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Solar PV (Photovoltaic) Feed-In Tariff Calculator

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.

Solar PV (Photovoltaic) Feed-In Tariff Calculator

  • Calc by Roof
  • Calc by System Size (kWp)
  • Calc by System Price

Calc by Roof

Please tell us about your roof

Calc by System Size (kWp)

Please specify the size of system:

Calc by System Price

Please tell us about your priced system:

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

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.

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

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

Total Profit Over 20 Years

£6,588.06

5.23% per year

(3.58% AER)

Investment in 4.00kWp System: *
£6,299.79
First Year
Income from Feed-In Generation Tariff @ 4.18p/kWh:
£139.77
 
Income from exporting energy from exporting energy @ 4.91p/kWh:
£82.09
 
Electricity Saving:
£208.48
 
Total Benefit:
£430.34
Payback Time:
 
11y 7m
Total Profit Over 20 years:
£6,588.06

Total Profit Over 20 Years

£6,588.06

5.23% per year

(3.58% AER)

* Current prices for this system may vary from £5,208.14 to £7,391.44 for this type of installation so it is important to Compare Quotes from MCS certified installers.
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kWh Generation per month

£ Payback over 20 years

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 in the calculator box above if you wish.

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

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Greatest 20yr Payback:

System
Power
Est Outlay
Feed-In & Savings
Pay back time
Profit over 20yrs
More
System 16 x Canadian Solar 250W Mono
Power 4.00kWp
Est Outlay £6,299.79
Feed-In & Savings £430.34pa
Pay back time 11y 7m
Profit over 20yrs £6,588.06

Annual breakdown for a 4.00kWp system of 16 x 250Wp panels
Facing S @ 35° in a central UK location permits generation of 3,344kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 3,344kWh x 4.18p = £139.77
Export Income 1,672kWh x 4.91p = £82.09
In-house savings 1,672kWh x 12.47p = £208.48
Balance £-5,869.45
Year 2
FiT Generation 3,344kWh x 4.33p = £144.77
Export Income 1,672kWh x 5.09p = £85.03
In-house savings 1,672kWh x 13.09p = £218.90
Balance £-5,420.76
Year 3
FiT Generation 3,343kWh x 4.48p = £149.92
Export Income 1,671kWh x 5.27p = £88.05
In-house savings 1,671kWh x 13.75p = £229.78
Balance £-4,953.00
Year 4
FiT Generation 3,341kWh x 4.65p = £155.22
Export Income 1,671kWh x 5.46p = £91.16
In-house savings 1,671kWh x 14.44p = £241.15
Balance £-4,465.46
Year 5
FiT Generation 3,338kWh x 4.81p = £160.65
Export Income 1,669kWh x 5.65p = £94.36
In-house savings 1,669kWh x 15.16p = £253.01
Balance £-3,957.44
Year 6
FiT Generation 3,335kWh x 4.98p = £166.22
Export Income 1,667kWh x 5.86p = £97.63
In-house savings 1,667kWh x 15.92p = £265.36
Balance £-3,428.23
Year 7
FiT Generation 3,330kWh x 5.16p = £171.92
Export Income 1,665kWh x 6.07p = £100.98
In-house savings 1,665kWh x 16.71p = £278.21
Balance £-2,877.11
Year 8
FiT Generation 3,323kWh x 5.35p = £177.75
Export Income 1,662kWh x 6.28p = £104.40
In-house savings 1,662kWh x 17.55p = £291.57
Balance £-2,303.39
Year 9
FiT Generation 3,316kWh x 5.54p = £183.70
Export Income 1,658kWh x 6.51p = £107.89
In-house savings 1,658kWh x 18.42p = £305.44
Balance £-1,706.37
Year 10
FiT Generation 3,307kWh x 5.74p = £189.75
Export Income 1,653kWh x 6.74p = £111.45
In-house savings 1,653kWh x 19.35p = £319.83
Balance £-1,085.34
Year 11
FiT Generation 3,296kWh x 5.94p = £195.92
Export Income 1,648kWh x 6.98p = £115.07
In-house savings 1,648kWh x 20.31p = £334.73
Balance £-439.62
Year 12
FiT Generation 3,284kWh x 6.16p = £202.18
Export Income 1,642kWh x 7.23p = £118.75
In-house savings 1,642kWh x 21.33p = £350.16
Balance £231.47
Year 13
FiT Generation 3,270kWh x 6.38p = £208.54
Export Income 1,635kWh x 7.49p = £122.48
In-house savings 1,635kWh x 22.39p = £366.10
Balance £928.59
Year 14
FiT Generation 3,254kWh x 6.61p = £214.97
Export Income 1,627kWh x 7.76p = £126.26
In-house savings 1,627kWh x 23.51p = £382.56
Balance £1,652.38
Year 15
FiT Generation 3,236kWh x 6.84p = £221.48
Export Income 1,618kWh x 8.04p = £130.08
In-house savings 1,618kWh x 24.69p = £399.53
Balance £2,403.47
Year 16
FiT Generation 3,217kWh x 7.09p = £228.05
Export Income 1,609kWh x 8.33p = £133.94
In-house savings 1,609kWh x 25.92p = £417.00
Balance £3,182.45
Year 17
FiT Generation 3,196kWh x 7.34p = £234.66
Export Income 1,598kWh x 8.63p = £137.82
In-house savings 1,598kWh x 27.22p = £434.96
Balance £3,989.90
Year 18
FiT Generation 3,173kWh x 7.61p = £241.31
Export Income 1,586kWh x 8.93p = £141.73
In-house savings 1,586kWh x 28.58p = £453.40
Balance £4,826.33
Year 19
FiT Generation 3,148kWh x 7.88p = £247.98
Export Income 1,574kWh x 9.25p = £145.64
In-house savings 1,574kWh x 30.01p = £472.29
Balance £5,692.24
Year 20
FiT Generation 3,120kWh x 8.16p = £254.65
Export Income 1,560kWh x 9.59p = £149.56
In-house savings 1,560kWh x 31.51p = £491.62
Balance £6,588.06
System 14 x Sharp 245W Poly
Power 3.43kWp
Est Outlay £5,576.98
Feed-In & Savings £369.02pa
Pay back time 11y 11m
Profit over 20yrs £5,474.35

