Example of a 4 year payback on a 49.72 kWp system based in the UK.
- Based on South facing @ 15 degrees
- Solar radiation of 1017 kWh with 44,497 kW per annum generation.
- 3.5% Retail Price Index per annum
- 100% energy usage based on a tariff of 13p per kWh, with a 8% fuel rise per year.
- Installed cost of £110,000