Investing in a solar PV the system can Typically cost between £1200 to £1800 Per Kwp fitted, so a 4kwp PV the system can cost around £5400 including VAT.
A 4kwp PV array could help you save around £350-450 per year on your electricity bills. You can typically expect payback on the investment within 15 years. You can expect to achieve around 7% return on your investment over a 25 year period.
On average the cost of generating a Kwh from your PV system can be around 10.0p Per kWh & as the PV panels have a minimum of 25 years life span your cost of generating this electricity is virtually fixed for the next 25 years. Now compare that with what has happened to grid electricity prices over the last 10 years & how much costs will continue to rise over the next 25 years? With the current average grid electricity prices of 16.5p+ per kWh it certainly makes investing in solar PV a sure thing.