Annual breakdown for a 3.43kWp system of 14 x 245Wp panels
Facing S @ 35° in a central UK location permits generation of 2,867kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 2,867kWh x 4.18p = £119.85
Export Income 1,434kWh x 4.91p = £70.39
In-house savings 1,434kWh x 12.47p = £178.77
Balance £-5,207.96
Year 2
FiT Generation 2,867kWh x 4.33p = £124.14
Export Income 1,434kWh x 5.09p = £72.91
In-house savings 1,434kWh x 13.09p = £187.70
Balance £-4,823.21
Year 3
FiT Generation 2,866kWh x 4.48p = £128.56
Export Income 1,433kWh x 5.27p = £75.51
In-house savings 1,433kWh x 13.75p = £197.04
Balance £-4,422.11
Year 4
FiT Generation 2,865kWh x 4.65p = £133.10
Export Income 1,432kWh x 5.46p = £78.17
In-house savings 1,432kWh x 14.44p = £206.79
Balance £-4,004.05
Year 5
FiT Generation 2,863kWh x 4.81p = £137.76
Export Income 1,431kWh x 5.65p = £80.91
In-house savings 1,431kWh x 15.16p = £216.96
Balance £-3,568.42
Year 6
FiT Generation 2,859kWh x 4.98p = £142.54
Export Income 1,430kWh x 5.86p = £83.72
In-house savings 1,430kWh x 15.92p = £227.55
Balance £-3,114.62
Year 7
FiT Generation 2,855kWh x 5.16p = £147.43
Export Income 1,428kWh x 6.07p = £86.59
In-house savings 1,428kWh x 16.71p = £238.57
Balance £-2,642.04
Year 8
FiT Generation 2,850kWh x 5.35p = £152.42
Export Income 1,425kWh x 6.28p = £89.52
In-house savings 1,425kWh x 17.55p = £250.02
Balance £-2,150.07
Year 9
FiT Generation 2,843kWh x 5.54p = £157.52
Export Income 1,422kWh x 6.51p = £92.51
In-house savings 1,422kWh x 18.42p = £261.92
Balance £-1,638.12
Year 10
FiT Generation 2,835kWh x 5.74p = £162.71
Export Income 1,418kWh x 6.74p = £95.56
In-house savings 1,418kWh x 19.35p = £274.25
Balance £-1,105.59
Year 11
FiT Generation 2,826kWh x 5.94p = £168.00
Export Income 1,413kWh x 6.98p = £98.67
In-house savings 1,413kWh x 20.31p = £287.04
Balance £-551.88
Year 12
FiT Generation 2,816kWh x 6.16p = £173.37
Export Income 1,408kWh x 7.23p = £101.82
In-house savings 1,408kWh x 21.33p = £300.26
Balance £23.57
Year 13
FiT Generation 2,804kWh x 6.38p = £178.82
Export Income 1,402kWh x 7.49p = £105.02
In-house savings 1,402kWh x 22.39p = £313.93
Balance £621.35
Year 14
FiT Generation 2,790kWh x 6.61p = £184.34
Export Income 1,395kWh x 7.76p = £108.27
In-house savings 1,395kWh x 23.51p = £328.05
Balance £1,242.00
Year 15
FiT Generation 2,775kWh x 6.84p = £189.92
Export Income 1,388kWh x 8.04p = £111.54
In-house savings 1,388kWh x 24.69p = £342.60
Balance £1,886.06
Year 16
FiT Generation 2,759kWh x 7.09p = £195.55
Export Income 1,379kWh x 8.33p = £114.85
In-house savings 1,379kWh x 25.92p = £357.58
Balance £2,554.04
Year 17
FiT Generation 2,740kWh x 7.34p = £201.22
Export Income 1,370kWh x 8.63p = £118.18
In-house savings 1,370kWh x 27.22p = £372.98
Balance £3,246.42
Year 18
FiT Generation 2,721kWh x 7.61p = £206.92
Export Income 1,360kWh x 8.93p = £121.53
In-house savings 1,360kWh x 28.58p = £388.79
Balance £3,963.66
Year 19
FiT Generation 2,699kWh x 7.88p = £212.64
Export Income 1,349kWh x 9.25p = £124.89
In-house savings 1,349kWh x 30.01p = £404.99
Balance £4,706.18
Year 20
FiT Generation 2,676kWh x 8.16p = £218.36
Export Income 1,338kWh x 9.59p = £128.25
In-house savings 1,338kWh x 31.51p = £421.57
Balance £5,474.35
System 14 x Sharp 250W Poly
Power 3.50kWp
Est Outlay £5,730.48
Feed-In & Savings £376.55pa
Pay back time 12y 1m
Profit over 20yrs £5,546.39

