130109-2013 EST
I now have DTE data from most of the days since my smart meter was installed. There are possibly 2 to 4 missing days in about 100 days. The data they are providing can be useful to an ordinary customer. But study and analysis is required on the customer's part. Will customers use the information? Probably not many.
Since I am now getting the smart meter data I have restarted collecting data with TED. An interesting result from the data for 1-8-2013 is that thru the night TED was reading about 10% high compared to DTE. During the day it is more in the 5% high range.
My night time load is almost all single phase induction motors, furnace, and refrigeration, and adds to an average of about 800 W. This same load exists during the day, but now there is more non-phase shifted load added to that base load. Much of this added load will have some bad power factor, but a lot is distortion power factor, and some unity PF.
I know from tests that I have run using the TED system on an unloaded induction motor that that it reads substantially high on power relative to the actual power consumed.
I believe I have previously shared some of this data. For an unloaded 1/3 HP motor actual power input was 139 W, but TED read 186 W. PF was 0.25. At partial power factor correction, PF = 0.62, the power values were 138 W and 152 W. So under loaded conditions, PF will probably be higher than 0.62 and I can't presently measure it, but I certainly can expect TED to read high.
On a pure resistive load TED is relatively close on power calibration. Probably closer than 5%.
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