<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">I'm assuming the oscilloscope waveforms
are voltages. If so, they don't look bad.</font>
<br>
<br><font size=2 face="sans-serif">I would get a current for the oscilloscope
and and measure the L1, L2 and Neutral currents. That should reveal
what is going on.</font>
<br>
<br><font size=2 face="sans-serif">JARMO <br>
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<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Mac Lewis <maclewis1@gmail.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 <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">07/14/2015 06:01 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] Generac QT series</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>Hello wrenches,</font>
<br>
<br><font size=3>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.</font>
<br>
<br><font size=3>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.</font>
<br><font size=3>The 4 photos are as follows (all photos L1-L2):</font>
<br><font size=3>1. Generator Waveform No Load: Unloaded Generator
Voltage Waveform</font>
<br><font size=3>2. Charger 1st Connected: AC Input Voltage waveform
immediately after charger connects</font>
<br><font size=3>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.</font>
<br><font size=3>4. Zoomed In Ripple: Closer view of the disturbances
noted in #3.</font>
<br>
<br><font size=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. </font>
<br>
<br><font size=3>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.</font>
<br>
<br><font size=3>Your comments or thoughts are appreciated.</font>
<br>
<br><font size=3>Thanks</font>
<br>
<br>
<br>
<br><font size=3>On Tue, Dec 16, 2014 at 11:15 AM, RE Ellison <</font><a href=mailto:reellison@gmail.com target=_blank><font size=3 color=blue><u>reellison@gmail.com</u></font></a><font size=3>>
wrote:</font>
<br><font size=3>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</font>
<br>
<br><font size=3>I run into this in the past they actually had it wired
for 240 into a balancing transformer to feed 120 into the inverter</font>
<br>
<br><font size=3>We could've just left it at 120 volt </font>
<br>
<br><font size=3>Later,</font>
<br><font size=3>Bob ellison <br>
<br>
</font>
<br><font size=3>Bob Ellison</font>
<br><font size=3><br>
On Dec 16, 2014, at 11:33 AM, "Baxter, Gary" <</font><a href=mailto:gbaxter@sensata.com target=_blank><font size=3 color=blue><u>gbaxter@sensata.com</u></font></a><font size=3>>
wrote:<br>
</font>
<br><font size=3>Hi Mac,</font>
<br><font size=3>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.</font>
<br>
<br><font size=3>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.</font>
<br>
<br><font size=3>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 </font>
<br><font size=3>Product Manager</font>
<br><font size=3>Magnum/Dimensions </font>
<br><font size=3><br>
On Dec 15, 2014, at 12:12 PM, Mac Lewis <</font><a href=mailto:maclewis1@gmail.com target=_blank><font size=3 color=blue><u>maclewis1@gmail.com</u></font></a><font size=3>>
wrote:<br>
</font>
<p><font size=3>Hi jarmo,</font>
<p><font size=3>We have verified this is split phase 120/240. My multimeter
gets 120 L-N and 240 L-L.</font>
<p><font size=3>Thanks</font>
<p><font size=3>On Dec 15, 2014 10:25 AM, <</font><a href="mailto:Jarmo.Venalainen@schneider-electric.com" target=_blank><font size=3 color=blue><u>Jarmo.Venalainen@schneider-electric.com</u></font></a><font size=3>>
wrote:</font>
<br><font size=3 face="sans-serif">Hi:</font><font size=3> <br>
</font><font size=3 face="sans-serif"><br>
The Generac QT02224GNAX ships as a three-phase 120/208 VAC. I believe
the Magnum is a 120/240 VAC.</font><font size=3> <br>
</font><font size=3 face="sans-serif"><br>
JARMO</font><font size=3 color=#008000><br>
_____________________________________________________________________________________</font><font size=3>
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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 &
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<td width=13%><font size=1 color=#5f5f5f face="sans-serif">From:</font><font size=3>
</font>
<td width=86%><font size=1 face="sans-serif">Mac Lewis <</font><a href=mailto:maclewis1@gmail.com target=_blank><font size=1 color=blue face="sans-serif"><u>maclewis1@gmail.com</u></font></a><font size=1 face="sans-serif">></font><font size=3>
</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">To:</font><font size=3>
</font>
<td><font size=1 face="sans-serif">RE-wrenches <</font><a href="mailto:re-wrenches@lists.re-wrenches.org" target=_blank><font size=1 color=blue face="sans-serif"><u>re-wrenches@lists.re-wrenches.org</u></font></a><font size=1 face="sans-serif">>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font><font size=3>
</font>
<td><font size=1 face="sans-serif">12/15/2014 05:52 AM</font><font size=3>
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font><font size=3>
</font>
<td><font size=1 face="sans-serif">[RE-wrenches] Generac QT series</font><font size=3>
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font><font size=3>
</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <</font><a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target=_blank><font size=1 color=blue face="sans-serif"><u>re-wrenches-bounces@lists.re-wrenches.org</u></font></a><font size=1 face="sans-serif">></font></table>
<br><font size=3><br>
</font>
<hr noshade><font size=3><br>
<br>
<br>
Hello wrenches, <br>
<br>
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.
<br>
<br>
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. <br>
<br>
Thanks in advance <br>
<br>
-- <br>
<br>
<br>
<br>
Mac Lewis</font>
<p><font size=3 color=#37605e>"Yo solo sé que no sé nada." </font><font size=3 color=#5f5f5f>-Sócrates</font><font size=3>
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