Annual breakdown for a 3.50kWp system of 14 x 250Wp panels
Facing S @ 35° in a central UK location permits generation of 2,926kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 2,926kWh x 4.18p = £122.30
Export Income 1,463kWh x 4.91p = £71.83
In-house savings 1,463kWh x 12.47p = £182.42
Balance £-5,353.93
Year 2
FiT Generation 2,926kWh x 4.33p = £126.67
Export Income 1,463kWh x 5.09p = £74.40
In-house savings 1,463kWh x 13.09p = £191.53
Balance £-4,961.32
Year 3
FiT Generation 2,925kWh x 4.48p = £131.18
Export Income 1,462kWh x 5.27p = £77.05
In-house savings 1,462kWh x 13.75p = £201.06
Balance £-4,552.04
Year 4
FiT Generation 2,923kWh x 4.65p = £135.82
Export Income 1,462kWh x 5.46p = £79.77
In-house savings 1,462kWh x 14.44p = £211.01
Balance £-4,125.44
Year 5
FiT Generation 2,921kWh x 4.81p = £140.57
Export Income 1,461kWh x 5.65p = £82.56
In-house savings 1,461kWh x 15.16p = £221.38
Balance £-3,680.92
Year 6
FiT Generation 2,918kWh x 4.98p = £145.45
Export Income 1,459kWh x 5.86p = £85.42
In-house savings 1,459kWh x 15.92p = £232.19
Balance £-3,217.86
Year 7
FiT Generation 2,913kWh x 5.16p = £150.43
Export Income 1,457kWh x 6.07p = £88.35
In-house savings 1,457kWh x 16.71p = £243.44
Balance £-2,735.64
Year 8
FiT Generation 2,908kWh x 5.35p = £155.53
Export Income 1,454kWh x 6.28p = £91.35
In-house savings 1,454kWh x 17.55p = £255.13
Balance £-2,233.63
Year 9
FiT Generation 2,901kWh x 5.54p = £160.73
Export Income 1,451kWh x 6.51p = £94.40
In-house savings 1,451kWh x 18.42p = £267.26
Balance £-1,711.23
Year 10
FiT Generation 2,893kWh x 5.74p = £166.03
Export Income 1,447kWh x 6.74p = £97.52
In-house savings 1,447kWh x 19.35p = £279.85
Balance £-1,167.83
Year 11
FiT Generation 2,884kWh x 5.94p = £171.43
Export Income 1,442kWh x 6.98p = £100.68
In-house savings 1,442kWh x 20.31p = £292.89
Balance £-602.83
Year 12
FiT Generation 2,873kWh x 6.16p = £176.91
Export Income 1,437kWh x 7.23p = £103.90
In-house savings 1,437kWh x 21.33p = £306.39
Balance £-15.63
Year 13
FiT Generation 2,861kWh x 6.38p = £182.47
Export Income 1,430kWh x 7.49p = £107.17
In-house savings 1,430kWh x 22.39p = £320.34
Balance £594.35
Year 14
FiT Generation 2,847kWh x 6.61p = £188.10
Export Income 1,424kWh x 7.76p = £110.48
In-house savings 1,424kWh x 23.51p = £334.74
Balance £1,227.67
Year 15
FiT Generation 2,832kWh x 6.84p = £193.80
Export Income 1,416kWh x 8.04p = £113.82
In-house savings 1,416kWh x 24.69p = £349.59
Balance £1,884.87
Year 16
FiT Generation 2,815kWh x 7.09p = £199.54
Export Income 1,407kWh x 8.33p = £117.19
In-house savings 1,407kWh x 25.92p = £364.87
Balance £2,566.48
Year 17
FiT Generation 2,796kWh x 7.34p = £205.33
Export Income 1,398kWh x 8.63p = £120.59
In-house savings 1,398kWh x 27.22p = £380.59
Balance £3,272.99
Year 18
FiT Generation 2,776kWh x 7.61p = £211.15
Export Income 1,388kWh x 8.93p = £124.01
In-house savings 1,388kWh x 28.58p = £396.72
Balance £4,004.87
Year 19
FiT Generation 2,754kWh x 7.88p = £216.98
Export Income 1,377kWh x 9.25p = £127.44
In-house savings 1,377kWh x 30.01p = £413.26
Balance £4,762.55
Year 20
FiT Generation 2,730kWh x 8.16p = £222.81
Export Income 1,365kWh x 9.59p = £130.86
In-house savings 1,365kWh x 31.51p = £430.17
Balance £5,546.39

Earliest Investment Payback:

System
Power
Est Outlay
Feed-In & Savings
Pay back time
Profit over 20yrs
More
System 16 x Canadian Solar 250W Mono
Power 4.00kWp
Est Outlay £6,299.79
Feed-In & Savings £430.34pa
Pay back time 11y 7m
Profit over 20yrs £6,588.06

