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Just musing here, Mark,<br>
What if the coil of the contactor was energized by the grid. The
benefit is that grid goes down and so does theinverter; grid goes up
and the inverter waits 5 min, long enough for the ATS to transfer
back to grid. I can see two downsides: 1) the continuous tiny load
of the contactor coil, and 2) you would have to run signal cable
from the grid point on the ATS (or ahead of it) to the contactor at
the inverter.'s point of connection to AC.<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></p>
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<br>
On 9/26/2010 1:31 PM, Mark Frye wrote:
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<p><font size="2" face="Arial">Folks,</font> </p>
<p><font size="2" face="Arial">I am looking at doing a standard
grid-dependent PV installation. The only catch is that the
whole house is backed up by a generator with automatic tranfer
switch.</font></p>
<p><font size="2" face="Arial">Due to the layout of the various
equipment, it would be a whole lot easier to interconnect the
PV at a point downstream of the ATS. Because the ATS takes a
minute or so to bring the generator up and transfer, the
inverter would drop out when the line is lost. If I had a
contactor on inverter output, with the coil held by line
voltage and a reset switch, I could set it up so that the
inverter output would be isolated from the generator upon line
voltage loss, and manually reset once utility line voltage was
restored.</font></p>
<p><font size="2" face="Arial">I am wondering about the following
4 considerations:</font> </p>
<p><font size="2" face="Arial">1 - Code / AHJ acceptablity: Does
the Code address the issue of load side connection downstream
of an ATS?</font> <br>
<font size="2" face="Arial">2 - Utility (PG&E)
acceptability: I don't see how the utility would care.</font>
<br>
<font size="2" face="Arial">3 - Inverter manufacturer
acceptability: The manufacturer might not warrant this
application unless they were confortable that the inverter
never sees generator voltage.</font></p>
<p><font size="2" face="Arial">4 - Functional efficacy: Owner
would have to reset inverters manually.</font> </p>
<p><font size="2" face="Arial">Has anyone worked throught this
scenario?</font> <br>
<font face="Arial"> </font> <br>
<font size="2" face="Arial">Mark Frye</font> <br>
<font size="2" face="Arial">Berkeley Solar Electric Systems</font>
<br>
<font size="2" face="Arial">303 Redbud Way</font> <br>
<font size="2" face="Arial">Nevada City, CA 95959</font> <br>
<font size="2" face="Arial">(530) 401-8024</font> <br>
<a moz-do-not-send="true" href="http://www.berkeleysolar.com"><u><font
size="2" color="#0000ff" face="Arial">www.berkeleysolar.com</font></u></a><font
size="2" face="Arial"> </font> </p>
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