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:

Postcode:

Roof faces:

and has 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
The install type is:
% 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: *		£ 6,303.79
First Year:	Income from Feed-In Generation Tariff @ 12.47p/kWh:	£ 416.97
	Income from exporting energy @ 4.85p/kWh:	£ 81.09
	Electricity Saving:	£ 226.04
	Total Benefit:	£ 724.09
Payback Time:		7y 7m
Total Profit Over 20 years:		£ 14,835.19 11.77 % per year (6.05% AER)
* Current prices for this system may vary from £ -200.00 to £ 14,440.00 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

£ 6,303.79

£ 724.09pa

7y 7m

£ 14,835.19

detailed calc »

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
1	3,344kWh x 12.47p = £ 416.97	1,672kWh x 4.85p = £ 81.09	1,672kWh x 13.52p = £ 226.04	£ -5,579.70
2	3,344kWh x 12.92p = £ 431.89	1,672kWh x 5.02p = £ 83.99	1,672kWh x 14.20p = £ 237.33	£ -4,826.50
3	3,343kWh x 13.38p = £ 447.26	1,671kWh x 5.20p = £ 86.98	1,671kWh x 14.91p = £ 249.13	£ -4,043.13
4	3,341kWh x 13.86p = £ 463.06	1,671kWh x 5.39p = £ 90.05	1,671kWh x 15.65p = £ 261.46	£ -3,228.57
5	3,338kWh x 14.36p = £ 479.27	1,669kWh x 5.58p = £ 93.20	1,669kWh x 16.43p = £ 274.31	£ -2,381.78
6	3,335kWh x 14.87p = £ 495.89	1,667kWh x 5.78p = £ 96.43	1,667kWh x 17.26p = £ 287.71	£ -1,501.75
7	3,330kWh x 15.40p = £ 512.90	1,665kWh x 5.99p = £ 99.74	1,665kWh x 18.12p = £ 301.64	£ -587.47
8	3,323kWh x 15.96p = £ 530.27	1,662kWh x 6.21p = £ 103.12	1,662kWh x 19.02p = £ 316.12	£ 362.05
9	3,316kWh x 16.53p = £ 548.01	1,658kWh x 6.43p = £ 106.57	1,658kWh x 19.98p = £ 331.16	£ 1,347.79
10	3,307kWh x 17.12p = £ 566.08	1,653kWh x 6.66p = £ 110.08	1,653kWh x 20.97p = £ 346.76	£ 2,370.71
11	3,296kWh x 17.73p = £ 584.47	1,648kWh x 6.90p = £ 113.66	1,648kWh x 22.02p = £ 362.92	£ 3,431.77
12	3,284kWh x 18.37p = £ 603.16	1,642kWh x 7.14p = £ 117.29	1,642kWh x 23.12p = £ 379.64	£ 4,531.87
13	3,270kWh x 19.03p = £ 622.12	1,635kWh x 7.40p = £ 120.98	1,635kWh x 24.28p = £ 396.93	£ 5,671.90
14	3,254kWh x 19.71p = £ 641.32	1,627kWh x 7.67p = £ 124.72	1,627kWh x 25.49p = £ 414.77	£ 6,852.70
15	3,236kWh x 20.42p = £ 660.73	1,618kWh x 7.94p = £ 128.49	1,618kWh x 26.77p = £ 433.17	£ 8,075.10
16	3,217kWh x 21.15p = £ 680.32	1,609kWh x 8.22p = £ 132.30	1,609kWh x 28.11p = £ 452.11	£ 9,339.83
17	3,196kWh x 21.91p = £ 700.06	1,598kWh x 8.52p = £ 136.14	1,598kWh x 29.51p = £ 471.58	£ 10,647.61
18	3,173kWh x 22.69p = £ 719.89	1,586kWh x 8.83p = £ 139.99	1,586kWh x 30.99p = £ 491.57	£ 11,999.07
19	3,148kWh x 23.50p = £ 739.78	1,574kWh x 9.14p = £ 143.86	1,574kWh x 32.54p = £ 512.06	£ 13,394.77
20	3,120kWh x 24.35p = £ 759.67	1,560kWh x 9.47p = £ 147.73	1,560kWh x 34.16p = £ 533.02	£ 14,835.19

16 x Hyundai HIS 250MG

4.00kWp

£ 6,937.43

£ 724.09pa

8y 5m

£ 14,201.55

detailed calc »

