Solar Inverter output issue?

My solar inverter "sometimes" does not utilize solar panels power completely, when grid is available. For example, I have 3000w panels, and my load is 1000w.... When grid power is available, it takes for example 200w from solar array and rest 800w from grid. If I turn off grid power, it starts giving... show more My solar inverter "sometimes" does not utilize solar panels power completely, when grid is available. For example, I have 3000w panels, and my load is 1000w.... When grid power is available, it takes for example 200w from solar array and rest 800w from grid. If I turn off grid power, it starts giving complete 1000w from panels to the load. NOTE: It happens sometime NOT always, most of the times my inverter is taking maximum available solar power even if grid power is available.

What could posaibly be the reason?
0