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Solar PV Feed-in Tariff Calculator

To use our Solar PV Feed-in Tariff Calculator, simply change the values in the left column and click the Calculate button. Some common values have already been selected for you.

Calculator Inputs

System Type
The vast majority of Solar PV systems are tied into a property i.e. Building-Tied. Higher Feed-in Tariff rates are paid for Building-Tied systems.

System Size
The bigger the system, the more money you can make from the Feed-in Tariff. However, the size will obviously depend on your budget and the available roof space. Our calculator works with all values from 1kWp to 250kWp, but bear in mind that Home Solar Panels tend to be between 2kWp and 4kWp in size.

Based on the system size entered, the Feed-in Tariff calculator will estimate the space required to locate the Solar Panels.

Estimated Export
The Export Tariff is paid by the Utility company of your choice. It does not have to be whoever supplies your electricity. Some Utility companies assume a 50% export and do not measure the actual amount fed back into the grid.

If you think you will export all of the electricity (i.e. not use any) and providing the Utility company fits an export meter, choose 100% Exported. Similarly, if you think you will use all of the electricity choose 0% Exported. The latter is the best option because by using the electricity you save around 14p per kWh by not purchasing it from your supplier. Exporting electricity only pays 4.5p per kWh.

Choose the region you live in based upon the map. The further North you live, the lower the levels of Solar Irradiation. There are less hours of sunlight and generally poorer conditions the further North you are. However, location is not a major factor because Feed-in Tariffs still produce a good Return on Investment no matter where you live.

If you are in an area that appears to border two regions, select one region at a time and see how much difference it makes. This does not make any difference to applying for quotes through our website and our installers will be able to estimate the amount of electricity produced more accurately.

Calculator Outputs

Estimated System Cost
This is an estimated maximum figure based upon the national average installation cost. In many cases, the cost will be lower and so the payback time and the Return on Investment will be better. A surveyor can give you actual costs and estimate the savings more accurately.

Electricity Generated
A 2.5kWp system might produce 2171kWh of electricity per year. Another factor affecting the amount of electricity generated is the region you live in (as explained above). The direction and tilt of the panels can also affect output, as explained in the assumptions section below.

Generation Tariff Income
This amount is paid for every unit, or kWh, of electricity produced. For example, a 2.5kWp system producing 2171kWh of electricity each year will earn £335 per year from the Generation Tariff (2171 x 15.44p per kWh).

Export Tariff Income
As explained above, some Utility companies do not fit an export meter and assume 50% of the electricity is exported. If you use all the electricity and there is an export meter, this figure will be zero. If you export all the electricity, you will be paid 4.5p per kWh so a 2.5kWp system producing 2171kWh each year will yield £65 (2171 x £0.03). If 50% of the electricity is exported and 50% is used, you will receive a £25 Export Tariff payment. As above, the more electricity you use from Solar PV the better because you are not having to buy it from the grid at around 14p per kWh.

Electricity Bill Savings
This value depends on how much electricity you use and how much is exported. If you don’t use any of the electricity, this figure will be zero. If you use it all, you will save 14p per kWh as you’re not having to buy electricity from the grid. In the above 2kWp example, if all 2171kWh was used, you’d save £303 per year on your bills (2171 x £0.14).

Total Income & Savings
The total of the Generation Tariff, Export Tariff and Savings made on electricity bills over a period of one year.

Lifetime Savings
The Total Income & Savings per year multiplied by the Feed-in Tariff period of 20 years. After this time you will continue to save on bills if you use the electricity produced.

Payback Time
This is an approximation of the length of time it will take to recover the initial cost of the system.

Return On Investment
This is the annual Return on Investment, calculated as a percentage of the initial installation cost.

Panel Space Required
An estimate of the amount of space you will need to install the panels for the size of system required. As mentioned above, each kWp requires approximately 8m2 of space.

Calculator Assumptions

Please note that the Calculator is based on a number of assumptions, outlined below:

  • An average electricity price of 13.95 pence per kWh.
  • The panels face in the optimal direction i.e. South facing.
  • The angle or tilt of the panels is optimal for your location.
  • No shading by trees, buildings, etc. as this reduces performance.
  • Does not include maintenance costs, but they are typically low.
  • Does not account for variations in electricity prices.
  • Does not account for inflation but FITs are index linked.
  • Space required for panels assumes 8m2 per kWp.

If you pay less for your electricity, than the 13.95p per kWh that is assumed, you will not save as much money by using the electricity generated. Conversely, if you pay more than this you will save more.

The calculator also assumes that the roof faces due South and the panels are angled at 30 degrees, which is the position that they will generate the most electricity. However, providing there is some tilt and the panels face somewhere between East and West (through South), you will still achieve a good Return on Investment.


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