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
1	3,344kWh x 12.47p = £ 416.97	1,672kWh x 4.85p = £ 81.09	1,672kWh x 13.52p = £ 226.04	£ -6,213.34
2	3,344kWh x 12.92p = £ 431.89	1,672kWh x 5.02p = £ 83.99	1,672kWh x 14.20p = £ 237.33	£ -5,460.13
3	3,343kWh x 13.38p = £ 447.26	1,671kWh x 5.20p = £ 86.98	1,671kWh x 14.91p = £ 249.13	£ -4,676.77
4	3,341kWh x 13.86p = £ 463.06	1,671kWh x 5.39p = £ 90.05	1,671kWh x 15.65p = £ 261.46	£ -3,862.20
5	3,338kWh x 14.36p = £ 479.27	1,669kWh x 5.58p = £ 93.20	1,669kWh x 16.43p = £ 274.31	£ -3,015.41
6	3,335kWh x 14.87p = £ 495.89	1,667kWh x 5.78p = £ 96.43	1,667kWh x 17.26p = £ 287.71	£ -2,135.38
7	3,330kWh x 15.40p = £ 512.90	1,665kWh x 5.99p = £ 99.74	1,665kWh x 18.12p = £ 301.64	£ -1,221.11
8	3,323kWh x 15.96p = £ 530.27	1,662kWh x 6.21p = £ 103.12	1,662kWh x 19.02p = £ 316.12	£ -271.59
9	3,316kWh x 16.53p = £ 548.01	1,658kWh x 6.43p = £ 106.57	1,658kWh x 19.98p = £ 331.16	£ 714.15
10	3,307kWh x 17.12p = £ 566.08	1,653kWh x 6.66p = £ 110.08	1,653kWh x 20.97p = £ 346.76	£ 1,737.08
11	3,296kWh x 17.73p = £ 584.47	1,648kWh x 6.90p = £ 113.66	1,648kWh x 22.02p = £ 362.92	£ 2,798.13
12	3,284kWh x 18.37p = £ 603.16	1,642kWh x 7.14p = £ 117.29	1,642kWh x 23.12p = £ 379.64	£ 3,898.23
13	3,270kWh x 19.03p = £ 622.12	1,635kWh x 7.40p = £ 120.98	1,635kWh x 24.28p = £ 396.93	£ 5,038.26
14	3,254kWh x 19.71p = £ 641.32	1,627kWh x 7.67p = £ 124.72	1,627kWh x 25.49p = £ 414.77	£ 6,219.07
15	3,236kWh x 20.42p = £ 660.73	1,618kWh x 7.94p = £ 128.49	1,618kWh x 26.77p = £ 433.17	£ 7,441.46
16	3,217kWh x 21.15p = £ 680.32	1,609kWh x 8.22p = £ 132.30	1,609kWh x 28.11p = £ 452.11	£ 8,706.20
17	3,196kWh x 21.91p = £ 700.06	1,598kWh x 8.52p = £ 136.14	1,598kWh x 29.51p = £ 471.58	£ 10,013.97
18	3,173kWh x 22.69p = £ 719.89	1,586kWh x 8.83p = £ 139.99	1,586kWh x 30.99p = £ 491.57	£ 11,365.43
19	3,148kWh x 23.50p = £ 739.78	1,574kWh x 9.14p = £ 143.86	1,574kWh x 32.54p = £ 512.06	£ 12,761.13
20	3,120kWh x 24.35p = £ 759.67	1,560kWh x 9.47p = £ 147.73	1,560kWh x 34.16p = £ 533.02	£ 14,201.55

14 x Sharp 250W Poly

3.50kWp

£ 5,694.75

£ 633.58pa

7y 9m

£ 12,801.85

detailed calc »

