages, last added Wed Aug 08 18:49:38 2001

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RE: US vs Trojan (was New EV owner, battery questions)




Hrmm,
	So, this seems to tell me that if I really suck the amps out of a
set of batteries, drawing them down to "dead" (By what metric do you
determine a battery to be "dead" in these cycle tests?) having pulled only
50% of their low-amp-draw AH capacity out of them, they will be at 50% DOD?
If this is true, assuming one can suck the batteries down to this 50%DOD
"dead" state reliably will the batteries have the same cycle lifetime as
other ways of drawing them down to 50%DOD assuming they are otherwise taken
care of? (IE, kept watered, charged properly, kept from overheating, etc...)

	I'm asking because it seems that this would be a way to get a
flooded pack to last a long time while still getting decent amperage
performance out of them... Though only going to 50% DOD. Might be more
economical than Optimas, at least. 
-Will

> -----Original Message-----
> From: Nawaz Qureshi [mailto:nqureshi@usbattery.com]
> Hi David:
> 
> Very good question. The battery capacity is a function of the rate of
> discharge. The higher the rate (Ampere draw)  the lower the 
> available capacity.
> 75 Amperes is higher than 56 Amperes therefore the battery 
> will deliver lower
> capacity at 75A. than at 56A. from the total available. 
> Therefore, lower DOD. I
> hope it makes sense. I will be glad to explain further if necessary.
> 
> Sincerely
> 
> Nawaz Qureshi