<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">Figuring out what happened after the
fact is a very big challenge and always involves a lot of cost for both
time invested and ultimately the new batteries.</font>
<br>
<br><font size=2 face="sans-serif">Things can be made a lot simpler, even
preventative, by using a small battery monitor which remembers battery
V, I, SOC, etc........ for up to 10 years.</font>
<br>
<br><font size=2 face="sans-serif">If you want more info, please contact
me off-line.</font>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
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Jarmo Venalainen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><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 |
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www.SEsolar.com</u></font></a><font size=1 face="Arial"> |
<b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 <br>
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<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Corey Shalanski <cshalanski@joule-energy.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@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">12/16/2014 06:27 PM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">[RE-wrenches] Magnum System - Discharged
Battery Bank</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" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Wrenches,</font>
<br>
<br><font size=3>I visited a customer today whose grid-tied battery backup
system suffered some sort of catastrophic failure, and now I'm trying
to play detective to figure out what happened and whose equipment/design
is to blame.</font>
<br>
<br><font size=3>Here is what I know so far:</font>
<br><font size=3>- System is ac-coupled with a Sunny Boy 7000 (7.85kW array),
Magnum MS4448PAE (x2), 3 strings of 4 12v batts (705Ah total)</font>
<br><font size=3>- Site visit was triggered by the Sunny Boy registering
zero output via online monitoring.</font>
<br><font size=3>- SPST Solid state relay installed on Sunny Boy output,
controlled via Magnum router, serves as secondary overcharge protection
to Magnum's frequency shift feature. Technician who initially responded
claims he measured 240v across the relay's terminals - relay manufacturer
claims this is "100% impossible". We removed the relay from the
circuit, and the Sunny Boy is again operational.</font>
<br><font size=3>- On arrival I found the Magnum display showing a "Low
Battery Charge" message with the bank measuring ~4Vdc. The individual
batteries were in various states of charge, ranging from high of 6.3v to
low of -2.6v. These measurements were taken at rest, all battery cables
disconnected, and yes three of the batts were registering a negative voltage.</font>
<br><font size=3>- Customer reports that he was not aware of any recent
prolonged power outages.</font>
<br>
<br><font size=3>The three potential suspects would seem to be:</font>
<br><font size=3>- SS relay: The customer is convinced that this is the
weak link in the system and somehow triggered this failure. I am not so
convinced but would be interested to hear recommendations for properly
testing its functionality.</font>
<br><font size=3>- Magnum equipment: Since there is low-battery-cutout
protection, why would this feature not have activated and prevented the
batteries from draining so low?</font>
<br><font size=3>- Batteries: I am not very familiar with modes of failure,
but our distributor suggested that an internal short could be a possibility
- what might have triggered this?</font>
<br>
<br><font size=3>Clearly I am fishing for potential leads here, so any
suggestions are welcome.</font>
<br>
<br><font size=3>Thanks!</font>
<br><font size=3>--</font>
<br><font size=3>Corey Shalanski</font>
<br><font size=3>Joule Energy</font>
<br><font size=3>New Orleans, LA</font>
<br><font size=1 color=white>ᐧ</font>
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