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<div>Good point on the battery monitor. It would be easy to add a Magnum BMK to system and get the battery history. Also the ARC (advanced remote control) stores fault history so you can see when the LBCO occurred along with battery voltage etc.</div>
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Gary Baxter
<div>Product Manager</div>
<div>Magnum/Dimensions </div>
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On Dec 17, 2014, at 11:27 AM, "<a href="mailto:Jarmo.Venalainen@schneider-electric.com">Jarmo.Venalainen@schneider-electric.com</a>" <<a href="mailto:Jarmo.Venalainen@schneider-electric.com">Jarmo.Venalainen@schneider-electric.com</a>> wrote:<br>
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<div><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>
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<br>
<font size="2" face="sans-serif">If you want more info, please contact me off-line.</font>
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<br>
<font size="2" face="sans-serif">JARMO<br>
</font><font size="3" color="#008000">_____________________________________________________________________________________</font><font size="3">
<br>
</font><font size="1" face="Arial"><b><br>
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>
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<b><br>
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<td><font size="1" color="#5f5f5f" face="sans-serif">From:</font> </td>
<td><font size="1" face="sans-serif">Corey Shalanski <<a href="mailto:cshalanski@joule-energy.com">cshalanski@joule-energy.com</a>></font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">To:</font> </td>
<td><font size="1" face="sans-serif"><a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>,
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<td><font size="1" color="#5f5f5f" face="sans-serif">Date:</font> </td>
<td><font size="1" face="sans-serif">12/16/2014 06:27 PM</font> </td>
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<td><font size="1" color="#5f5f5f" face="sans-serif">Subject:</font> </td>
<td><font size="1" face="sans-serif">[RE-wrenches] Magnum System - Discharged Battery Bank</font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">Sent by:</font> </td>
<td><font size="1" face="sans-serif">"RE-wrenches" <<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>></font></td>
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<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>
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<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>
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<br>
<font size="3">Clearly I am fishing for potential leads here, so any suggestions are welcome.</font>
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<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> <br>
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