Annual breakdown for a 4.00kWp system of 16 x 250Wp panels
Facing S @ 35° in a central UK location permits generation of 3,344kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 3,344kWh x 4.18p = £139.77
Export Income 1,672kWh x 4.91p = £82.09
In-house savings 1,672kWh x 12.47p = £208.48
Balance £-5,869.45
Year 2
FiT Generation 3,344kWh x 4.33p = £144.77
Export Income 1,672kWh x 5.09p = £85.03
In-house savings 1,672kWh x 13.09p = £218.90
Balance £-5,420.76
Year 3
FiT Generation 3,343kWh x 4.48p = £149.92
Export Income 1,671kWh x 5.27p = £88.05
In-house savings 1,671kWh x 13.75p = £229.78
Balance £-4,953.00
Year 4
FiT Generation 3,341kWh x 4.65p = £155.22
Export Income 1,671kWh x 5.46p = £91.16
In-house savings 1,671kWh x 14.44p = £241.15
Balance £-4,465.46
Year 5
FiT Generation 3,338kWh x 4.81p = £160.65
Export Income 1,669kWh x 5.65p = £94.36
In-house savings 1,669kWh x 15.16p = £253.01
Balance £-3,957.44
Year 6
FiT Generation 3,335kWh x 4.98p = £166.22
Export Income 1,667kWh x 5.86p = £97.63
In-house savings 1,667kWh x 15.92p = £265.36
Balance £-3,428.23
Year 7
FiT Generation 3,330kWh x 5.16p = £171.92
Export Income 1,665kWh x 6.07p = £100.98
In-house savings 1,665kWh x 16.71p = £278.21
Balance £-2,877.11
Year 8
FiT Generation 3,323kWh x 5.35p = £177.75
Export Income 1,662kWh x 6.28p = £104.40
In-house savings 1,662kWh x 17.55p = £291.57
Balance £-2,303.39
Year 9
FiT Generation 3,316kWh x 5.54p = £183.70
Export Income 1,658kWh x 6.51p = £107.89
In-house savings 1,658kWh x 18.42p = £305.44
Balance £-1,706.37
Year 10
FiT Generation 3,307kWh x 5.74p = £189.75
Export Income 1,653kWh x 6.74p = £111.45
In-house savings 1,653kWh x 19.35p = £319.83
Balance £-1,085.34
Year 11
FiT Generation 3,296kWh x 5.94p = £195.92
Export Income 1,648kWh x 6.98p = £115.07
In-house savings 1,648kWh x 20.31p = £334.73
Balance £-439.62
Year 12
FiT Generation 3,284kWh x 6.16p = £202.18
Export Income 1,642kWh x 7.23p = £118.75
In-house savings 1,642kWh x 21.33p = £350.16
Balance £231.47
Year 13
FiT Generation 3,270kWh x 6.38p = £208.54
Export Income 1,635kWh x 7.49p = £122.48
In-house savings 1,635kWh x 22.39p = £366.10
Balance £928.59
Year 14
FiT Generation 3,254kWh x 6.61p = £214.97
Export Income 1,627kWh x 7.76p = £126.26
In-house savings 1,627kWh x 23.51p = £382.56
Balance £1,652.38
Year 15
FiT Generation 3,236kWh x 6.84p = £221.48
Export Income 1,618kWh x 8.04p = £130.08
In-house savings 1,618kWh x 24.69p = £399.53
Balance £2,403.47
Year 16
FiT Generation 3,217kWh x 7.09p = £228.05
Export Income 1,609kWh x 8.33p = £133.94
In-house savings 1,609kWh x 25.92p = £417.00
Balance £3,182.45
Year 17
FiT Generation 3,196kWh x 7.34p = £234.66
Export Income 1,598kWh x 8.63p = £137.82
In-house savings 1,598kWh x 27.22p = £434.96
Balance £3,989.90
Year 18
FiT Generation 3,173kWh x 7.61p = £241.31
Export Income 1,586kWh x 8.93p = £141.73
In-house savings 1,586kWh x 28.58p = £453.40
Balance £4,826.33
Year 19
FiT Generation 3,148kWh x 7.88p = £247.98
Export Income 1,574kWh x 9.25p = £145.64
In-house savings 1,574kWh x 30.01p = £472.29
Balance £5,692.24
Year 20
FiT Generation 3,120kWh x 8.16p = £254.65
Export Income 1,560kWh x 9.59p = £149.56
In-house savings 1,560kWh x 31.51p = £491.62
Balance £6,588.06
System 14 x Sharp 240W Poly
Power 3.36kWp
Est Outlay £5,446.42
Feed-In & Savings £361.49pa
Pay back time 11y 10m
Profit over 20yrs £5,379.38

