Discrepancy between net meter yield and inverter yield

[websterize]

Since the utility installed a net meter Tuesday at 9 a.m., it has recorded 96 kWh from the array back to the grid. The net meter has recorded a use of 30 kWH, for a net of 66 kWh back to the grid. In that same time, the array inverters have recorded 124 kWh generated. A +28 kWh difference in three days seems high. Are the inverters off, is the meter off or is this an acceptable margin of error?

It's a 10.14 kW (DC) system of 39 x 260W panels. The net meter is less than 10 feet from the inverters, which are both outside. There is an AC disconnect between the inverters and the net meter. The inverters are an SMA4000 and an SMA7000, each with an internal consumption at night of 0.1 W, according to the spec sheet. The utility's meter is residential net/bi-directional (https://www.firstenergycorp.com/cont...ing-Primer.pdf.)

[Naptown]

Seems like the system has produced 124 KWH
you fed 96 back to the grid at times when you were over producing
you then took 30 KWH back from the grid
96+30=126 KWH
Now say you are using 5 KWH for an hour in the house
the system is producing 10KWH in that same time
The meter will read that you sent 5 KWH back to the grid
The inverter will say you produced 10KWH.
The inverter meters are actually not that accurate which is why on systems over 10KW AC you need a separate revenue meter for the SREC's

[Sunking]

Rich beat me to it. You are just using the wrong math formula and did not consider how much you used. Think of it this way your panels produced 124 Kwh. The power it generates has to go somewhere of either out on the grid used by your neighbors, or to your home, or both. It is what you used that is throwing you off because you did not account for it.

Your home consumed GTI Power - Power to the grid. So 124 Kwh - 96 Kwh = 28 Kwh.

[websterize]

Ah, now I get it. Many thanks.