<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">Xantrex did some early work on generator
with inverter compatibility back in 2007. AC coupling PV to generators
was very new back then and we wanted to find the benefit of using a battery
based inverter to reduce the run time of generators. One system was
a small 5kW off-grid house and the second a 90kW generator running a couple
of dozen homes. For the trial is set up with power monitoring for
back-feed and much more.</font>
<br>
<br><font size=2 face="sans-serif">The systems are still running. Here
are a few training slides which summarize the results and a link to the
archived study from 2007 at the Natural Resources Canada.</font>
<br>
<br>
<br>
<br><a href="http://www.nrcan.gc.ca/energy/publications/sciences-technology/renewable/solar-photovoltaic/6215"><font size=2 color=blue face="sans-serif">http://www.nrcan.gc.ca/energy/publications/sciences-technology/renewable/solar-photovoltaic/6215</font></a>
<br>
<br><font size=2 face="sans-serif">The bullet form summary is:</font>
<br>
<br><font size=2 face="sans-serif">- The smaller the generator, the large
the savings whether you grid tie to the generator or use a battery based
inverter to reduce generator run time. </font>
<br><font size=2 face="sans-serif">- PV is not needed to get the bulk of
the savings in systems using battery based inverters to reduce run time
of small generators.</font>
<br>
<br><font size=2 face="sans-serif">JARMO</font>
<br>
<br>
<br><font size=3>On Oct 28, 2014 4:48 AM, "Corey Shalanski" <</font><a href="mailto:cshalanski@joule-energy.com"><font size=3 color=blue><u>cshalanski@joule-energy.com</u></font></a><font size=3>>
wrote:</font>
<br><font size=3>Wrenches,</font>
<br>
<br><font size=3>We frequently encounter residences with backup generators.
The question that arises: how should the PV system be interconnected?</font>
<br>
<br><font size=3>I have searched the archives and found some good information
about this subject, but nothing definitive. I have fallen into the habit
of broadly proclaiming that the PV system *must* be interconnected on the
"utility" side of the transfer switch - in order to prevent backfeeding
into the generator and thereby eliminate unintentional equipment damage.
Is this concern justified? If so, should this be an absolute rule or would
it depend on the generator make/model?</font>
<br>
<br><font size=3>Thanks for any insights.</font>
<br>
<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=3><br>
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