The amount of money saved again depends on factors such as efficiency, orientation and the size of the PV system.
For example, if your farm’s electricity needs at a certain time were 30kW and your solar panels were producing 7.5kW, your net import from the grid would be 22.5kW (30kW minus 7.5kW).
Essentially, each unit of electricity not imported from the grid equals savings on energy bills. In the above example, if you were buying energy at 20c per kWh, and you generate 7,500kWh through solar panels, you’d save €1,500.
If your solar panels generate more electricity than you use, then it can be stored in battery for later use (which also protects farms against blackouts), or sold back to the grid for some additional savings.