KWH meter discrepancy [RE-wrenches]

[Jeff Clearwater]

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Hi Bob and all,

Yes that has been my theory as well - mostly because I trust digital 
internal inverter metering - and because the effect does seem to be 
pronounced on systems that spend alot of time in the lower wattage 
realm (like a Whisper wind Link that's always just over startup 
speeds).

But I must say my trust of the inverter companies internal metering 
here is in question - does seem funny that utility grade meters would 
be that far off.

Either way we really need to solve it as more and more state rebate 
programs (MA, WA) now require a "utility grade" meter and are based 
on performance - and the customers love EZ read meters over something 
complicated or digital or menu driven.

How about a call to Austin and research it with them - maybe they 
have an idea or a higher grade meter or ???

Any other simple approved meters out there?

Thanks!

Jeff





>Jeff and all,
>
>We've seen exactly the same results with most meters we've tested.  It's
>just a thought in the back of my mind and have not proven this, but I
>suspect residential utility grade meters in general may have a "sweet
>spot" in accuracy based on the average residential loads.  Perhaps they
>just aren't accurate at the low power levels we see from pv early
>morning, late afternoon, and cloudy weather?
>
>Best Regards,
>Bob Maynard
>Energy Outfitters
>
>
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-- 
~~~~~~~~~~~~~
Jeff Clearwater
Village Power Design
Sustainable Energy & Water Solutions for Home & Village
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