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<DIV><FONT face=Arial>Morning William,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>regarding 1--</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Don't know what your net-metering application form
requires, but in VA the installing company has to certify/ sign off on the
equipment meeting 1741. Years ago, after y2k, we had a Co-op so eager to show
their support for net metering, that their people , after inspecting the system
and testing the loss off grid transfer function by pulling the meter, signed the
forms themselves. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>As for 2, from our experience with the local IOU, be
careful when mentioning a motor-driven generator. They don't understand that the
XW can't sell that power--directly-- to the grid. Since the cat is out of the
bag, I think you'll need to show that the gen set only charges the battery and
passes thru the XW to the dedicated loads.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>May be simpler not to mention generator?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Ken</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=william@millersolar.com href="mailto:william@millersolar.com">William
Miller</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 26, 2009 2:12
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Battery based
grid tie question.</DIV>
<DIV><BR></DIV><FONT size=3>Colleagues:<BR><BR>Interesting that this topic
comes up at this time:<BR><BR>1. We inherited a grid-tie project wherein an
elderly client was sold an SW installation some years ago. Come to find
out, the installer never filed anything with the utility. The client was
caught recently back-feeding without permission by a meter reader and told to
cease and desist. We filed an application with the utility thinking this
was a long shot since the client's SW inverter did not have the requisite
Grid-tie Interface (GTI). We have several GTIs sitting on the shelf, but
the inverter does not have the proper interface so one could not be
installed. Lo and behold, the utility approved this installation for
interconnection.<BR><BR>2. We have an application to the local utility
(PG&E) pending for a three XW installation with a motor-generator.
We have received multiple communications from PG&E doubting the
acceptability of the XW system for use as a gird-tied battery-back up
system. We are hoping that PG&E accepts the listings from the
various agencies and approves the project.<BR><BR>Interesting that the old,
non-complaint system receives swift approval but the latest and greatest gear
hits a regulatory road block! We'll keep you posted.<BR><BR>William
Miller<BR><BR><BR>At 04:56 PM 3/25/2009, you wrote:<BR></FONT>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT face=arial color=#0000ff
size=2>What year are the SWs? they have had grid inter tie for years, if the
inverters were manufactured prior to I think 2001 then you do not need to
have the gti box installed. If the guys on a budget why spend
the extra $$$$? Its not the most efficient it certainly cheaper. <BR></FONT>
<DL>
<DD><FONT face=tahoma size=2>-----Original Message-----<BR>
<DD>From:</B> re-wrenches-bounces@lists.re-wrenches.org [<A
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
eudora="autourl">mailto:re-wrenches-bounces@lists.re-wrenches.org</A>] On
Behalf Of </B>robert ellison<BR>
<DD>Sent:</B> Wednesday, March 25, 2009 9:39 AM<BR>
<DD>To:</B> RE-wrenches<BR>
<DD>Subject:</B> [RE-wrenches] Battery based grid tie
question.<BR><BR></FONT>
<DD><FONT size=3>On a similar question to what works well together. I am
rebuilding the wind side of an old off grid system that the new owner has
brought the grid in. He wants to grid tie the system. Another dealer is
doing the solar side of things.<BR>
<DD>My thoughts are the 48 volt SW inverters need to go, and replace them
with Outback 48 volt grid tie units and have the wind keep the battery up.
Am I correct that when the batteries are full from what ever source the
outbacks will grid connect and net meter any excess power to the grid?
Seems that I remember that they will but almost never get a call for grid
tie up here in the sticks so I figured I would ask the knowledge base.<BR>
<DD><BR>
<DD>I would suggest he keep the SW inverters to generator charge in case
of a long power outage as last I knew the Outbacks (FX) did not care for
generator power.<BR>
<DD><BR>
<DD>I could probably research it but the list is faster and probably more
accurate that reading all the manuals with all my free time these
days!<BR>
<DD><BR>
<DD>Needless to say the fellow in on a budrgt and the power company
brought the power into the main building not the power house. Can't make
things easy......<BR>
<DD><BR>
<DD>Thanks,<BR>
<DD>Bob<BR><BR>
<DD>2009/3/23 <<A
href="mailto:I2P@aol.com">I2P@aol.com</A>><BR></FONT>
<DD><FONT face=arial size=2>Wrenches,<BR>
<DD><BR>
<DD>I have been doing some experimenting --testing compatibility between
brands of grid tie inverters and sign wave battery type inverters. I am
hoping some of you also have some experience here and we can compare
results.<BR>
<DD><BR>
<DD>My interest is fueled by my belief that AC coupling is the ideal way
to increase system capacity for battery based off grid systems. The
primary benefit is higher system efficiency for AC loads used during the
day. I realize that power management becomes important but my interest
right now is just to find out who talks to who. My ultimate "power
management" tool will be an electric vehicle. Charging it will undoubtedly
suck up available juice.<BR>
<DD><BR>
<DD>So far:<BR>
<DD><BR>
<DD>SMA synchronizes to Xantrex SW (have not tested the XW yet) and
Outback and of course the SMA Sunny Island<BR>
<DD><BR>
<DD>Xantrex GT also syncs to the SW<BR>
<DD><BR>
<DD>I started this project with Enphase as my first choice since their
system is so scaleable. I have been unable to make Enphase sync. Marv at
Enphase has been very helpful but to date no results. I have, at
Marv's suggestion ,used capacitors to clean the somewhat hashy SW output
without results. Marv tells me he is testing Enphase and Outback. Does
anyone have experience syncing Enphase to other offgrid inverters?<BR>
<DD><BR>
<DD>Any experiences with Fronius and others.? <BR>
<DD><BR>
<DD>Though the SW output is not the cleanest, the results with SB and GT
are very stable. They hookup early AM and its steady green light all day
long. Though I use microwave, start induction motors etc, and my scope
clearly shows lots of spikes during these events, the GT and SB hang
in.<BR>
<DD><BR>
<DD>What are the experiences from others regarding mix and match?.
Interoperability among brands seems to be a very desirable goal to this
wrench.<BR>
<DD><BR>
<DD>Don Loweburg<BR>
<DD>Offline Solar, Inc</FONT> </DD></DL></BLOCKQUOTE>
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