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
1	2,926kWh x 12.47p = £ 364.85	1,463kWh x 4.85p = £ 70.95	1,463kWh x 13.52p = £ 197.78	£ -5,061.17
2	2,926kWh x 12.92p = £ 377.90	1,463kWh x 5.02p = £ 73.49	1,463kWh x 14.20p = £ 207.66	£ -4,402.12
3	2,925kWh x 13.38p = £ 391.35	1,462kWh x 5.20p = £ 76.10	1,462kWh x 14.91p = £ 217.99	£ -3,716.68
4	2,923kWh x 13.86p = £ 405.17	1,462kWh x 5.39p = £ 78.79	1,462kWh x 15.65p = £ 228.78	£ -3,003.93
5	2,921kWh x 14.36p = £ 419.36	1,461kWh x 5.58p = £ 81.55	1,461kWh x 16.43p = £ 240.03	£ -2,262.99
6	2,918kWh x 14.87p = £ 433.90	1,459kWh x 5.78p = £ 84.38	1,459kWh x 17.26p = £ 251.74	£ -1,492.96
7	2,913kWh x 15.40p = £ 448.78	1,457kWh x 5.99p = £ 87.27	1,457kWh x 18.12p = £ 263.94	£ -692.97
8	2,908kWh x 15.96p = £ 463.99	1,454kWh x 6.21p = £ 90.23	1,454kWh x 19.02p = £ 276.61	£ 137.86
9	2,901kWh x 16.53p = £ 479.51	1,451kWh x 6.43p = £ 93.25	1,451kWh x 19.98p = £ 289.77	£ 1,000.38
10	2,893kWh x 17.12p = £ 495.32	1,447kWh x 6.66p = £ 96.32	1,447kWh x 20.97p = £ 303.42	£ 1,895.44
11	2,884kWh x 17.73p = £ 511.41	1,442kWh x 6.90p = £ 99.45	1,442kWh x 22.02p = £ 317.56	£ 2,823.87
12	2,873kWh x 18.37p = £ 527.77	1,437kWh x 7.14p = £ 102.63	1,437kWh x 23.12p = £ 332.19	£ 3,786.45
13	2,861kWh x 19.03p = £ 544.35	1,430kWh x 7.40p = £ 105.86	1,430kWh x 24.28p = £ 347.31	£ 4,783.98
14	2,847kWh x 19.71p = £ 561.15	1,424kWh x 7.67p = £ 109.13	1,424kWh x 25.49p = £ 362.93	£ 5,817.18
15	2,832kWh x 20.42p = £ 578.14	1,416kWh x 7.94p = £ 112.43	1,416kWh x 26.77p = £ 379.02	£ 6,886.78
16	2,815kWh x 21.15p = £ 595.28	1,407kWh x 8.22p = £ 115.76	1,407kWh x 28.11p = £ 395.60	£ 7,993.42
17	2,796kWh x 21.91p = £ 612.55	1,398kWh x 8.52p = £ 119.12	1,398kWh x 29.51p = £ 412.64	£ 9,137.73
18	2,776kWh x 22.69p = £ 629.90	1,388kWh x 8.83p = £ 122.50	1,388kWh x 30.99p = £ 430.13	£ 10,320.25
19	2,754kWh x 23.50p = £ 647.31	1,377kWh x 9.14p = £ 125.88	1,377kWh x 32.54p = £ 448.05	£ 11,541.49
20	2,730kWh x 24.35p = £ 664.71	1,365kWh x 9.47p = £ 129.26	1,365kWh x 34.16p = £ 466.39	£ 12,801.85

Earliest Investment Payback:

System

Power

Est Outlay

Feed-In & Savings

Pay back time

Profit over 20yrs

16 x Canadian Solar 250W Mono

4.00kWp

£ 6,303.79

£ 724.09pa

7y 7m

£ 14,835.19

detailed calc »

