Why measure power quality after solar system installation?
Active power should be measured to determine power consumption and well as the rate of reverse power flow. This shows whether there is proper, expected energy usage or not.
Reactive power should be measured as well to determine if power is being used even when the plant is not in operation.
The monitoring system will detect when there is poor power factor and ensure that the demand for power is being met and that energy is not being wasted.
The voltage and harmonics will need to be monitored as well to check for any distortions. Minor distortion is expected, but when the variance exceeds 5%, the monitoring system will see that as beyond the acceptable limits.