Once you have bought your solar PV panels, the maintenance and operating costs are small. The panels and inverters will require cleaning approximately every few years. Panel output should be expected to fall at a rate of 1% per year. owners can see a payback of less than five years on their solar PV investment and enjoy a dependable supply of renewable electricity for over 30 years, making it probably one of the best investments that anyone can make to improve their sustainability credentials.The financial return is mainly tied up with the value and amount of energy generated.
If, as in most cases, your solar PV panels operate in parallel with your mains supply, they help to displace the energy you would normally have bought from the grid. For example, if your electricity need at a particular time is 20kW and your PV system was producing 5kW, your net import from the grid would be 15kW. Each unit of electricity you displace from your imported requirement effectively saves you on the imported price of that unit.0.