<br><font size=2 face="sans-serif">Hi Larry,</font>
<br><font size=2 face="sans-serif">Looking at the Rolls Solar Battery User
Manual regarding corrective equalization, on pg. 9 line 5, it reads :</font>
<br><font size=2 face="sans-serif"> "If severely sulfated, it
may take many hours for the specific gravity to rise". </font>
<br><font size=2 face="sans-serif"> In William's case, the SG is full.
This condition where the batteries do not seem to be "absorbing"
the charge happens</font>
<br><font size=2 face="sans-serif"> more often with sealed batteries.
Maybe it is related to the degree of sulfation.</font>
<br><font size=2 face="sans-serif">Rgds<br>
</font><font size=3 color=#008000>_____________________________________________________________________________________</font><font size=3>
<br>
</font><font size=1 face="Arial"><b><br>
Eric Bentsen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Solar
Business</b> | <b>UNITED STATES</b> | <b>Technical
Support Representative</b> <b><br>
Phone:</b> +(650) 351-8237 ext. 001# | <b><br>
Email:</b> </font><a href="mailto:eric.bentsen@schneider-electric.com"><font size=1 color=blue face="Arial"><u>eric.bentsen@schneider-electric.com</u></font></a><font size=1 face="Arial">
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| <b>Address:</b> 250 South Vasco Rd., Livermore, CA 94551
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<br>
<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">"Larry Crutcher,
Starlight Solar Power Systems" <larry@starlightsolar.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">07/24/2013 05:29 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] Tri-Star MPPT</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">re-wrenches-bounces@lists.re-wrenches.org</font></table>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Jay, </font>
<br>
<br><font size=3>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.</font>
<br>
<br><font size=3>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.
</font>
<br>
<br><font size=3>Larry<br>
</font>
<br><font size=3>On Jul 23, 2013, at 9:32 PM, jay peltz <</font><a href=mailto:jay@asis.com><font size=3 color=blue><u>jay@asis.com</u></font></a><font size=3>>
wrote:</font>
<br>
<br><font size=3>Hi Eric,</font>
<br>
<br><font size=3>While agree with most all your assessments, </font>
<br><font size=3>Can you please elaborate on the "sulfation causes
the voltage not to climb?"</font>
<br>
<br><font size=3>This is quite counter to what I have seen and what the
battery people say?</font>
<br>
<br><font size=3>Thanks</font>
<br>
<br><font size=3>Jay</font>
<br>
<br><font size=3>Peltz power</font>
<br><font size=3><br>
Sent from my iPad</font>
<br><font size=3><br>
On Jul 23, 2013, at 2:48 PM, </font><a href="mailto:Eric.Bentsen@schneider-electric.com"><font size=3 color=blue><u>Eric.Bentsen@schneider-electric.com</u></font></a><font size=3>
wrote:<br>
</font>
<br><font size=2 face="sans-serif"><br>
Hi William,</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
If the SG was 1.26, of course the battery voltage would increase <br>
quickly to >30V (which is high for warm weather, BTW).</font><font size=3>
</font><font size=2 face="sans-serif"><br>
It has been my experience that sulfation causes the voltage NOT to climb.
Especially when you have a very large bank, and a</font><font size=3> </font><font size=2 face="sans-serif"><br>
relatively small amount of solar.</font><font size=3> </font><font size=2 face="sans-serif"><br>
Sometimes it is necessary to reduce the bank size into smaller sets to
equalize them and recover their performance.</font><font size=3> </font><font size=2 face="sans-serif"><br>
This method of reducing bank size is also effective to compare performance
and weed out a potentially bad battery. <br>
Systems that have a lot of capacity, with a relatively small amount of
charge current usually creates problems, because</font><font size=3> </font><font size=2 face="sans-serif"><br>
the load demand exceeds solar production.</font><font size=3> </font><font size=2 face="sans-serif"><br>
This results in batteries that operate with partial SOC, which is when
sulfation is most prevalent. With (8) L16s, you have approx</font><font size=3>
</font><font size=2 face="sans-serif"><br>
800Ahrs of capacity (24V bank). It would take significantly more than
8A of charge current to properly care for a bank that size.</font><font size=3>
<br>
</font><font size=2 face="sans-serif"><br>
Rgds,</font><font size=3 color=#008000><br>
_____________________________________________________________________________________</font><font size=3>
</font><font size=1 face="Arial"><b><br>
<br>
Eric Bentsen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Solar
Business</b> | <b>UNITED STATES</b> | <b>Technical
Support Representative</b> <b><br>
Phone:</b> +(650) 351-8237 ext. 001# | <b><br>
Email:</b> </font><a href="mailto:eric.bentsen@schneider-electric.com"><font size=1 color=blue face="Arial"><u>eric.bentsen@schneider-electric.com</u></font></a><font size=1 face="Arial">
| <b>Site:</b></font><a href="http://www.schneider-electric.com/solar" target=_blank><font size=1 color=blue face="Arial"><u>
www.schneider-electric.com/solar</u></font></a><font size=1 face="Arial">
| <b>Address:</b> 250 South Vasco Rd., Livermore, CA 94551
</font><font size=1 color=blue face="Arial"><u><br>
</u></font>
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