SOLAR PAYBACK CALCULATOR

About Your Installation

Total Price of installation: £
Annual Generation Capacity: kWh. / year
Expected Working Lifetime: years
Expected Lifetime Output: kWh.

How Your Panels Age

After years,
Output degrades to: % of initial value
Output reaches 50% after: years
Equivalent Undegraded Lifetime: years at 100% output

Considering this as a bulk electricity purchase

Equivalent unit price: p / kWh.

This calculator takes account of the gradual reduction in output of your solar panels as they age, to determine the total amount of electricity generated over their working lifetime; and thence the equivalent cost per kWh. of electricity generated by your solar panel system over its working lifetime.

If the price of electricity passes this value during the lifetime of the system, even without the benefit of any feed-in tariff or export payments, you will end up making a net saving.