Annual breakdown for a 3.36kWp system of 14 x 240Wp panels
Facing S @ 35° in a central UK location permits generation of 2,809kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 2,809kWh x 4.18p = £117.41
Export Income 1,404kWh x 4.91p = £68.96
In-house savings 1,404kWh x 12.47p = £175.13
Balance £-5,084.93
Year 2
FiT Generation 2,809kWh x 4.33p = £121.61
Export Income 1,404kWh x 5.09p = £71.42
In-house savings 1,404kWh x 13.09p = £183.87
Balance £-4,708.03
Year 3
FiT Generation 2,808kWh x 4.48p = £125.93
Export Income 1,404kWh x 5.27p = £73.96
In-house savings 1,404kWh x 13.75p = £193.02
Balance £-4,315.11
Year 4
FiT Generation 2,807kWh x 4.65p = £130.38
Export Income 1,403kWh x 5.46p = £76.58
In-house savings 1,403kWh x 14.44p = £202.57
Balance £-3,905.58
Year 5
FiT Generation 2,804kWh x 4.81p = £134.95
Export Income 1,402kWh x 5.65p = £79.26
In-house savings 1,402kWh x 15.16p = £212.53
Balance £-3,478.84
Year 6
FiT Generation 2,801kWh x 4.98p = £139.63
Export Income 1,401kWh x 5.86p = £82.01
In-house savings 1,401kWh x 15.92p = £222.90
Balance £-3,034.30
Year 7
FiT Generation 2,797kWh x 5.16p = £144.42
Export Income 1,398kWh x 6.07p = £84.82
In-house savings 1,398kWh x 16.71p = £233.70
Balance £-2,571.37
Year 8
FiT Generation 2,792kWh x 5.35p = £149.31
Export Income 1,396kWh x 6.28p = £87.69
In-house savings 1,396kWh x 17.55p = £244.92
Balance £-2,089.44
Year 9
FiT Generation 2,785kWh x 5.54p = £154.30
Export Income 1,393kWh x 6.51p = £90.63
In-house savings 1,393kWh x 18.42p = £256.57
Balance £-1,587.94
Year 10
FiT Generation 2,778kWh x 5.74p = £159.39
Export Income 1,389kWh x 6.74p = £93.61
In-house savings 1,389kWh x 19.35p = £268.66
Balance £-1,066.28
Year 11
FiT Generation 2,769kWh x 5.94p = £164.57
Export Income 1,384kWh x 6.98p = £96.66
In-house savings 1,384kWh x 20.31p = £281.18
Balance £-523.87
Year 12
FiT Generation 2,758kWh x 6.16p = £169.83
Export Income 1,379kWh x 7.23p = £99.75
In-house savings 1,379kWh x 21.33p = £294.13
Balance £39.84
Year 13
FiT Generation 2,746kWh x 6.38p = £175.17
Export Income 1,373kWh x 7.49p = £102.88
In-house savings 1,373kWh x 22.39p = £307.53
Balance £625.42
Year 14
FiT Generation 2,733kWh x 6.61p = £180.58
Export Income 1,367kWh x 7.76p = £106.06
In-house savings 1,367kWh x 23.51p = £321.35
Balance £1,233.40
Year 15
FiT Generation 2,719kWh x 6.84p = £186.04
Export Income 1,359kWh x 8.04p = £109.27
In-house savings 1,359kWh x 24.69p = £335.60
Balance £1,864.32
Year 16
FiT Generation 2,702kWh x 7.09p = £191.56
Export Income 1,351kWh x 8.33p = £112.51
In-house savings 1,351kWh x 25.92p = £350.28
Balance £2,518.67
Year 17
FiT Generation 2,684kWh x 7.34p = £197.12
Export Income 1,342kWh x 8.63p = £115.77
In-house savings 1,342kWh x 27.22p = £365.37
Balance £3,196.92
Year 18
FiT Generation 2,665kWh x 7.61p = £202.70
Export Income 1,333kWh x 8.93p = £119.05
In-house savings 1,333kWh x 28.58p = £380.85
Balance £3,899.52
Year 19
FiT Generation 2,644kWh x 7.88p = £208.30
Export Income 1,322kWh x 9.25p = £122.34
In-house savings 1,322kWh x 30.01p = £396.73
Balance £4,626.89
Year 20
FiT Generation 2,621kWh x 8.16p = £213.90
Export Income 1,311kWh x 9.59p = £125.63
In-house savings 1,311kWh x 31.51p = £412.96
Balance £5,379.38
System 14 x Sharp 235W Poly
Power 3.29kWp
Est Outlay £5,337.73
Feed-In & Savings £353.96pa
Pay back time 11y 10m
Profit over 20yrs £5,262.53

Annual breakdown for a 3.29kWp system of 14 x 235Wp panels
Facing S @ 35° in a central UK location permits generation of 2,750kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 2,750kWh x 4.18p = £114.96
Export Income 1,375kWh x 4.91p = £67.52
In-house savings 1,375kWh x 12.47p = £171.48
Balance £-4,983.77
Year 2
FiT Generation 2,750kWh x 4.33p = £119.07
Export Income 1,375kWh x 5.09p = £69.93
In-house savings 1,375kWh x 13.09p = £180.04
Balance £-4,614.72
Year 3
FiT Generation 2,749kWh x 4.48p = £123.31
Export Income 1,375kWh x 5.27p = £72.42
In-house savings 1,375kWh x 13.75p = £189.00
Balance £-4,229.99
Year 4
FiT Generation 2,748kWh x 4.65p = £127.67
Export Income 1,374kWh x 5.46p = £74.98
In-house savings 1,374kWh x 14.44p = £198.35
Balance £-3,828.99
Year 5
FiT Generation 2,746kWh x 4.81p = £132.14
Export Income 1,373kWh x 5.65p = £77.61
In-house savings 1,373kWh x 15.16p = £208.10
Balance £-3,411.14
Year 6
FiT Generation 2,743kWh x 4.98p = £136.72
Export Income 1,371kWh x 5.86p = £80.30
In-house savings 1,371kWh x 15.92p = £218.26
Balance £-2,975.86
Year 7
FiT Generation 2,739kWh x 5.16p = £141.41
Export Income 1,369kWh x 6.07p = £83.05
In-house savings 1,369kWh x 16.71p = £228.83
Balance £-2,522.57
Year 8
FiT Generation 2,734kWh x 5.35p = £146.20
Export Income 1,367kWh x 6.28p = £85.87
In-house savings 1,367kWh x 17.55p = £239.82
Balance £-2,050.69
Year 9
FiT Generation 2,727kWh x 5.54p = £151.09
Export Income 1,364kWh x 6.51p = £88.74
In-house savings 1,364kWh x 18.42p = £251.23
Balance £-1,559.63
Year 10
FiT Generation 2,720kWh x 5.74p = £156.07
Export Income 1,360kWh x 6.74p = £91.66
In-house savings 1,360kWh x 19.35p = £263.06
Balance £-1,048.84
Year 11
FiT Generation 2,711kWh x 5.94p = £161.14
Export Income 1,355kWh x 6.98p = £94.64
In-house savings 1,355kWh x 20.31p = £275.32
Balance £-517.73
Year 12
FiT Generation 2,701kWh x 6.16p = £166.29
Export Income 1,350kWh x 7.23p = £97.67
In-house savings 1,350kWh x 21.33p = £288.01
Balance £34.24
Year 13
FiT Generation 2,689kWh x 6.38p = £171.52
Export Income 1,345kWh x 7.49p = £100.74
In-house savings 1,345kWh x 22.39p = £301.12
Balance £607.61
Year 14
FiT Generation 2,676kWh x 6.61p = £176.82
Export Income 1,338kWh x 7.76p = £103.85
In-house savings 1,338kWh x 23.51p = £314.66
Balance £1,202.93
Year 15
FiT Generation 2,662kWh x 6.84p = £182.17
Export Income 1,331kWh x 8.04p = £106.99
In-house savings 1,331kWh x 24.69p = £328.61
Balance £1,820.70
Year 16
FiT Generation 2,646kWh x 7.09p = £187.57
Export Income 1,323kWh x 8.33p = £110.16
In-house savings 1,323kWh x 25.92p = £342.98
Balance £2,461.42
Year 17
FiT Generation 2,629kWh x 7.34p = £193.01
Export Income 1,314kWh x 8.63p = £113.36
In-house savings 1,314kWh x 27.22p = £357.75
Balance £3,125.54
Year 18
FiT Generation 2,610kWh x 7.61p = £198.48
Export Income 1,305kWh x 8.93p = £116.57
In-house savings 1,305kWh x 28.58p = £372.92
Balance £3,813.51
Year 19
FiT Generation 2,589kWh x 7.88p = £203.96
Export Income 1,294kWh x 9.25p = £119.79
In-house savings 1,294kWh x 30.01p = £388.46
Balance £4,525.72
Year 20
FiT Generation 2,566kWh x 8.16p = £209.45
Export Income 1,283kWh x 9.59p = £123.01
In-house savings 1,283kWh x 31.51p = £404.36
Balance £5,262.53