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
1	3,344kWh x 12.47p = £ 416.97	1,672kWh x 4.85p = £ 81.09	1,672kWh x 13.52p = £ 226.04	£ -5,579.70
2	3,344kWh x 12.92p = £ 431.89	1,672kWh x 5.02p = £ 83.99	1,672kWh x 14.20p = £ 237.33	£ -4,826.50
3	3,343kWh x 13.38p = £ 447.26	1,671kWh x 5.20p = £ 86.98	1,671kWh x 14.91p = £ 249.13	£ -4,043.13
4	3,341kWh x 13.86p = £ 463.06	1,671kWh x 5.39p = £ 90.05	1,671kWh x 15.65p = £ 261.46	£ -3,228.57
5	3,338kWh x 14.36p = £ 479.27	1,669kWh x 5.58p = £ 93.20	1,669kWh x 16.43p = £ 274.31	£ -2,381.78
6	3,335kWh x 14.87p = £ 495.89	1,667kWh x 5.78p = £ 96.43	1,667kWh x 17.26p = £ 287.71	£ -1,501.75
7	3,330kWh x 15.40p = £ 512.90	1,665kWh x 5.99p = £ 99.74	1,665kWh x 18.12p = £ 301.64	£ -587.47
8	3,323kWh x 15.96p = £ 530.27	1,662kWh x 6.21p = £ 103.12	1,662kWh x 19.02p = £ 316.12	£ 362.05
9	3,316kWh x 16.53p = £ 548.01	1,658kWh x 6.43p = £ 106.57	1,658kWh x 19.98p = £ 331.16	£ 1,347.79
10	3,307kWh x 17.12p = £ 566.08	1,653kWh x 6.66p = £ 110.08	1,653kWh x 20.97p = £ 346.76	£ 2,370.71
11	3,296kWh x 17.73p = £ 584.47	1,648kWh x 6.90p = £ 113.66	1,648kWh x 22.02p = £ 362.92	£ 3,431.77
12	3,284kWh x 18.37p = £ 603.16	1,642kWh x 7.14p = £ 117.29	1,642kWh x 23.12p = £ 379.64	£ 4,531.87
13	3,270kWh x 19.03p = £ 622.12	1,635kWh x 7.40p = £ 120.98	1,635kWh x 24.28p = £ 396.93	£ 5,671.90
14	3,254kWh x 19.71p = £ 641.32	1,627kWh x 7.67p = £ 124.72	1,627kWh x 25.49p = £ 414.77	£ 6,852.70
15	3,236kWh x 20.42p = £ 660.73	1,618kWh x 7.94p = £ 128.49	1,618kWh x 26.77p = £ 433.17	£ 8,075.10
16	3,217kWh x 21.15p = £ 680.32	1,609kWh x 8.22p = £ 132.30	1,609kWh x 28.11p = £ 452.11	£ 9,339.83
17	3,196kWh x 21.91p = £ 700.06	1,598kWh x 8.52p = £ 136.14	1,598kWh x 29.51p = £ 471.58	£ 10,647.61
18	3,173kWh x 22.69p = £ 719.89	1,586kWh x 8.83p = £ 139.99	1,586kWh x 30.99p = £ 491.57	£ 11,999.07
19	3,148kWh x 23.50p = £ 739.78	1,574kWh x 9.14p = £ 143.86	1,574kWh x 32.54p = £ 512.06	£ 13,394.77
20	3,120kWh x 24.35p = £ 759.67	1,560kWh x 9.47p = £ 147.73	1,560kWh x 34.16p = £ 533.02	£ 14,835.19

14 x Sharp 230W Poly

3.22kWp

£ 5,128.44

£ 582.89pa

7y 8m

£ 11,888.44

detailed calc »

Annual breakdown for a 3.22kWp system of 14 x 230Wp panels
Facing S @ 35° in a central UK location permits generation of 2,692kWh/pa

