Grid-Tied SW output meter [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

Did any one want to comment on whether this might work? It sounds interesting
to me.

Todd


William Korthof wrote:

> 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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