RE: Battery Cycle Life/Cost

["Roger Stockton" <rstockton@delta-q.com>]

> -----Original Message-----
> From: owner-ev@listproc.sjsu.edu 
> [mailto:owner-ev@listproc.sjsu.edu] On Behalf Of Mike Chancey
> Sent: January 26, 2002 9:13 PM
> To: ev@listproc.sjsu.edu
> Subject: Battery Cycle Life/Cost

[snip]

> Considering the current power consumption of my Civic,
> roughly 350 watt hours/ mile due to hills and heater use,
> the 12.5 miles of each workday commute leg uses about 28%
> of a charge.  So, the battery pack is asked to deliver
> about 728 cycles at 28% depth of discharge.  The question
> is, how many cycles can I expect the batteries to deliver
> before failure?

Hi Mike,

I haven't got data on the Dynasties, but FWIW, here's the data on the
Concorde Sun-Xtender series of AGMs (available in 6 & 12V models):

80%DOD: ~550 cycles
60%DOD: ~800 cycles
30%DOD: ~1800 cycles
20%DOD: ~2800 cycles
10%DOD: ~5200 cycles

These figures are valid for discharge at the C/1 rate to 1.75Vpc at 25C,
recharged at 2.4Vpc, and end of life is when the battery is down to 80%
of its rated capacity (still perfectly usable since you could keep
cycling it until it retained just 30-40% of rated capacity in your
application).

You'll find dimensions and capacity info on the Concorde website, but
you'll have to phone them and request the Sun-Xtender booklet for the
life cycle and other detailed data.  Dynasty may be able to provide
similar info for their batteries if you call and ask for it.

Cheers,

Roger.