equalizing and exercising [RE-wrenches]
Darryl Thayer
daryl_solar at yahoo.com
Thu Aug 24 23:22:15 PDT 2006
Hi Geoff
I have been reluctant to comment because I do not know
the answer, but it seems battery chemistry has an
influence. I have a customer with lead calcium
technology batteries who went 3 years with only float,
I tested and then I equalized and now 1 more year and
the batteries seem to still have good performance. (I
tested with a short term 100 amp load) I did not do a
discharge capacity test.
I have another customer with batteries that are lead
antimony technology and 3 years on float the batteries
were total loss. batteries were dry.
Both were set up at 54.0 volts float.
I have a third customer with 8d paralleled lead
calcium and float was set at 52.6 (customer changed
setting following others advice) after 3 years the
batteries were definitely low on charge and at first
refused to accept a charge. but after perhaps 1 to 2
months at 57 volts they began to accept, and now they
seem functional.
I do not know if the chemistry is the culprit, it
seems unlikely, but is one of the biggest differences
in these systems.
--- Geoff Greenfield <Geoff at Third-Sun.Com> wrote:
>
> We are instructing our customers with grid-tie
> battery back up set ups to
> exercise 2 x a year with a "simulated" overnight
> grid outage to bring down
> battery voltage. Then kick back into normal mode
> for a bulk charge cycle.
>
> Question #1 - how often? 2x per year is my gut
> answer but....
>
> For the same situation but with flooded lead acid I
> would like to add an
> equalize cycle right after.
>
> Question #2 - should we bulk, float and then EQ the
> next day?
>
> Question #3 - how often?
>
> Question #4 - how low SHOULD an effective exercise
> cycle be? in AH% or in
> battery voltage?
>
> Thanks to all who share their time - and thanks to
> all of us in this
> industry in this important time!
>
> For a brighter energy future,
>
> Geoff Greenfield
> NABCEP Certified Energy Practitioner
>
> THIRD SUN SOLAR & WIND POWER Ltd.
> 340 West State Street
> Athens, OH 45701
>
> www.third-sun.com
> (740) 597-3111
>
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages:
> http://lists.topica.com/lists/RE-wrenches/read
>
> List rules & how to change your email address:
> www.mrsharkey.com/wrenches/etiquette.php
>
> Check out participant bios:
> www.mrsharkey.com/wrenches/
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>
>
>
>
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
- - - -
To send a message: RE-wrenches at topica.com
Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read
List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php
Check out participant bios: www.mrsharkey.com/wrenches/
Hosted by Home Power magazine
Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com
EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com
For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------
More information about the RE-wrenches
mailing list