How to Connect Solar Panels to the National Grid | UKPower
Connecting your solar PV system to the grid allows you to take advantage of the FIT, which gives you a fixed amount of money for each kWh of electricity you generate. then it can be connected to the grid. Larger systems can qualify if the efficiency of the inverter results in a 3.68kW output (e.g. a 4.5kW system running at 81% efficiency).