Year	FiT Generation	Export Income	In-house savings	Balance
1	2,692kWh x 12.47p = £ 335.66	1,346kWh x 4.85p = £ 65.27	1,346kWh x 13.52p = £ 181.96	£ -4,545.54
2	2,692kWh x 12.92p = £ 347.67	1,346kWh x 5.02p = £ 67.61	1,346kWh x 14.20p = £ 191.05	£ -3,939.22
3	2,691kWh x 13.38p = £ 360.04	1,345kWh x 5.20p = £ 70.02	1,345kWh x 14.91p = £ 200.55	£ -3,308.61
4	2,690kWh x 13.86p = £ 372.76	1,345kWh x 5.39p = £ 72.49	1,345kWh x 15.65p = £ 210.47	£ -2,652.88
5	2,687kWh x 14.36p = £ 385.81	1,344kWh x 5.58p = £ 75.03	1,344kWh x 16.43p = £ 220.82	£ -1,971.22
6	2,684kWh x 14.87p = £ 399.19	1,342kWh x 5.78p = £ 77.63	1,342kWh x 17.26p = £ 231.60	£ -1,262.79
7	2,680kWh x 15.40p = £ 412.88	1,340kWh x 5.99p = £ 80.29	1,340kWh x 18.12p = £ 242.82	£ -526.80
8	2,675kWh x 15.96p = £ 426.87	1,338kWh x 6.21p = £ 83.01	1,338kWh x 19.02p = £ 254.48	£ 237.56
9	2,669kWh x 16.53p = £ 441.15	1,335kWh x 6.43p = £ 85.79	1,335kWh x 19.98p = £ 266.59	£ 1,031.08
10	2,662kWh x 17.12p = £ 455.70	1,331kWh x 6.66p = £ 88.62	1,331kWh x 20.97p = £ 279.14	£ 1,854.54
11	2,653kWh x 17.73p = £ 470.50	1,327kWh x 6.90p = £ 91.50	1,327kWh x 22.02p = £ 292.15	£ 2,708.69
12	2,643kWh x 18.37p = £ 485.54	1,322kWh x 7.14p = £ 94.42	1,322kWh x 23.12p = £ 305.61	£ 3,594.27
13	2,632kWh x 19.03p = £ 500.81	1,316kWh x 7.40p = £ 97.39	1,316kWh x 24.28p = £ 319.53	£ 4,511.99
14	2,619kWh x 19.71p = £ 516.26	1,310kWh x 7.67p = £ 100.40	1,310kWh x 25.49p = £ 333.89	£ 5,462.54
15	2,605kWh x 20.42p = £ 531.89	1,303kWh x 7.94p = £ 103.43	1,303kWh x 26.77p = £ 348.70	£ 6,446.57
16	2,590kWh x 21.15p = £ 547.66	1,295kWh x 8.22p = £ 106.50	1,295kWh x 28.11p = £ 363.95	£ 7,464.68
17	2,573kWh x 21.91p = £ 563.55	1,286kWh x 8.52p = £ 109.59	1,286kWh x 29.51p = £ 379.63	£ 8,517.44
18	2,554kWh x 22.69p = £ 579.51	1,277kWh x 8.83p = £ 112.70	1,277kWh x 30.99p = £ 395.72	£ 9,605.36
19	2,534kWh x 23.50p = £ 595.52	1,267kWh x 9.14p = £ 115.81	1,267kWh x 32.54p = £ 412.21	£ 10,728.90
20	2,512kWh x 24.35p = £ 611.53	1,256kWh x 9.47p = £ 118.92	1,256kWh x 34.16p = £ 429.08	£ 11,888.44

14 x Sharp 235W Poly

3.29kWp

£ 5,248.83

£ 595.57pa

7y 8m

£ 12,137.98

detailed calc »

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
1	2,750kWh x 12.47p = £ 342.96	1,375kWh x 4.85p = £ 66.69	1,375kWh x 13.52p = £ 185.92	£ -4,653.26
2	2,750kWh x 12.92p = £ 355.23	1,375kWh x 5.02p = £ 69.08	1,375kWh x 14.20p = £ 195.20	£ -4,033.75
3	2,749kWh x 13.38p = £ 367.87	1,375kWh x 5.20p = £ 71.54	1,375kWh x 14.91p = £ 204.91	£ -3,389.44
4	2,748kWh x 13.86p = £ 380.86	1,374kWh x 5.39p = £ 74.07	1,374kWh x 15.65p = £ 215.05	£ -2,719.46
5	2,746kWh x 14.36p = £ 394.20	1,373kWh x 5.58p = £ 76.66	1,373kWh x 16.43p = £ 225.62	£ -2,022.97
6	2,743kWh x 14.87p = £ 407.87	1,371kWh x 5.78p = £ 79.32	1,371kWh x 17.26p = £ 236.64	£ -1,299.15
7	2,739kWh x 15.40p = £ 421.86	1,369kWh x 5.99p = £ 82.04	1,369kWh x 18.12p = £ 248.10	£ -547.15
8	2,734kWh x 15.96p = £ 436.15	1,367kWh x 6.21p = £ 84.82	1,367kWh x 19.02p = £ 260.01	£ 233.83
9	2,727kWh x 16.53p = £ 450.74	1,364kWh x 6.43p = £ 87.65	1,364kWh x 19.98p = £ 272.38	£ 1,044.60
10	2,720kWh x 17.12p = £ 465.60	1,360kWh x 6.66p = £ 90.54	1,360kWh x 20.97p = £ 285.21	£ 1,885.96
11	2,711kWh x 17.73p = £ 480.73	1,355kWh x 6.90p = £ 93.49	1,355kWh x 22.02p = £ 298.50	£ 2,758.67
12	2,701kWh x 18.37p = £ 496.10	1,350kWh x 7.14p = £ 96.47	1,350kWh x 23.12p = £ 312.26	£ 3,663.50
13	2,689kWh x 19.03p = £ 511.69	1,345kWh x 7.40p = £ 99.51	1,345kWh x 24.28p = £ 326.47	£ 4,601.18
14	2,676kWh x 19.71p = £ 527.48	1,338kWh x 7.67p = £ 102.58	1,338kWh x 25.49p = £ 341.15	£ 5,572.39
15	2,662kWh x 20.42p = £ 543.45	1,331kWh x 7.94p = £ 105.68	1,331kWh x 26.77p = £ 356.28	£ 6,577.81
16	2,646kWh x 21.15p = £ 559.57	1,323kWh x 8.22p = £ 108.82	1,323kWh x 28.11p = £ 371.86	£ 7,618.05
17	2,629kWh x 21.91p = £ 575.80	1,314kWh x 8.52p = £ 111.97	1,314kWh x 29.51p = £ 387.88	£ 8,693.70
18	2,610kWh x 22.69p = £ 592.11	1,305kWh x 8.83p = £ 115.15	1,305kWh x 30.99p = £ 404.32	£ 9,805.28
19	2,589kWh x 23.50p = £ 608.47	1,294kWh x 9.14p = £ 118.33	1,294kWh x 32.54p = £ 421.17	£ 10,953.24
20	2,566kWh x 24.35p = £ 624.83	1,283kWh x 9.47p = £ 121.51	1,283kWh x 34.16p = £ 438.41	£ 12,137.98

