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

Drake drake.chamberlin at redwoodalliance.org
Mon Aug 27 06:38:44 PDT 2012 

Is the E-Guage a revenue rated meter, acceptable for selling S-RECs?

At 10:03 AM 8/25/2012, you wrote:
>But you can use one e-Guage to look at 6 different current flows. 
>The e-guage has 12 CT inputs, and shows all the data online.
>
>On Sat, Aug 25, 2012 at 9:17 AM, Drake 
><<mailto:drake.chamberlin at redwoodalliance.org>drake.chamberlin at redwoodalliance.org> 
>wrote:
>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
>><tel:%28970%29596-3744>(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: <tel:541-568-4882>541-568-4882
>>>>On 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
>>>>><tel:%28970%29596-3744>(970)596-3744
>>>>><mailto:reosolar at gmail.com>reosolar at gmail.com
>>>>>www.reosolar.com
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
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>--
>Chris Mason
>President, Comet Systems Ltd
><http://www.cometenergysystems.com>www.cometenergysystems.com
>Cell: 264.235.5670
>Skype: netconcepts
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