Monthly figures Income from and for electricity balances etc.

Rates for energy per KWh Exported and Imported 2009

Although we had the systems installed last year these records only commenced at the start of this financial year 2009/10

Exported to the N/Grid Per KWh 28p

Imported from the N/grid for first 1000KWh per annum (4 x 250 per quarter)monthly =(4 x 84 units + 8 x 83 units for 8 Months = 1000PA @ 19.00p) thereafter 13.00p
E7 Night Rate Imported 5.33p KWh
Month Exported £ KWh Used in House Value £ E7 Imported Cost E7 Night Cost Debit Credit Monthly Balance Accu Balance
December 2008 87 £21.84 100 £9.49 311 84 @ 19p.£15.96 227 @ 13p £29.51 £45.47 104 £4.26 £49.73 21.84 27.89 £0.00
January 79 £22.12 120 £7.55 520 84 @ 19p.£15.96 436 @ 13p £56.68 £72.64 134 £4.26 £76.90 £55.72 £21.18 £0.00
February 120 £34.16 106 £8.1 194 84 @ 19p.£15.96 110 @ 13p £14.30 £30.26 80 £4.26 £34.52 £34.16 00.36 00.00
March 278 £77.84 177 £23.01 209 84 @ 19p.£15.96 125 @ 13p £16.25 £32.21 80 £4.26 £36.47 77.84 £41.37 £40.99
April 310 £86.00 152 £19.76 189 83 @ 19p.£15.77 106 @ 13p £13.78 29.55 97 £5.17 £34.72 £86.00 £51.28 £92.27
May 325 £91.00 199 £25.87 202 83 @ 19p.£15,77 119 @ 13p £15.47 £31.24 98 £5.23 £36.47 £91.00 £54.53 £98.84
June 364 £101.92 198 £25.74 125 83 @ 19p. £15.77 42 @ 13p £5.46 £21.23 59 £3.14 £26.89 £101.92 £75.03 £146.80
July 325 £91.00 187 £48.64 149 83 @ 19p. £15.77 66 @ 13p £8.58 £24.35 71 £3.90 £28.25 £91.00 £62.75 £209.55
August 284 £79.52 183 23.79 157 83 @ 19p. £15.77 74 @ 13p £9.62 £25.39 75 £4.13 £29.52 £79.52 50.00 £259.55
September 274 £76.72 153 £19.89 179 83 @ 19p. £15.77 96 @ 13p £12.48 £28.25. 62 £3.30 £31.55 £76.72 £45.17 £304.72
October 144 £40.32 107 £13.91 25983 @ 19p.£15.77 176 @ 13p £22.88 £38.65 108 £5.76 £44.41 £40.32 £4.09 £300.64
November 95 £26.60 52 £6.76 201 83 @ 19p. £15.77 118 @ 13p.£15.34 £31.11 87 £4.63 £35.74 £26.60 £9.14 £291.50
December 2009 76 £21.28 62 £8.06 236 83 @ 19p. £15.77 236@ 13p.£30.68 £46.45 140 £7.46 £54.91 £21.28 £33.63 £257.87
January 2010 65 £18.20 75 £9.75 30883 @ 19p. £15.77, 225 @ 13p.£29.25 £45.02 151 £8.05 £53.07 £18.20 £34.87 £223.00
February 98 £27.44 72 £9.36 243 83 @ 19p. £15.77 160 @ 13p. £20.80" 36.57 84 £4.47 £41.04 £27.44 £13.60 £209.40
March 83 @ 19p. £15.77 @ 13p.
April
May
June
July




Total Energy Dec 2008 - Nov 2009
Total Photovoltaic Generation KWh 4722Kwh
Total used in House 1979KWh
Total exported to Nat grid 2743HWh
Total Imported from Nat grid (Day only) 2583KWh



These figures which are based on actual meter reading clearly indicate that solar energy is viable for 8 months of the year, the remaining four months requiring power from the National grid. The installation is only a viable proposition on the basis that it over the period of the year what is taken from the national grid is returned during the summer months along with a small additional amount generated. Just under 2/5ths, approximately of the total generated is used in house.

based on the return for the year 08/09


It appears that for the year 08/09 the total return off the costs was:- £291.00 balance
plus the cost of electricity for the year which was.........................................£440.00
Plus the value of the units used in house @ 13pKWh................................. £257.00
return was:- ........................................................................................................... £998.00

The cost of the installation at this address was approx £28,500.00 2009 therefore even at the present rates of return it will take 26+ years to pay for itself excluding interest earned on the invested capital.
However if the proposals in the Governments bill 7/2009 are implemented as is i.e the 50% of what is currently being paid by my electricity supplier Southern Electric then the monies invested will never be recouped as the total monies paid for exported energy will be absorbed by the cost of the imported units at today's costs for power it would take a life time to recoup the monies invested.
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 Billing periods
6th October 2008-9th March 2009
10th March 2009-11th June 2009
12th June 2009-11th Sept 2009
12th Sept 2009-11th Dec 2009
12th Dec 2009-11th March 2110