Grid-Tied SW output meter [RE-wrenches]

[William Korthof]

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I had an idea for this situation... for an installation with one
SW inverter (120 Vac only) perhaps a single meter could
be used to measure both outputs from the inverter---use
the "line 1" side of the meter for the grid side of the meter
and "line 2" for the load side. I think it would need to be a
mechanical type meter with a neutral coil connection
(ie, "single phase" meter for use on 120/208 3-phase).
The neutral connection should allow the two lines to be
measured properly and independently, whether they are
in phase (normal operation), or otherwise (grid off, grid
frequency error...).

/wk

At 10:57 AM 3/12/03 -0800, you wrote:
>The new CEC guidelines require a "System Performance Meter" for grid tied 
>systems which receive their final after March 31, 2003. We occasionally 
>use an SW with back-up batteries to serve a critical load sub-panel. I 
>think this is how we can meter both the output going to the critical loads 
>as well as the main panel/grid during daytime energy production and 
>account for power the inverter will feed through from the grid at night. 
>One kWh meter on the grid AC IN 1 side of the inverter and another on the 
>AC Out to the critical loads. Total output equals the total of both of 
>them. The grid power used for the AC Out loads will be subtracted from the 
>AC In meter which cancels the amount added to the AC Out meter.
>
>Does this make sense and/or is there an easier way to do this?
>
>Thanks,
>--
>David Henry
>Harmony Farm Supply
>3244 Hwy 116 N., Sebastopol, CA 95472
>707-823-9125 X14 voice
>707-823-1734 fax
>david at harmonyfarm.com
>www.harmonyfarm.com
>
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