Greatest Annual Income:

System

Power

Est Outlay

Feed-In & Savings

Pay back time

Profit over 20yrs

20 x Sanyo HIT N240SE10

4.80kWp

£ 11,142.94

£ 821.96pa

11y 2m

£ 12,917.44

detailed calc »

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
1	4,013kWh x 11.30p = £ 453.41	2,006kWh x 4.85p = £ 97.30	2,006kWh x 13.52p = £ 271.25	£ -10,320.97
2	4,012kWh x 11.70p = £ 469.64	2,006kWh x 5.02p = £ 100.79	2,006kWh x 14.20p = £ 284.79	£ -9,465.76
3	4,011kWh x 12.12p = £ 486.35	2,006kWh x 5.20p = £ 104.37	2,006kWh x 14.91p = £ 298.96	£ -8,576.08
4	4,009kWh x 12.56p = £ 503.53	2,005kWh x 5.39p = £ 108.06	2,005kWh x 15.65p = £ 313.75	£ -7,650.74
5	4,006kWh x 13.01p = £ 521.17	2,003kWh x 5.58p = £ 111.84	2,003kWh x 16.43p = £ 329.18	£ -6,688.55
6	4,002kWh x 13.48p = £ 539.24	2,001kWh x 5.78p = £ 115.72	2,001kWh x 17.26p = £ 345.25	£ -5,688.34
7	3,996kWh x 13.96p = £ 557.73	1,998kWh x 5.99p = £ 119.69	1,998kWh x 18.12p = £ 361.97	£ -4,648.96
8	3,988kWh x 14.46p = £ 576.63	1,994kWh x 6.21p = £ 123.74	1,994kWh x 19.02p = £ 379.35	£ -3,569.24
9	3,979kWh x 14.98p = £ 595.91	1,989kWh x 6.43p = £ 127.88	1,989kWh x 19.98p = £ 397.39	£ -2,448.05
10	3,968kWh x 15.51p = £ 615.56	1,984kWh x 6.66p = £ 132.10	1,984kWh x 20.97p = £ 416.11	£ -1,284.27
11	3,955kWh x 16.07p = £ 635.56	1,978kWh x 6.90p = £ 136.39	1,978kWh x 22.02p = £ 435.50	£ -76.81
12	3,940kWh x 16.65p = £ 655.88	1,970kWh x 7.14p = £ 140.75	1,970kWh x 23.12p = £ 455.57	£ 1,175.39
13	3,924kWh x 17.24p = £ 676.50	1,962kWh x 7.40p = £ 145.18	1,962kWh x 24.28p = £ 476.31	£ 2,473.38
14	3,905kWh x 17.86p = £ 697.38	1,952kWh x 7.67p = £ 149.66	1,952kWh x 25.49p = £ 497.73	£ 3,818.14
15	3,884kWh x 18.50p = £ 718.49	1,942kWh x 7.94p = £ 154.19	1,942kWh x 26.77p = £ 519.80	£ 5,210.62
16	3,860kWh x 19.16p = £ 739.79	1,930kWh x 8.22p = £ 158.76	1,930kWh x 28.11p = £ 542.53	£ 6,651.71
17	3,835kWh x 19.85p = £ 761.25	1,917kWh x 8.52p = £ 163.37	1,917kWh x 29.51p = £ 565.90	£ 8,142.22
18	3,807kWh x 20.56p = £ 782.82	1,904kWh x 8.83p = £ 167.99	1,904kWh x 30.99p = £ 589.89	£ 9,682.92
19	3,777kWh x 21.30p = £ 804.44	1,889kWh x 9.14p = £ 172.63	1,889kWh x 32.54p = £ 614.47	£ 11,274.47
20	3,744kWh x 22.06p = £ 826.07	1,872kWh x 9.47p = £ 177.28	1,872kWh x 34.16p = £ 639.62	£ 12,917.44

