[RE-wrenches] PV Production Meter on a XW System

Sat Aug 25 06:17:21 PDT 2012

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:reosolar at gmail.com>reosolar at gmail.com
>www.reosolar.com
>
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>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:reosolar at gmail.com>reosolar at gmail.com
>>>>www.reosolar.com
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