KWH meter discrepancy [RE-wrenches]

[Mark Byington]

We have also observed cyclometer KWH meters reading typically 2 to 10% below the cumulative inverter readings.

Here's some anecdotal evidence that I saw with my own eyes - not indicative of every case of course, but probably somewhat typical of mechanical type meters.

About 2 years ago I was looking at the PV system on my own house, which has 2 SMA 2500's with display and a GE I70S mechanical meter with cyclometer readout.  It was early evening and the inverters were putting out about 120 watts total, but the KWH meter was dead stopped.  I rapped on the glass bell housing of the meter with my knuckles, and the meter started moving slowly.

I tend to trust the solid state inverter readout more than the mechanical KWH meter.

Mark
Cobalt Power Systems, Inc.



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