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You can also use a couple of rebuilt meters from Hialeah Meter company
that read both ways. On the AC IN, the power that is sold to and
purchased from the grid will add / subtract to let you know the amount
you sold or bought. The meter to the protected loads panel will
register one way to let you know how much power was consumed there.
If you sold more power than you purchased, you can add that to the
protected loads panel production. If you purchased more, subtract
that to find your PV production.<br><br>
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At 02:23 PM 8/24/2012, you wrote:<br>
<blockquote type=cite class=cite cite="">Great explanation gary. I
was thinking that between the AC1 and breaker in the main panel was the
right place but wasn't sure. Thanks for the help.<br><br>
Aaron Mandelkorn<br>
NABCEP Certified PV Installer<br>
Owner / Operator<br><br>
Renewable Energy Outfitters<br>
Box 65 Salida, CO. 81201<br>
(970)596-3744<br>
<a href="mailto:reosolar@gmail.com">reosolar@gmail.com</a><br>
<a href="http://www.reosolar.com/" eudora="autourl">www.reosolar.com</a>
<br><br>
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On Aug 24, 2012, at 11:05 AM, Gary Willett wrote:<br><br>
<blockquote type=cite class=cite cite=""><font size=4>Aaron:<br><br>
Manually-read legacy utility meters, in many cases, are set up to
accumulate current flow in either direction as kWh consumed. This was
done because dishonest people would turn the meter upside down for part
of the month, and then put it back normal before the meter-reader showed
up.<br><br>
My electric service has a bi-directional "smart" utility meter
that presents a cyclic display of kWh delivered (code 20) and received
(code 57).<br><br>
For my GTBB system, I use a GE KV2c bi-directional meter between the XW
AC1 conductors and the grid interactive back-fed PV breaker. This
provides a separate register for the kWh "bought" and the kWh
"sold" from the XW's perspective. <br><br>
The XW inverter AC output feeds a protected loads panel, which in my case
contains everything except the electric oven and the electric dryer. My
3-ton AC unit runs off the XW inverter under grid-up, but is switched off
via a contactor when in grid-down. I have an autostart 6kW Generac EcoGen
connected to the XW AC2 for back-up in event of an extended grid
outage.<br>
</font><br>
<font size=4>The KV2c "bought" register accumulates the kWh
consumed when the XW is in AC Pass-Thru mode or grid supplement mode (PV
kW not adequate to deliver load demand). The KV2c "sold"
register accumulates the kWh delivered by the XW to the main service
panel. Some of these kWs power my 240V loads if they are
active.</font><br>
<font size=4><br>
</font>Regards, Gary Willett, PE<br><br>
<br>
On 8/24/2012 10:44 AM, Kent Osterberg wrote:<br>
<blockquote type=cite class=cite cite="">Aaron,<br><br>
Is the objective to measure all of the energy produced or only that which
is delivered to the grid? To measure the energy sold to the grid, the
meter goes between the XW and the grid, but it must be an electronically
detented meter that only records energy flow in one direction.<br><br>
<pre>Kent Osterberg
Blue Mountain Solar, Inc.
<a href="http://www.bluemountainsolar.com/">www.bluemountainsolar.com</a>
t: 541-568-4882</pre><font face="Courier New, Courier"></font>On
8/24/2012 7:29 AM, Aaron Mandelkorn wrote:<br>
<blockquote type=cite class=cite cite="">Wrenches,<br><br>
I would like to here some thoughts on monitoring the production a XW in
grid tie with battery backup mode. I normally use the Sunny Island for my
grid tie with battery backup systems and am considering going with the XW
on my next one. Just wondering where in the system one would wire
the AC PV Production meter to best represent the amount of power sold to
the grid. We have performance based incentives around here that
require metering of the power going back to the grid. With the SI
systems this is easily accomplished by putting the required meter after
the sunny boy before going to the critical loads panel. Any ideas
about how to accomplish this with the DC coupled XW system? Your thoughts
would be greatly appreciated. <br><br>
Aaron Mandelkorn<br>
NABCEP Certified PV Installer<br>
Owner / Operator<br><br>
Renewable Energy Outfitters<br>
Box 65 Salida, CO. 81201<br>
(970)596-3744<br>
<a href="mailto:reosolar@gmail.com">reosolar@gmail.com</a><br>
<a href="http://www.reosolar.com/" eudora="autourl">www.reosolar.com</a>
<br><br>
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