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<div class="moz-cite-prefix">Drake,<br>
I'll add just a bit to Jarmo's excellent reply:<br>
You mentioned that you were unsure if the MX60 was set to auto-EQ.
This could be a source of trouble. The MX60 had the unfortunate
characteristic whereby if set to auto-EQ, it would continue to try
to complete an EQ indefinitely once triggered. As such, if the
array was not sufficient to hold the batteries above the EQ
voltage for the set duration, or as the batteries aged and their
internal resistance increased such that the EQ voltage couldn't be
maintained, the controller would never complete and exit EQ mode.
31V, while conservative, is high enough to cause this.<br>
<br>
If that is what occurred here, then disabling automatic EQ and
reducing the EQ voltage below gassing threshold should prevent
recurrence.<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span
style="mso-bidi-font-weight:bold">Positive Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
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On 11/18/2014 11:03 AM, <a class="moz-txt-link-abbreviated" href="mailto:Jarmo.Venalainen@schneider-electric.com">Jarmo.Venalainen@schneider-electric.com</a>
wrote:<br>
</div>
<blockquote
cite="mid:OF70183381.71B24287-ON88257D94.005F30B8-88257D94.00632DB7@US.Schneider-Electric.com"
type="cite"><font face="sans-serif" size="2">Hi:</font>
<br>
<br>
<font face="sans-serif" size="2">This may not be the problem, but
I wanted
to bring it up as I have heard of a few cases of battery boiling
issues
with various charge controllers and want to suggest a possible
cause.</font>
<br>
<br>
<font face="sans-serif" size="2">I'll do this point form. It's
easier to describe it that way:</font>
<br>
<br>
<font face="sans-serif" size="2">1. Solar charge controllers are
programmed
to go to bulk charge in the morning.</font>
<br>
<font face="sans-serif" size="2">2. The intensity of the sunlight
starts
off low in the morning and depending on the weather during the
day, the
intensity can reach any level between virtually 0% and 100%.</font>
<br>
<font face="sans-serif" size="2">3. The exit criteria for bulk is
that
the battery voltage reaches the Vbulk/abs volts setting or a
bulk/abs timer
times out.</font>
<br>
<font face="sans-serif" size="2">4. If the sunlight conditions are
just
right to keep the charging voltage just below the Vbulk/abs
setpoint, the
exit from bulk/abs will be the timer.</font>
<br>
<font face="sans-serif" size="2">5. Bulk/Abs timers are usually
set for
rather a long time, many hours is not uncommon.</font>
<br>
<font face="sans-serif" size="2">6. Given the above, it is
possible that
the battery stays at gassing voltages for many hours every day
at certain
times of the year when the sunlight intensity is just right to
support
that.</font>
<br>
<font face="sans-serif" size="2">7. As a consequence the boiling
problem
will show up only at particular sites, particular battery/charge
controller
sizes and particular times of year.</font>
<br>
<br>
<font face="sans-serif" size="2">Again, I am not suggesting that
this
is necessarily the cause of battery "boiling" in systems with
solar charge controllers, but it could be a reason.</font>
<br>
<br>
<font face="sans-serif" size="2">2nd ps. All manufacturers do
precise
battery voltage/current measurements on the bench with a wide
variety of
conditions, but we will never be able to simulate the 1000's of
conditions
that happen on the 1000's of installs out there. With that in
mind,
on-site battery voltage/current data logging is a very powerful
tool when
investigating these kinds of issues.</font>
<br>
<br>
<font face="sans-serif" size="2">JARMO<br>
</font><font color="#008000" size="3">_____________________________________________________________________________________</font><font
size="3">
<br>
</font><font face="Arial" size="1"><b><br>
Jarmo Venalainen</b> | </font><font color="#008000"
face="Arial" size="1"><b>
Schneider Electric </b></font><font face="Arial" size="1"><b>
| Solar
Business</b> | <b>CANADA</b> | <b>Training &
Development Specialist - Senior</b> <b><br>
Phone:</b> +604-422-2528 | <b>Fax:</b> +604-420-1591 |
<b>Mobile:</b> +604-505-0291 <b><br>
Email:</b> </font><a moz-do-not-send="true"
href="mailto:jarmo.venalainen@schneider-electric.com"><font
color="blue" face="Arial" size="1"><u>jarmo.venalainen@schneider-electric.com</u></font></a><font
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| <b>Site:</b></font><a moz-do-not-send="true"
href="http://www.sesolar.com/" target="_blank"><font
color="blue" face="Arial" size="1"><u>
www.SEsolar.com</u></font></a><font face="Arial" size="1">
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<b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 <br>
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<br>
<br>
<br>
<table width="100%">
<tbody>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">From:</font>
</td>
<td><font face="sans-serif" size="1">Drake
<a class="moz-txt-link-rfc2396E" href="mailto:drake.chamberlin@redwoodalliance.org"><drake.chamberlin@redwoodalliance.org></a></font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">To:</font>
</td>
<td><font face="sans-serif" size="1">RE-wrenches
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>,
</font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">Date:</font>
</td>
<td><font face="sans-serif" size="1">11/18/2014 09:15 AM</font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">Subject:</font>
</td>
<td><font face="sans-serif" size="1">[RE-wrenches] Suspect
MX 60</font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">Sent
by:</font>
</td>
<td><font face="sans-serif" size="1">"RE-wrenches"
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches-bounces@lists.re-wrenches.org"><re-wrenches-bounces@lists.re-wrenches.org></a></font></td>
</tr>
</tbody>
</table>
<br>
<hr noshade="noshade">
<br>
<br>
<br>
<font size="3">Hello Wrenches,<br>
<br>
An MX 60 boiled a 24 volt bank of 4 Trojan L-16 batteries last
summer.
The batteries all checked out to be in good shape. It is not
totally clear
that the CC was not set to auto equalize, but the EQ voltage was
only set
at 31.0 V. <br>
<br>
The battery bank has been replaced by 8 Full River L-16 AGM
batteries.
The parameters have all been reset for AGM with EQ disabled. The
homeowners
are concerned that the charge control may not work, and damage
their new
battery bank. <br>
<br>
If there is a problem with the CC, it is very intermittent. Has
anyone
ever seen an intermittent MX 60? <br>
<br>
Outback tech support says if we send it in they will update the
firmware
for $90, and do a 24 hour bench test. It appears that the
firmware update
will not do anything useful for this off grid system. There are
no new
boards available for this unit. I'm not sure if the bench test
will show
up an intermittent problem. <br>
<br>
Has anyone had this situation before? Would it be better to: </font>
<ul>
<li><font size="3">Replace the CC </font>
</li>
<li><font size="3">Send the CC to Outback </font>
</li>
<li><font size="3">Do nothing </font></li>
</ul>
<font size="3">Thank you,<br>
<br>
Drake <br>
<br>
Drake Chamberlin<i><br>
Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328</i></font><font color="blue" size="3"><u><br>
</u></font><a moz-do-not-send="true"
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<br>
<br>
<br>
<br>
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