<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hey Mac,<div class=""><br class=""></div><div class="">We have installed many Magnum inverters in power systems that use home standby (like the Generac), RV style and all kinds of portable generators and have never experienced this issue. I have a Scopemeter also and have seen far worse waveform distortions than you are showing in the photos so I believe your problem is not as simple as the sine waveform. </div><div class=""><br class=""></div><div class="">From the cost standpoint, I’de guess you have to try a different brand inverter first. However, since the problem only occurs with that particular generator, I would not trust it. </div><div class=""><br class=""><div apple-content-edited="true" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Larry Crutcher<br class="">Starlight Solar Power Systems<br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""></div></div></div>
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<br class=""><div><div class="">On Jul 14, 2015, at 6:01 AM, Mac Lewis <<a href="mailto:maclewis1@gmail.com" class="">maclewis1@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hello wrenches,<div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">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 class="">The 4 photos are as follows (all photos L1-L2):</div><div class="">1. Generator Waveform No Load: Unloaded Generator Voltage Waveform</div><div class="">2. Charger 1st Connected: AC Input Voltage waveform immediately after charger connects</div><div class="">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 class="">4. Zoomed In Ripple: Closer view of the disturbances noted in #3.</div><div class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">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 class=""><br class=""></div><div class="">Your comments or thoughts are appreciated.</div><div class=""><br class=""></div><div class="">Thanks</div><div class=""><br class=""></div><div class=""><br class=""></div></div><div class="gmail_extra"><br class=""></div></div></div><br class=""></div></body></html>