Re: More about Battery Life, pls.

[william glickman <billglic@juno.com>]

Have those power pulse units been proven to prevent excesive sulfation
from not recharging so as to only recharge after reaching 50 percent DOD
?

On Mon, 30 Apr 2001 21:49:17 -0700 Lee Hart <leeahart@earthlink.net>
writes:
> Bob Bath wrote:
> > I noticed the part about overcharging.  Now, if I
> > follow the e-meter, I'd be equalizing ever time;
> 
> Then your E-meter's charging parameters aren't quite set up right. 
> You
> can set the charged voltage and charged current (percent) so it 
> resets
> well before the end of charge occurs if you like.
> 
> > Second, I hear that it's good to "drive every day,
> > charge every night."  But if I didn't pull more than a
> > kWh or two, not good to recharge. Is this correct?
> 
> It's a tradeoff. If you only drive short distances, not charging 
> every
> time reduces damage from overcharging, but increases damage from
> sulfation.
> 
> If you didn't discharge too deeply, and know you are going to use 
> the
> car again soon (within a day or less), you might as well not 
> recharge. A
> good example is if you use 25% of the charge driving to work, it 
> sits 8
> hours, and then you use another 25% driving home. In this case, NOT
> charging at work will extend battery life. You aren't exceeding 50% 
> DOD,
> you have cut the number of charge cycles in half, and sulfation 
> doesn't
> matter over such a short time.
> 
> But the longer it sits, and the deeper the discharge, the more of a
> worry sulfation becomes. For example, suppose your EV is a second 
> car.
> You drive to church and back every sunday, using 25% of your charge. 
> It
> would not be good to let it sit at 75% SOC for a week, drive it 
> again to
> church next week, then recharge it; sulfation would reduce battery 
> life.
> -- 
> Lee A. Hart                Ring the bells that still can ring
> 814 8th Ave. N.            Forget your perfect offering
> Sartell, MN 56377 USA      There is a crack in everything
> leeahart_at_earthlink.net  That's how the light gets in - Leonard 
> Cohen
> 

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