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<DIV><SPAN class=234383801-18022010><FONT color=#0000ff size=2 face=Arial>I have
been told by SMA to connect the inverter upstream (utility side)
<DIV> </DIV> of the ATS if it is feasable.</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV align=left><STRONG><EM> </EM></STRONG></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px" dir=ltr>
<DIV></DIV>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left><FONT size=2
face=Tahoma>-----Original Message-----<BR><B>From:</B>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>jay
peltz<BR><B>Sent:</B> Monday, February 15, 2010 10:42 AM<BR><B>To:</B>
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] anti
islanding?<BR><BR></FONT></DIV>Hi Nick,
<DIV><BR></DIV>
<DIV>The usual answer is this is a bad idea for the generator.</DIV>
<DIV>The only exceptions I know of are if the solar is a small
percentage of the generator size, then its "probably" OK on the
generator.</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>jay </DIV>
<DIV>peltz power</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>
<DIV>
<DIV>On Feb 15, 2010, at 7:27 AM, Nick Soleil wrote:</DIV><BR
class=Apple-interchange-newline>
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<DIV>
<DIV
style="MARGIN: 0px; FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 12pt">I
have a couple of projects coming up, which will require additional
work to prevent connecting to a Generac Guardian's ATS panels. Do the
same concerns still exist regarding back-feeding an inverter to a generator
panel? Can the inverter damage the generator? I know this was
the cases, at least theoretically. Should I continue to be
concerned?<BR>
<DIV style="MARGIN: 0px"> </DIV>Nick Soleil<BR>Project
Manager<BR>Advanced Alternative Energy Solutions, LLC<BR>PO Box
657<BR>Petaluma, CA 94953<BR>Cell: 707-321-2937<BR>Office:
707-789-9537<BR>Fax: 707-769-9037
<DIV style="MARGIN: 0px"><BR></DIV>
<DIV
style="MARGIN: 0px; FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 12pt"><BR>
<DIV
style="MARGIN: 0px; FONT-FAMILY: arial, helvetica, sans-serif; FONT-SIZE: 10pt"><FONT
size=2 face=Tahoma>
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B><SPAN
class=Apple-converted-space> </SPAN>Darryl Thayer <<A
href="mailto:daryl_solar@yahoo.com">daryl_solar@yahoo.com</A>><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B><SPAN
class=Apple-converted-space> </SPAN>RE-wrenches <<A
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</A>><BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B><SPAN
class=Apple-converted-space> </SPAN>Sat, February 13, 2010 5:51:33
PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B><SPAN
class=Apple-converted-space> </SPAN>Re: [RE-wrenches] anti
islanding?<BR></FONT><BR>Hi August<BR>I felt I was a little to cryptic in my
answer, so here is a longer answer.<BR><BR><BR>The inverter always tries to
increase the frequency if it is connected to a grid, it could never speed up
all those billions of tons of rotating equipment, so the frequency stays the
same. If two inverters see themselves they will both try to increase
the frequency, they will succeed and if the frequency is greater than the
60.5 HZ the inverter shuts off. If there is a load that can stabilize
frequency such as a synchronous motor they will either speed up the motor or
they will not be able and the motor will slow down. Either way the
frequency changes and the inverter shuts down for frequency out of
specification which is <60.5 or >59.3 else the inverter shuts
down. <SPAN class=Apple-converted-space> </SPAN><BR><BR>The
inverter also looks at a voltage, and to sell power it wants to raise
voltage, necessary to put power into the grid. Unless the load exactly
matches the inverter power the voltage will rise or fall if the load is to
large and it will fall out of voltage specification shutting the inverter
down. <SPAN class=Apple-converted-space> </SPAN><BR><BR>One Last
feature, the inverter is voltage commutated, and it looks for voltage to add
its power to. if you had purely a resistive load, both inverters would wait
for the voltage from the other inverter, and nothing would get done.
<SPAN class=Apple-converted-space> </SPAN><BR><BR><BR><BR>Think
of it this way, for the system to last for 10 seconds, the speed of this
strange device (synchronus motor) cannot change speed more than 0.5% per 10
second and it would coast for 30 minutes before stopping, and this motor
would have to be doing no work.<SPAN
class=Apple-converted-space> </SPAN><BR><BR>--- On Sat, 2/13/10, August
Goers <<A href="mailto:august@luminalt.com"
ymailto="mailto:august@luminalt.com">august@luminalt.com</A>>
wrote:<BR><BR>> From: August Goers <<A
href="mailto:august@luminalt.com"
ymailto="mailto:august@luminalt.com">august@luminalt.com</A>><BR>>
Subject: [RE-wrenches] anti islanding?<BR>> To: "RE-wrenches"
<<A href="mailto:re-wrenches@lists.re-wrenches.org"
ymailto="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</A>><BR>>
Date: Saturday, February 13, 2010, 10:29 AM<BR>> Hi
Wrenches,<BR>><SPAN class=Apple-converted-space> </SPAN><BR>>
Does anyone know where I can go to read about general<BR>> information on
how grid tied inver anti islanding works? I'd<BR>> like to be able to
describe this in better detail to our<BR>> tech-savvy clients.<SPAN
class=Apple-converted-space> </SPAN><BR>><SPAN
class=Apple-converted-space> </SPAN><BR>> Thanks,<BR>><SPAN
class=Apple-converted-space> </SPAN><BR>> August<BR>><SPAN
class=Apple-converted-space> </SPAN><BR>><SPAN
class=Apple-converted-space> </SPAN><BR>> August Goers<BR>><SPAN
class=Apple-converted-space> </SPAN><BR>> Luminalt Energy
Corporation<BR>> O: 415.564.7652<BR>> M: 415.559.1525<BR>> F:
650.244.9167<BR>><SPAN class=Apple-converted-space> </SPAN><A
href="http://www.luminalt.com" target=_blank>www.luminalt.com</A><BR>>
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