<div dir="ltr">Hello wrenches,<div><br></div><div>Last December I posted about a Magnum 4448 and a Generac 22 kW generator that aren't working well together. The symptom was that the Magnum transformer would overheat very quickly, even at very low charge rates (<2A DC). We have verified 120/240 VAC operation of the generator.</div><div><br></div><div>We were able to get up to the site with an oscilloscope and see if we could find anything out. I've attached some photos of the oscilloscope output. I don't have anything to compare it to, so I'd like to see if anyone has some insight into why this may be occurring.</div><div>The 4 photos are as follows (all photos L1-L2):</div><div>1. Generator Waveform No Load: Unloaded Generator Voltage Waveform</div><div>2. Charger 1st Connected: AC Input Voltage waveform immediately after charger connects</div><div>3. Steady State Operation Editted: AC Input Voltage waveform after about 10 seconds, this waveform continues until transformer overheats (in about 2 minutes) Note the disturbances.</div><div>4. Zoomed In Ripple: Closer view of the disturbances noted in #3.</div><div><br></div><div>We have tried replacing the Magnum with an identical unit, and we had the same issue. We also tried a Honda 6500 with atrocious voltage and frequency regulation and it worked fine with the Magnum. Since I did not sell him the generator, the easy out is to replace the generator. However, there is some custom exhaust duct work and it will be much more expensive to replace the generator than to try a new inverter. </div><div><br></div><div>I think that over all it is preferable for the client to replace the inverter/charger with a different brand. I have no problem doing that except that I'd like to be relatively sure that this is anomalous behavior between the Magnum and the Generac and not a generator issue. What are the chances that I'd have the same issue with a different inverter? What might cause this? All voltage and frequency measurements have been perfect with the Generac.</div><div><br></div><div>Your comments or thoughts are appreciated.</div><div><br></div><div>Thanks</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 16, 2014 at 11:15 AM, RE Ellison <span dir="ltr"><<a href="mailto:reellison@gmail.com" target="_blank">reellison@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div>If memory serves me correctly and this is the off grid Generac they are available as a 120 volt and it takes a new breaker and rewiring to get 120 / 240 out of them</div><div><br></div><div>I run into this in the past they actually had it wired for 240 into a balancing transformer to feed 120 into the inverter</div><div><br></div><div>We could've just left it at 120 volt </div><div><br></div><div>Later,</div><div>Bob ellison <br><br><br><div>Bob Ellison</div></div><div><div class="h5"><div><br>On Dec 16, 2014, at 11:33 AM, "Baxter, Gary" <<a href="mailto:gbaxter@sensata.com" target="_blank">gbaxter@sensata.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
<div>Hi Mac,</div>
<div>Jay just had the same issue and it was 120v from the gen instead of 120/240. The inverter was charging using half the windings causing it to Overtemp.</div>
<div><br>
</div>
<div>Check the 60A breakers on the side of the inverter. Also make sure to remove the wires from the input terminal block before measuring voltage as the inverter will make 120v look like 120/240v at the terminals.</div>
<div><br>
</div>
<div>If the generator is 3 Phase it won't work with this inverter unless you only use one leg. This will work but you will need to turn the charge rate to 50% in order to prevent Overtemp. Sometimes it works as high as 70%.<br>
<br>
Gary Baxter
<div>Product Manager</div>
<div>Magnum/Dimensions </div>
</div>
<div><br>
On Dec 15, 2014, at 12:12 PM, Mac Lewis <<a href="mailto:maclewis1@gmail.com" target="_blank">maclewis1@gmail.com</a>> wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<p dir="ltr">Hi jarmo,</p>
<p dir="ltr">We have verified this is split phase 120/240. My multimeter gets 120 L-N and 240 L-L.</p>
<p dir="ltr">Thanks</p>
<div class="gmail_quote">On Dec 15, 2014 10:25 AM, <<a href="mailto:Jarmo.Venalainen@schneider-electric.com" target="_blank">Jarmo.Venalainen@schneider-electric.com</a>> wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<font face="sans-serif">Hi:</font> <br>
<br>
<font face="sans-serif">The </font><font size="3" face="sans-serif">Generac QT02224GNAX</font><font face="sans-serif"> ships as a three-phase 120/208 VAC. I believe the Magnum is a 120/240 VAC.</font>
<br>
<br>
<font face="sans-serif">JARMO<br>
</font><font size="3" color="#008000">_____________________________________________________________________________________</font><font size="3">
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</font><font size="1" face="Arial"><b><br>
Jarmo Venalainen</b> | </font><font size="1" color="#008000" face="Arial"><b> Schneider Electric
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<td><font size="1" color="#5f5f5f" face="sans-serif">From:</font> </td>
<td><font size="1" face="sans-serif">Mac Lewis <<a href="mailto:maclewis1@gmail.com" target="_blank">maclewis1@gmail.com</a>></font>
</td>
</tr>
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<td><font size="1" color="#5f5f5f" face="sans-serif">To:</font> </td>
<td><font size="1" face="sans-serif">RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>>,
</font></td>
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<td><font size="1" color="#5f5f5f" face="sans-serif">Date:</font> </td>
<td><font size="1" face="sans-serif">12/15/2014 05:52 AM</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] Generac QT series</font> </td>
</tr>
<tr valign="top">
<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" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>></font></td>
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<br>
<hr noshade>
<br>
<br>
<br>
<font size="3">Hello wrenches,</font> <br>
<br>
<font size="3">We have a newly installed system that has a 22 kW Generac Quiet Source </font><font size="3" face="sans-serif">QT02224GNAX</font><font size="3"> with a Magnum MS4448-PAE. When we start the generator, the Magnum's internal transformer temperature
climbs to overtemp (240F) within a 2 minutes. The batteries are being floated at the time, and haven't seen more than 5A coming out of the generator. We swapped the Magnum out, and we have the exact same issue. We then got a job-site gas generator 6500W
and ran it. No problem whatsoever. The problem appears to be with the Generac, or with the interaction between the Generac & the Magnum. I didn't have a scope on site but the fluke multimeter doesn't detect anything wrong with the voltage or frequency coming
from the Generac.</font> <br>
<br>
<font size="3">Has anyone had issues with the Generac QT? Anyone paired one with a Magnum PAE before? I want to get my scope up there and look for triplen harmonics, but I'm not sure how to filter these out. Any references on how to effectively do that is
appreciated.</font> <br>
<br>
<font size="3">Thanks in advance</font> <br>
<br>
<font size="3">-- </font><br>
<br>
<br>
<br>
<font size="3">Mac Lewis<br>
</font>
<p><font color="#37605e">"Yo solo sé que no sé nada." </font><font color="#5f5f5f">-Sócrates</font>
</p>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:'Times New Roman';font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left"><font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo sé que no sé nada." </font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Sócrates</font></span></span></span></font></p></font></b></span></div>
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