[RE-wrenches] Tri-Star MPPT
Eric.Bentsen at schneider-electric.com
Eric.Bentsen at schneider-electric.com
Wed Jul 24 09:21:38 PDT 2013
Hi Larry,
Looking at the Rolls Solar Battery User Manual regarding corrective
equalization, on pg. 9 line 5, it reads :
"If severely sulfated, it may take many hours for the specific gravity to
rise".
In William's case, the SG is full. This condition where the batteries do
not seem to be "absorbing" the charge happens
more often with sealed batteries. Maybe it is related to the degree of
sulfation.
Rgds
_____________________________________________________________________________________
Eric Bentsen | Schneider Electric | Solar Business | UNITED
STATES | Technical Support Representative
Phone: +(650) 351-8237 ext. 001# |
Email: eric.bentsen at schneider-electric.com | Site:
www.schneider-electric.com/solar | Address: 250 South Vasco Rd.,
Livermore, CA 94551
*** Please consider the environment before printing this e-mail
From:
"Larry Crutcher, Starlight Solar Power Systems"
<larry at starlightsolar.com>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>
Date:
07/24/2013 05:29 AM
Subject:
Re: [RE-wrenches] Tri-Star MPPT
Sent by:
re-wrenches-bounces at lists.re-wrenches.org
Jay,
I saw that comment also. The more hardened lead sulfate becomes, the more
resistant the battery is to the electrochemical process and therefore less
current is drawn from the charge source. This decrease of load allows the
charge voltage to rise more rapidly. This rapid rise is usually a first
indicator of sulfated batteries. A healthy battery, charged at the proper
rate, will always have a gradual, linear rise in voltage.
Just FYI, I am a hands on guy and my experience with servicing batteries
is somewhat unique to our wrench group having designed, installed and
serviced many hundreds of battery systems. Lead sulfation and it's cause
and prevention has been an interest of mine because it is so prevalent.
Larry
On Jul 23, 2013, at 9:32 PM, jay peltz <jay at asis.com> wrote:
Hi Eric,
While agree with most all your assessments,
Can you please elaborate on the "sulfation causes the voltage not to
climb?"
This is quite counter to what I have seen and what the battery people say?
Thanks
Jay
Peltz power
Sent from my iPad
On Jul 23, 2013, at 2:48 PM, Eric.Bentsen at schneider-electric.com wrote:
Hi William,
If the SG was 1.26, of course the battery voltage would increase
quickly to >30V (which is high for warm weather, BTW).
It has been my experience that sulfation causes the voltage NOT to climb.
Especially when you have a very large bank, and a
relatively small amount of solar.
Sometimes it is necessary to reduce the bank size into smaller sets to
equalize them and recover their performance.
This method of reducing bank size is also effective to compare performance
and weed out a potentially bad battery.
Systems that have a lot of capacity, with a relatively small amount of
charge current usually creates problems, because
the load demand exceeds solar production.
This results in batteries that operate with partial SOC, which is when
sulfation is most prevalent. With (8) L16s, you have approx
800Ahrs of capacity (24V bank). It would take significantly more than 8A
of charge current to properly care for a bank that size.
Rgds,
_____________________________________________________________________________________
Eric Bentsen | Schneider Electric | Solar Business | UNITED
STATES | Technical Support Representative
Phone: +(650) 351-8237 ext. 001# |
Email: eric.bentsen at schneider-electric.com | Site:
www.schneider-electric.com/solar | Address: 250 South Vasco Rd.,
Livermore, CA 94551
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