Hi Mac What does magnum have to say?
( we've never seen this before?) I don't understand what is going on, but I had a similar problem told to me and fixed with using a transformer. Yes just running the AC in and out but it worked. Good luck Jay > On Jul 14, 2015, at 6:01 AM, Mac Lewis <[email protected]> wrote: > > Hello wrenches, > > 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. > > 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. > The 4 photos are as follows (all photos L1-L2): > 1. Generator Waveform No Load: Unloaded Generator Voltage Waveform > 2. Charger 1st Connected: AC Input Voltage waveform immediately after > charger connects > 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. > 4. Zoomed In Ripple: Closer view of the disturbances noted in #3. > > 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. > > 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. > > Your comments or thoughts are appreciated. > > Thanks > > > _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