Greatest Annual Income:

System
Power
Est Outlay
Feed-In & Savings
Pay back time
Profit over 20yrs
More
System 20 x Sanyo HIT N240SE10
Power 4.80kWp
Est Outlay £10,344.77
Feed-In & Savings £516.41pa
Pay back time 14y 10m
Profit over 20yrs £5,120.66

Annual breakdown for a 4.80kWp system of 20 x 240Wp panels
Facing S @ 35° in a central UK location permits generation of 4,013kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 4,013kWh x 4.18p = £167.72
Export Income 2,006kWh x 4.91p = £98.51
In-house savings 2,006kWh x 12.47p = £250.18
Balance £-9,828.36
Year 2
FiT Generation 4,012kWh x 4.33p = £173.72
Export Income 2,006kWh x 5.09p = £102.03
In-house savings 2,006kWh x 13.09p = £262.67
Balance £-9,289.93
Year 3
FiT Generation 4,011kWh x 4.48p = £179.91
Export Income 2,006kWh x 5.27p = £105.66
In-house savings 2,006kWh x 13.75p = £275.74
Balance £-8,728.62
Year 4
FiT Generation 4,009kWh x 4.65p = £186.26
Export Income 2,005kWh x 5.46p = £109.40
In-house savings 2,005kWh x 14.44p = £289.38
Balance £-8,143.57
Year 5
FiT Generation 4,006kWh x 4.81p = £192.79
Export Income 2,003kWh x 5.65p = £113.23
In-house savings 2,003kWh x 15.16p = £303.61
Balance £-7,533.95
Year 6
FiT Generation 4,002kWh x 4.98p = £199.47
Export Income 2,001kWh x 5.86p = £117.15
In-house savings 2,001kWh x 15.92p = £318.43
Balance £-6,898.89
Year 7
FiT Generation 3,996kWh x 5.16p = £206.31
Export Income 1,998kWh x 6.07p = £121.17
In-house savings 1,998kWh x 16.71p = £333.86
Balance £-6,237.55
Year 8
FiT Generation 3,988kWh x 5.35p = £213.30
Export Income 1,994kWh x 6.28p = £125.28
In-house savings 1,994kWh x 17.55p = £349.89
Balance £-5,549.09
Year 9
FiT Generation 3,979kWh x 5.54p = £220.43
Export Income 1,989kWh x 6.51p = £129.47
In-house savings 1,989kWh x 18.42p = £366.53
Balance £-4,832.66
Year 10
FiT Generation 3,968kWh x 5.74p = £227.70
Export Income 1,984kWh x 6.74p = £133.74
In-house savings 1,984kWh x 19.35p = £383.80
Balance £-4,087.42
Year 11
FiT Generation 3,955kWh x 5.94p = £235.10
Export Income 1,978kWh x 6.98p = £138.08
In-house savings 1,978kWh x 20.31p = £401.68
Balance £-3,312.56
Year 12
FiT Generation 3,940kWh x 6.16p = £242.62
Export Income 1,970kWh x 7.23p = £142.49
In-house savings 1,970kWh x 21.33p = £420.19
Balance £-2,507.26
Year 13
FiT Generation 3,924kWh x 6.38p = £250.24
Export Income 1,962kWh x 7.49p = £146.97
In-house savings 1,962kWh x 22.39p = £439.32
Balance £-1,670.72
Year 14
FiT Generation 3,905kWh x 6.61p = £257.97
Export Income 1,952kWh x 7.76p = £151.51
In-house savings 1,952kWh x 23.51p = £459.07
Balance £-802.17
Year 15
FiT Generation 3,884kWh x 6.84p = £265.78
Export Income 1,942kWh x 8.04p = £156.10
In-house savings 1,942kWh x 24.69p = £479.43
Balance £99.14
Year 16
FiT Generation 3,860kWh x 7.09p = £273.66
Export Income 1,930kWh x 8.33p = £160.72
In-house savings 1,930kWh x 25.92p = £500.40
Balance £1,033.92
Year 17
FiT Generation 3,835kWh x 7.34p = £281.59
Export Income 1,917kWh x 8.63p = £165.39
In-house savings 1,917kWh x 27.22p = £521.95
Balance £2,002.85
Year 18
FiT Generation 3,807kWh x 7.61p = £289.57
Export Income 1,904kWh x 8.93p = £170.07
In-house savings 1,904kWh x 28.58p = £544.08
Balance £3,006.57
Year 19
FiT Generation 3,777kWh x 7.88p = £297.57
Export Income 1,889kWh x 9.25p = £174.77
In-house savings 1,889kWh x 30.01p = £566.75
Balance £4,045.67
Year 20
FiT Generation 3,744kWh x 8.16p = £305.57
Export Income 1,872kWh x 9.59p = £179.47
In-house savings 1,872kWh x 31.51p = £589.95
Balance £5,120.66
System 20 x Sanyo HIT N235SE10
Power 4.70kWp
Est Outlay £10,143.00
Feed-In & Savings £505.65pa
Pay back time 14y 10m
Profit over 20yrs £5,000.23