20 x Sanyo HIT N235SE10

4.70kWp

£ 10,891.11

£ 804.84pa

11y 2m

£ 12,668.01

detailed calc »

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
1	3,929kWh x 11.30p = £ 443.97	1,964kWh x 4.85p = £ 95.28	1,964kWh x 13.52p = £ 265.60	£ -10,086.27
2	3,929kWh x 11.70p = £ 459.85	1,964kWh x 5.02p = £ 98.69	1,964kWh x 14.20p = £ 278.86	£ -9,248.87
3	3,928kWh x 12.12p = £ 476.22	1,964kWh x 5.20p = £ 102.20	1,964kWh x 14.91p = £ 292.73	£ -8,377.73
4	3,926kWh x 12.56p = £ 493.04	1,963kWh x 5.39p = £ 105.81	1,963kWh x 15.65p = £ 307.21	£ -7,471.66
5	3,923kWh x 13.01p = £ 510.31	1,961kWh x 5.58p = £ 109.51	1,961kWh x 16.43p = £ 322.32	£ -6,529.52
6	3,918kWh x 13.48p = £ 528.00	1,959kWh x 5.78p = £ 113.31	1,959kWh x 17.26p = £ 338.05	£ -5,550.16
7	3,912kWh x 13.96p = £ 546.11	1,956kWh x 5.99p = £ 117.20	1,956kWh x 18.12p = £ 354.43	£ -4,532.42
8	3,905kWh x 14.46p = £ 564.61	1,953kWh x 6.21p = £ 121.17	1,953kWh x 19.02p = £ 371.45	£ -3,475.20
9	3,896kWh x 14.98p = £ 583.50	1,948kWh x 6.43p = £ 125.22	1,948kWh x 19.98p = £ 389.12	£ -2,377.37
10	3,885kWh x 15.51p = £ 602.74	1,943kWh x 6.66p = £ 129.35	1,943kWh x 20.97p = £ 407.44	£ -1,237.84
11	3,873kWh x 16.07p = £ 622.32	1,936kWh x 6.90p = £ 133.55	1,936kWh x 22.02p = £ 426.43	£ -55.53
12	3,858kWh x 16.65p = £ 642.22	1,929kWh x 7.14p = £ 137.82	1,929kWh x 23.12p = £ 446.08	£ 1,170.59
13	3,842kWh x 17.24p = £ 662.40	1,921kWh x 7.40p = £ 142.15	1,921kWh x 24.28p = £ 466.39	£ 2,441.54
14	3,823kWh x 17.86p = £ 682.85	1,912kWh x 7.67p = £ 146.54	1,912kWh x 25.49p = £ 487.36	£ 3,758.28
15	3,803kWh x 18.50p = £ 703.52	1,901kWh x 7.94p = £ 150.98	1,901kWh x 26.77p = £ 508.97	£ 5,121.75
16	3,780kWh x 19.16p = £ 724.38	1,890kWh x 8.22p = £ 155.45	1,890kWh x 28.11p = £ 531.23	£ 6,532.81
17	3,755kWh x 19.85p = £ 745.39	1,878kWh x 8.52p = £ 159.96	1,878kWh x 29.51p = £ 554.11	£ 7,992.28
18	3,728kWh x 20.56p = £ 766.51	1,864kWh x 8.83p = £ 164.49	1,864kWh x 30.99p = £ 577.60	£ 9,500.87
19	3,698kWh x 21.30p = £ 787.68	1,849kWh x 9.14p = £ 169.04	1,849kWh x 32.54p = £ 601.67	£ 11,059.26
20	3,666kWh x 22.06p = £ 808.86	1,833kWh x 9.47p = £ 173.58	1,833kWh x 34.16p = £ 626.30	£ 12,668.01

