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.
At 02:23 PM 8/24/2012, you wrote:
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.
Aaron Mandelkorn
NABCEP Certified PV Installer
Owner / Operator
Renewable Energy Outfitters
Box 65 Salida, CO. 81201
(970)596-3744
<mailto:reoso...@gmail.com>reoso...@gmail.com
www.reosolar.com
On Aug 24, 2012, at 11:05 AM, Gary Willett wrote:
Aaron:
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.
My electric service has a bi-directional "smart" utility meter that
presents a cyclic display of kWh delivered (code 20) and received (code 57).
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.
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.
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.
Regards, Gary Willett, PE
On 8/24/2012 10:44 AM, Kent Osterberg wrote:
Aaron,
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.
Kent Osterberg
Blue Mountain Solar, Inc.
<http://www.bluemountainsolar.com/>www.bluemountainsolar.com
t: 541-568-4882On 8/24/2012 7:29 AM, Aaron Mandelkorn wrote:
Wrenches,
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.
Aaron Mandelkorn
NABCEP Certified PV Installer
Owner / Operator
Renewable Energy Outfitters
Box 65 Salida, CO. 81201
(970)596-3744
<mailto:reoso...@gmail.com>reoso...@gmail.com
www.reosolar.com
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