Annual breakdown for a 4.70kWp system of 20 x 235Wp panels
Facing S @ 35° in a central UK location permits generation of 3,929kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 3,929kWh x 4.18p = £164.23
Export Income 1,964kWh x 4.91p = £96.46
In-house savings 1,964kWh x 12.47p = £244.97
Balance £-9,637.35
Year 2
FiT Generation 3,929kWh x 4.33p = £170.11
Export Income 1,964kWh x 5.09p = £99.91
In-house savings 1,964kWh x 13.09p = £257.20
Balance £-9,110.13
Year 3
FiT Generation 3,928kWh x 4.48p = £176.16
Export Income 1,964kWh x 5.27p = £103.46
In-house savings 1,964kWh x 13.75p = £270.00
Balance £-8,560.52
Year 4
FiT Generation 3,926kWh x 4.65p = £182.38
Export Income 1,963kWh x 5.46p = £107.12
In-house savings 1,963kWh x 14.44p = £283.36
Balance £-7,987.66
Year 5
FiT Generation 3,923kWh x 4.81p = £188.77
Export Income 1,961kWh x 5.65p = £110.87
In-house savings 1,961kWh x 15.16p = £297.29
Balance £-7,390.74
Year 6
FiT Generation 3,918kWh x 4.98p = £195.31
Export Income 1,959kWh x 5.86p = £114.71
In-house savings 1,959kWh x 15.92p = £311.80
Balance £-6,768.91
Year 7
FiT Generation 3,912kWh x 5.16p = £202.01
Export Income 1,956kWh x 6.07p = £118.65
In-house savings 1,956kWh x 16.71p = £326.90
Balance £-6,121.35
Year 8
FiT Generation 3,905kWh x 5.35p = £208.86
Export Income 1,953kWh x 6.28p = £122.67
In-house savings 1,953kWh x 17.55p = £342.60
Balance £-5,447.23
Year 9
FiT Generation 3,896kWh x 5.54p = £215.84
Export Income 1,948kWh x 6.51p = £126.77
In-house savings 1,948kWh x 18.42p = £358.90
Balance £-4,745.73
Year 10
FiT Generation 3,885kWh x 5.74p = £222.96
Export Income 1,943kWh x 6.74p = £130.95
In-house savings 1,943kWh x 19.35p = £375.80
Balance £-4,016.02
Year 11
FiT Generation 3,873kWh x 5.94p = £230.20
Export Income 1,936kWh x 6.98p = £135.20
In-house savings 1,936kWh x 20.31p = £393.31
Balance £-3,257.30
Year 12
FiT Generation 3,858kWh x 6.16p = £237.56
Export Income 1,929kWh x 7.23p = £139.53
In-house savings 1,929kWh x 21.33p = £411.44
Balance £-2,468.77
Year 13
FiT Generation 3,842kWh x 6.38p = £245.03
Export Income 1,921kWh x 7.49p = £143.91
In-house savings 1,921kWh x 22.39p = £430.17
Balance £-1,649.66
Year 14
FiT Generation 3,823kWh x 6.61p = £252.59
Export Income 1,912kWh x 7.76p = £148.35
In-house savings 1,912kWh x 23.51p = £449.51
Balance £-799.20
Year 15
FiT Generation 3,803kWh x 6.84p = £260.24
Export Income 1,901kWh x 8.04p = £152.84
In-house savings 1,901kWh x 24.69p = £469.45
Balance £83.33
Year 16
FiT Generation 3,780kWh x 7.09p = £267.96
Export Income 1,890kWh x 8.33p = £157.38
In-house savings 1,890kWh x 25.92p = £489.97
Balance £998.63
Year 17
FiT Generation 3,755kWh x 7.34p = £275.73
Export Income 1,878kWh x 8.63p = £161.94
In-house savings 1,878kWh x 27.22p = £511.08
Balance £1,947.38
Year 18
FiT Generation 3,728kWh x 7.61p = £283.54
Export Income 1,864kWh x 8.93p = £166.53
In-house savings 1,864kWh x 28.58p = £532.74
Balance £2,930.19
Year 19
FiT Generation 3,698kWh x 7.88p = £291.37
Export Income 1,849kWh x 9.25p = £171.13
In-house savings 1,849kWh x 30.01p = £554.94
Balance £3,947.63
Year 20
FiT Generation 3,666kWh x 8.16p = £299.21
Export Income 1,833kWh x 9.59p = £175.73
In-house savings 1,833kWh x 31.51p = £577.66
Balance £5,000.23
System 18 x Sanyo HIT H250E01
Power 4.50kWp
Est Outlay £8,776.70
Feed-In & Savings £484.14pa
Pay back time 13y 9m
Profit over 20yrs £5,722.13

