Why does the power generation displayed by the inverter appear to be higher than the meter reading?

In most cases, the power generation displayed by the inverter is higher than the meter reading. The main reason is that the reading displayed on the inverter screen or monitoring display is the power generation of the inverter AC output. The power generation is transmitted to the meter through a section of AC cable. There is some power loss on the AC cable. The amount of loss depends on several factors such as the cable material (copper, aluminum), length, wire diameter, etc. Line loss will cause the inverter reading to be greater than the meter reading.

According to normal errors, the inverter current measurement accuracy is -0.5%. Taking into account the errors of the hardware sampling circuit and software technology, the overall error is calculated as +1% (the inverter value is 1% larger than the actual value); the meter error is calculated as -1% (the meter value is 1% smaller than the actual value). At this time, the error should be about 2%. (Not considering line loss, the maximum value of the instrument error)

Assuming that a 10kW power station can generate 60 kWh of electricity a day, a 2% error means a difference of 1.2 kWh per day, or about 30 kWh per month. This is within a reasonable range!