There is to much water under the bridge. It can't be nothing. The battery
manufacture make the battery and then forms the plates, he ships the battery
expecting and knowing that the user will cycle the battery. In the cycling
process there are "chanels formed in the plate for acid to enter, and
consequently the plate becomes a better plate. the cycling forces avenues to
form, and as everyone knows the battery capacity increases. this increase is
easy to see in the performance. Then the battery begins to very slowly lose
capacity as the plates detererate.over several thousand cycles.
The enlightenment here is the small minimum number of cycles it takes to
maintain a battery. A flooded Lead antimomy battery has a self discharge rate,
during that discharge H2SO4 becomes H2O the H2O rises to the top, leaving acid
at the bottom. now you have stratification, in the presence of H2O the lead
Oxide softens and will actually desolve. the water and acid need to be mixed,
so a bubling action is rfquired, this is controlled over charge. So as long
as the battery is equalized that is the only cycleing it needs per John and
Jammie.
Darryl
________________________________
From: Maverick Brown [Maverick Solar] <maver...@mavericksolar.com>
To: 'RE-wrenches' <re-wrenches@lists.re-wrenches.org>
Sent: Sunday, February 19, 2012 8:04 PM
Subject: Re: [RE-wrenches] cycling flooded batteries is not necessary
Other than some
statements I have heard about battery reaching full capacity after X cycles...
Maybe that is a wives-tale as well.
Otherwise, maybe I was not clear.
By cycling, I mean daily (or periodic) Absorbas I mentioned in the email, not
loading/draining the battery (other than the clear statement to test to see if
the system actually works as a backup systemevery once in a while).No real deep
draining necessary. For instance, after some months without issue, one customer
called in a panic because the electricity did go off one night and they had no
backup. Turns out, somehow they turned off the "Inverter" function. Easy
solution, press a few buttons, etc. to turn on the
inverter.
Maybe
all I need is a Time function attached to Selling, like the Charge function has
on some brands. Who knows.
It is
clear that FLAs have a self discharge and some percent of capacity is obtained
during Absorb, so a long term Float only might reduce some of the batteries
capacity.
Anyway, Outback does have the "Absorb before Sell" function
when using the FN-DC in the system. Not sure about the newer version of
hardware. The "Parameters Met" settings gave me fits until I figured it out.
Plus, the FN-DC is not free.
The XW
has a function for Absorb before/during sell. I think it requires a XW CC. We
use every brand of CC appropriate for the site. Also, the setup instructions
are weird in my mind since it requires the Grid Support Voltage to
programmed to very high value. I wish they would just have added the function
"Enhanced Interactive Mode = Enable", etc.
Ok,
enough rambling...
Maverick
________________________________
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of
toddc...@finestplanet.com
Sent: Saturday, February 18, 2012 3:37
PM
To: RE-wrenches
Subject: [RE-wrenches] cycling flooded
batteries is not necessary
to
reiterate wrenches:
two
battery manufacturers (surrette & trojan) have both stated there is NO NEED
to cycle floating, flooded lead-antimony batteries. i have heard this urban
legend for some time and it is nice to finally have it put to rest as an
incorrect myth.
todd
On
Saturday, February 18, 2012 7:04am, "Doug Wells"
<dwe...@thesolarspecialists.com> said:
>
Maverick,
>
> "But you would think after 20 years, inverter
manufacturers would make some
> software similar to generator cycling to
handle this cycling issue. "
>
> I believe that the XW Inverters
have this ability in sell mode. There is
> traditional sell voltage. And
then there is a setting that puts the batteries
> through a traditional
bulk cycle while still "selling" back any excess energy.
> The next
question would be, is this better for battery longevity. Seems like a
>
hybrid of the two would be ideal.
>
> Doug Wells
> The Solar
Specialists
> Morrisville, VT 05661
> (p) 802-223-7014
> (c)
802-498-5856
> www.thesolarspecialists.com
>
>
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