Annual breakdown for a 4.50kWp system of 18 x 250Wp panels
Facing S @ 35° in a central UK location permits generation of 3,762kWh/pa

Year
FiT Generation
Export Income
In-house savings
Balance
Year 1
FiT Generation 3,762kWh x 4.18p = £157.24
Export Income 1,881kWh x 4.91p = £92.35
In-house savings 1,881kWh x 12.47p = £234.54
Balance £-8,292.57
Year 2
FiT Generation 3,762kWh x 4.33p = £162.87
Export Income 1,881kWh x 5.09p = £95.65
In-house savings 1,881kWh x 13.09p = £246.26
Balance £-7,787.79
Year 3
FiT Generation 3,761kWh x 4.48p = £168.66
Export Income 1,880kWh x 5.27p = £99.06
In-house savings 1,880kWh x 13.75p = £258.51
Balance £-7,261.56
Year 4
FiT Generation 3,759kWh x 4.65p = £174.62
Export Income 1,879kWh x 5.46p = £102.56
In-house savings 1,879kWh x 14.44p = £271.30
Balance £-6,713.08
Year 5
FiT Generation 3,756kWh x 4.81p = £180.74
Export Income 1,878kWh x 5.65p = £106.15
In-house savings 1,878kWh x 15.16p = £284.64
Balance £-6,141.56
Year 6
FiT Generation 3,752kWh x 4.98p = £187.00
Export Income 1,876kWh x 5.86p = £109.83
In-house savings 1,876kWh x 15.92p = £298.53
Balance £-5,546.19
Year 7
FiT Generation 3,746kWh x 5.16p = £193.42
Export Income 1,873kWh x 6.07p = £113.60
In-house savings 1,873kWh x 16.71p = £312.99
Balance £-4,926.19
Year 8
FiT Generation 3,739kWh x 5.35p = £199.97
Export Income 1,869kWh x 6.28p = £117.45
In-house savings 1,869kWh x 17.55p = £328.02
Balance £-4,280.76
Year 9
FiT Generation 3,730kWh x 5.54p = £206.66
Export Income 1,865kWh x 6.51p = £121.37
In-house savings 1,865kWh x 18.42p = £343.62
Balance £-3,609.10
Year 10
FiT Generation 3,720kWh x 5.74p = £213.47
Export Income 1,860kWh x 6.74p = £125.38
In-house savings 1,860kWh x 19.35p = £359.81
Balance £-2,910.44
Year 11
FiT Generation 3,708kWh x 5.94p = £220.41
Export Income 1,854kWh x 6.98p = £129.45
In-house savings 1,854kWh x 20.31p = £376.58
Balance £-2,184.01
Year 12
FiT Generation 3,694kWh x 6.16p = £227.45
Export Income 1,847kWh x 7.23p = £133.59
In-house savings 1,847kWh x 21.33p = £393.93
Balance £-1,429.03
Year 13
FiT Generation 3,678kWh x 6.38p = £234.60
Export Income 1,839kWh x 7.49p = £137.79
In-house savings 1,839kWh x 22.39p = £411.86
Balance £-644.78
Year 14
FiT Generation 3,661kWh x 6.61p = £241.84
Export Income 1,830kWh x 7.76p = £142.04
In-house savings 1,830kWh x 23.51p = £430.38
Balance £169.49
Year 15
FiT Generation 3,641kWh x 6.84p = £249.17
Export Income 1,820kWh x 8.04p = £146.34
In-house savings 1,820kWh x 24.69p = £449.47
Balance £1,014.46
Year 16
FiT Generation 3,619kWh x 7.09p = £256.55
Export Income 1,810kWh x 8.33p = £150.68
In-house savings 1,810kWh x 25.92p = £469.12
Balance £1,890.82
Year 17
FiT Generation 3,595kWh x 7.34p = £263.99
Export Income 1,798kWh x 8.63p = £155.05
In-house savings 1,798kWh x 27.22p = £489.33
Balance £2,799.19
Year 18
FiT Generation 3,569kWh x 7.61p = £271.47
Export Income 1,785kWh x 8.93p = £159.44
In-house savings 1,785kWh x 28.58p = £510.07
Balance £3,740.18
Year 19
FiT Generation 3,541kWh x 7.88p = £278.97
Export Income 1,770kWh x 9.25p = £163.85
In-house savings 1,770kWh x 30.01p = £531.33
Balance £4,714.33
Year 20
FiT Generation 3,510kWh x 8.16p = £286.48
Export Income 1,755kWh x 9.59p = £168.25
In-house savings 1,755kWh x 31.51p = £553.07
Balance £5,722.13
These estimates are calculated by comparing over 50 MCS certified panels to determine the best possible payback. Assuming that you pay 0.1247p per unit and that around 50% of the solar electricity that you generate will be used in your home.

Our Assumptions

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  • Illustrative solar PV performance figures only. Figures are given in good faith but do not constitute "Financial Advice".
  • Your property has an Energy Performance Certificate (EPC) rating of level D or better.
  • Photovoltaic Panels will not be shaded (e.g. by Trees or Buildings) as shading affects PV output.
  • Installation costs are based on industry averages for installation type/size. Every install is different and you should obtain 3 quotes.
  • Exact PV subsidy figures may depend on grants available at particular locations and other factors.
  • Yearly PV output uses a factored degradation over time based on industry estimates.
  • VAT is included (at 5% where appropriate) unless a new build is specified.
  • Exact equipment costs are estimated based on retail prices in 2012 and will vary by installer/supplier.
  • Assuming that you pay 0.1247p per unit and that around 50% of the solar electricity that you generate will be used in your home, without an export meter.
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