18 x Sanyo HIT H250E01

4.50kWp

£ 9,250.84

£ 770.59pa

10y 1m

£ 13,305.76

detailed calc »

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
1	3,762kWh x 11.30p = £ 425.08	1,881kWh x 4.85p = £ 91.22	1,881kWh x 13.52p = £ 254.29	£ -8,480.25
2	3,762kWh x 11.70p = £ 440.29	1,881kWh x 5.02p = £ 94.49	1,881kWh x 14.20p = £ 266.99	£ -7,678.49
3	3,761kWh x 12.12p = £ 455.95	1,880kWh x 5.20p = £ 97.85	1,880kWh x 14.91p = £ 280.27	£ -6,844.41
4	3,759kWh x 12.56p = £ 472.06	1,879kWh x 5.39p = £ 101.31	1,879kWh x 15.65p = £ 294.14	£ -5,976.90
5	3,756kWh x 13.01p = £ 488.59	1,878kWh x 5.58p = £ 104.85	1,878kWh x 16.43p = £ 308.60	£ -5,074.85
6	3,752kWh x 13.48p = £ 505.53	1,876kWh x 5.78p = £ 108.49	1,876kWh x 17.26p = £ 323.67	£ -4,137.16
7	3,746kWh x 13.96p = £ 522.87	1,873kWh x 5.99p = £ 112.21	1,873kWh x 18.12p = £ 339.35	£ -3,162.74
8	3,739kWh x 14.46p = £ 540.59	1,869kWh x 6.21p = £ 116.01	1,869kWh x 19.02p = £ 355.64	£ -2,150.50
9	3,730kWh x 14.98p = £ 558.67	1,865kWh x 6.43p = £ 119.89	1,865kWh x 19.98p = £ 372.56	£ -1,099.38
10	3,720kWh x 15.51p = £ 577.09	1,860kWh x 6.66p = £ 123.84	1,860kWh x 20.97p = £ 390.11	£ -8.34
11	3,708kWh x 16.07p = £ 595.84	1,854kWh x 6.90p = £ 127.87	1,854kWh x 22.02p = £ 408.29	£ 1,123.65
12	3,694kWh x 16.65p = £ 614.89	1,847kWh x 7.14p = £ 131.96	1,847kWh x 23.12p = £ 427.10	£ 2,297.59
13	3,678kWh x 17.24p = £ 634.22	1,839kWh x 7.40p = £ 136.10	1,839kWh x 24.28p = £ 446.54	£ 3,514.46
14	3,661kWh x 17.86p = £ 653.79	1,830kWh x 7.67p = £ 140.30	1,830kWh x 25.49p = £ 466.62	£ 4,775.17
15	3,641kWh x 18.50p = £ 673.58	1,820kWh x 7.94p = £ 144.55	1,820kWh x 26.77p = £ 487.32	£ 6,080.62
16	3,619kWh x 19.16p = £ 693.55	1,810kWh x 8.22p = £ 148.84	1,810kWh x 28.11p = £ 508.63	£ 7,431.64
17	3,595kWh x 19.85p = £ 713.67	1,798kWh x 8.52p = £ 153.15	1,798kWh x 29.51p = £ 530.53	£ 8,829.00
18	3,569kWh x 20.56p = £ 733.89	1,785kWh x 8.83p = £ 157.49	1,785kWh x 30.99p = £ 553.02	£ 10,273.40
19	3,541kWh x 21.30p = £ 754.16	1,770kWh x 9.14p = £ 161.84	1,770kWh x 32.54p = £ 576.07	£ 11,765.48
20	3,510kWh x 22.06p = £ 774.44	1,755kWh x 9.47p = £ 166.20	1,755kWh x 34.16p = £ 599.64	£ 13,305.76

These estimates are calculated by comparing over 50 MCS certified panels to determine the best possible payback. Assuming that you pay 13.52p 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 13.52p 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).

Want this solar calculator on your website? Click here for details