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Calculations Table
| year | energy Cost | Export Tariff perKw/h | Fit Tariff per Kw/h | Solar energy produced | Income from solar panels | Energy cost saving | Total income- Savings | ROI % | Costs | South 4KW Cost/Payback |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.14 | 0.031 | 0.21 | 3433.6 | £ | £8,300 | -£8,300 | ||||
| 1 | £0.14 | £0.03 | £0.21 | 3433.6 | £774.28 | £240.35 | £1,014.63 | 12.22% | £50 | -£7,335 |
| 2 | £0.15 | £0.03 | £0.22 | 3433.6 | £797.51 | £257.90 | £1,055.40 | 12.72% | £50 | -£6,330 |
| 3 | £0.16 | £0.03 | £0.22 | 3433.6 | £821.43 | £276.72 | £1,098.15 | 13.23% | £50 | -£5,282 |
| 4 | £0.17 | £0.03 | £0.23 | 3433.6 | £846.07 | £296.93 | £1,143.00 | 13.77% | £50 | -£4,189 |
| 5 | £0.19 | £0.03 | £0.24 | 3433.6 | £871.46 | £318.60 | £1,190.06 | 14.34% | £50 | -£3,049 |
| 6 | £0.20 | £0.04 | £0.24 | 3433.6 | £897.60 | £341.86 | £1,239.46 | 14.93% | £50 | -£1,859 |
| 7 | £0.21 | £0.04 | £0.25 | 3433.6 | £924.53 | £366.81 | £1,291.34 | 15.56% | £50 | -£618 |
| 8 | £0.23 | £0.04 | £0.26 | 3433.6 | £952.26 | £393.59 | £1,345.85 | 16.22% | £50 | £678 |
| 9 | £0.25 | £0.04 | £0.27 | 3433.6 | £980.83 | £422.32 | £1,403.15 | 16.91% | £50 | £2,031 |
| 10 | £0.26 | £0.04 | £0.27 | 3433.6 | £1,010.26 | £453.15 | £1,463.41 | 17.63% | £50 | £3,444 |
| 11 | £0.28 | £0.04 | £0.28 | 3090.24 | £936.51 | £437.61 | £1,374.12 | 16.56% | £50 | £4,769 |
| 12 | £0.30 | £0.04 | £0.29 | 3090.24 | £964.60 | £469.56 | £1,434.16 | 17.28% | £50 | £6,153 |
| 13 | £0.33 | £0.04 | £0.30 | 3090.24 | £993.54 | £503.83 | £1,497.37 | 18.04% | £50 | £7,600 |
| 14 | £0.35 | £0.05 | £0.31 | 3090.24 | £1,023.35 | £540.61 | £1,563.96 | 18.84% | £50 | £9,114 |
| 15 | £0.38 | £0.05 | £0.32 | 3090.24 | £1,054.05 | £580.08 | £1,634.12 | 19.69% | £1,250 | £9,498 |
| 16 | £0.40 | £0.05 | £0.33 | 3090.24 | £1,085.67 | £622.42 | £1,708.09 | 20.58% | £50 | £11,156 |
| 17 | £0.43 | £0.05 | £0.34 | 3090.24 | £1,118.24 | £667.86 | £1,786.10 | 21.52% | £50 | £12,892 |
| 18 | £0.46 | £0.05 | £0.35 | 3090.24 | £1,151.79 | £716.61 | £1,868.40 | 22.51% | £50 | £14,711 |
| 19 | £0.50 | £0.05 | £0.36 | 3090.24 | £1,186.34 | £768.93 | £1,955.27 | 23.56% | £50 | £16,616 |
| 20 | £0.53 | £0.05 | £0.37 | 3090.24 | £1,221.93 | £825.06 | £2,046.99 | 24.66% | £50 | £18,613 |
| 21 | £0.57 | £0.06 | £0.38 | 2746.88 | £1,118.74 | £786.92 | £1,905.67 | 22.96% | £50 | £20,469 |
| 22 | £0.61 | £0.06 | £0.39 | 2746.88 | £1,152.31 | £844.37 | £1,996.67 | 24.06% | £50 | £22,415 |
| 23 | £0.66 | £0.06 | £0.40 | 2746.88 | £1,186.88 | £906.01 | £2,092.88 | 25.22% | £50 | £24,458 |
| 24 | £0.71 | £0.06 | £0.41 | 2746.88 | £1,222.48 | £972.15 | £2,194.63 | 26.44% | £50 | £26,603 |
| 25 | £0.76 | £0.06 | £0.43 | 2746.88 | £1,259.16 | £1,043.11 | £2,302.27 | 27.74% | £50 | £28,855 |
| 26 | £0.81 | £0.06 | £0.00 | 2746.88 | £89.15 | £1,119.26 | £1,208.41 | £50 | £30,014 | |
| 27 | £0.87 | £0.07 | £0.00 | 2746.88 | £91.82 | £1,200.97 | £1,292.79 | £50 | £31,256 | |
| 28 | £0.94 | £0.07 | £0.00 | 2746.88 | £94.58 | £1,288.64 | £1,383.21 | £50 | £32,590 | |
| 29 | £1.01 | £0.07 | £0.00 | 2746.88 | £97.41 | £1,382.71 | £1,480.12 | £50 | £34,020 | |
| 30 | £1.08 | £0.07 | £0.00 | 2746.88 | £100.33 | £1,483.64 | £1,583.98 | £50 | £35,554 |
These calculations are based on the following;
- 4KW system
- 30 degree pitch
- Zero shading
- 7.3% raise of energy prices per year based on DECC Quarterly energy price December 2011
- 3% raise of inflation per year
- Efficiency drop of panels
- Maintenance costs and inverter swap
For your alternative calculations, click here
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