Solar PV (Photovoltaic) Feed-In Tariff Calculator

About these figures

  • Our calculations are unbiased representations of potential payback from Solar PV. To firm up these figures you should arrange a quote from an MCS certified company, this is a requirement of the Feed-in Tariff.
  • For free, we can contact up to 3 certified companies on your behalf to arrange a quote.

More information about the Feed-In Tariff

Please tell us about your roof:

x of space available for panels.
Our Assumptions:
  • My daytime electricity rate: £ per kWh (inc VAT)
  • Use Standard Export Tariff (4.64p/kWh in July 2013) ... OR ...
    My energy supplier has agreed to buy back at £ per kWh
  • % of the energy generated will be used in my home
  • I will have an export meter
  • I want to assess the benefits over a year period
  • Assume RPI of % and annual energy price inflation of %
  • The roof angle is ° (or panel mounting angle if standalone)
  • Assume panel degradation to % of year 1 output after 30 years
  • Assume inverter lifetime of years
  • Assume cable/inverter system losses of % of output
» Change our assumptions

Based on the details above we estimate your annual income and overall investment payback to be as follows:

Investment in 4.00kWp System: * £ 6,712.54
First Year: Income from Feed-In Generation Tariff @ 14.38p/kWh: £ 480.83
  Income from exporting energy @ 4.77p/kWh: £ 79.75
  Electricity Saving: £ 240.75
  Total Benefit: £ 801.33
Payback Time: 7y 5m
Total Profit Over 20 years: £ 16,640.25
12.39 % per year (6.23% AER)
* Current prices for this system may vary from £ 5,715.00 to £ 9,020.00 for this type of installation so it is important to Compare Quotes from MCS certified installers
Calculations include solar radiation and system losses in a central UK location due to Temperature 6.6% and Angular Reflectance 3.1%, as well as other losses (e.g. Cables, Inverter) of 15%. You can change the Inverter/Cable loss and other assumptions if you wish.

These are the details we used to calculate your payback and some alternative scenarios:

Greatest 20yr Payback:

System Power Est Outlay Feed-In & Savings Pay back time Profit over 20yrs  
16 x Canadian Solar 250W Mono 4.00kWp £ 6,712.54 £ 801.33pa 7y 5m £ 16,640.25 detailed calc »
16 x Hyundai HIS 250MG 4.00kWp £ 7,351.02 £ 801.33pa 8y £ 16,001.77 detailed calc »
18 x Sanyo HIT H250E01 4.50kWp £ 8,898.99 £ 850.72pa 8y 10m £ 15,959.73 detailed calc »

Earliest Investment Payback:

System Power Est Outlay Feed-In & Savings Pay back time Profit over 20yrs  
16 x Canadian Solar 250W Mono 4.00kWp £ 6,712.54 £ 801.33pa 7y 5m £ 16,640.25 detailed calc »
16 x Hyundai HIS 250MG 4.00kWp £ 7,351.02 £ 801.33pa 8y £ 16,001.77 detailed calc »
14 x Sharp 250W Poly 3.50kWp £ 6,558.99 £ 701.17pa 8y 3m £ 13,874.70 detailed calc »

Greatest Annual Income:

System Power Est Outlay Feed-In & Savings Pay back time Profit over 20yrs  
20 x Sanyo HIT N240SE10 4.80kWp £ 10,066.12 £ 907.43pa 9y 5m £ 16,449.85 detailed calc »
20 x Sanyo HIT N235SE10 4.70kWp £ 10,036.47 £ 888.53pa 9y 6m £ 15,927.08 detailed calc »
18 x Sanyo HIT H250E01 4.50kWp £ 8,898.99 £ 850.72pa 8y 10m £ 15,959.73 detailed calc »
These estimates are calculated by comparing over 50 MCS certified panels to determine the best possible payback. Assuming that you pay 14.4p per unit and that around 50% of the solar electricity that you generate will be used in your home.

Assumptions:

  • Illustrative solar PV performance figures only. Figures are given in good faith but do not constitute "Financial Advice".
  • Exact PV subsidy figures may depend on grants available at particular locations and other factors.
  • Your property has an Energy Performance Certificate (EPC) rating of level D or better.
  • Yearly PV output uses a factored degradation over time based on industry estimates.
  • Tariffs shown presume installation after at the new FiT rates
  • VAT is included (at 5% where appropriate) unless a new build is specified.
  • Photovoltaic Panels will not be shaded (e.g. by Trees or Buildings) as shading affects PV output.
  • Exact equipment costs are estimated based on retail prices in 2012 and will vary by installer/supplier.
  • Installation costs are based on industry averages for installation type/size. Every install is different and you should obtain 3 quotes.
  • Assuming that you pay 14.4p per unit and that around 50% of the solar electricity that you generate will be used in your home, without an export meter (you can change such assumptions above).
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