Obviously, the price of a solar PV system depends on its size. Rooftop solar can be as little as £680 per kWp. This can rise due to other factors such as roof access costs, the covering and the pitch. A 10kW system for a roof would be around £8,000, it would be more for a flat roof as the mounting system is more advanced.
50kW systems are very popular, one of those will cost around £32,000 depending on the access and roof fittings. You can also have a ground mount solar panel system if the business has the land.
If your business has a large roof and can fit a 100kW system, this will be roughly double the amount of the 50kW system, coming in around £64,000.
A 50kW system will give up to £5500 a year savings and like the cost, the payback for the 100kW system will be around double at £11,000. So as you can see from the figures, the payback of the 50 & 100kW systems is just over five and a half years.