email mark@rosher.net

Solar Export Meter

So, I’m going to note the generation we manage from the 4kWp solar PV on the roof, installed end of November 2013e. For background on this page, click the ‘solar’ category in the top menu, and for an explanation of the figures, read this next waffle.

It’s important to note that the “£ cumulative” is solely the earned cash return from the generation.
Savings on fuel bills are extra and potentially larger.

To clarify, in addition to the cash return on electricity generated there is the cash not spent on the electricity that would have been imported but for the generation, plus the cash not spent on gas that isn’t being used to heat the water (given the solar diverter does that instead). Each monthly solar blog page (click solar on the top menu for the first twelve months readings) tries to detail how much money overall has moved in either direction.

The £(Gen+Exp) is the presumed payment for the month, according to the current regulations. There is a FiT (feed in tariff) Generation payment of (originally) 14.9p for every unit (kWh) of electricity generated, and also an export payment of 4.64p per unit for 50% of the electricity generated, assuming you use half of it yourself. Makes sense, of course, to use as much of it as you can… so if we generated 50 units of electricity there would be a payment of (14.9 x 50) + (4.64 x (50/2)) = £8.61. Paid quarterlyI think it’s tax free. I think it’s index linked. I think I’m right. Time will tell. Finally, because we have generated 50 units we’ve not had to import them, at 12.45p/kWh, so that’s an additional saving of (50 x 12.45) = £6.22 bringing the overall cash equivalent return of the example 50 generated units to £14.83.

  • May 2014. To confuse us further, SSE sent the contract through and the FiT rate from 1st April is 15.3p and the Export rate is 4.77p. I’ve amended the cash figures to reflect that… let’s see if the eventual cheque at all closely matches the calculations! (And they do!)
  • October 2015. I note that on 1st April 2015 the figures changed again, to 15.54p and 4.85p, FIT and export respectively. Second year chart figures recalculated accordingly.
  • from 1st April 2016 our FITs are 15.73p and 4.91p.

1. In July I had a payment of £188.66 which covered December through 12th May 2014
2. In October 2014ce I had a payment of £374.18 covering period up to 30th September.
3. In March 2015ce I had a bank credit for £80.84 covering up to meter reading 3664
4. In November 2015ce I received £585.42 covering meter readings to 6930 (read 13th October).
5. In April 2016ce the FIT was £153.69 covering meter readings to 7784 (meter read 14th April)
6. 16th August meter at 9126 FIT paid £244.03
7. 23rd January 2017  meter reading 10567 FIT payment £261.31

Total cash to date = £1888.13 (ignoring the saving on reduction of gas and electric energy imports)

The first year… 2014

Month end Meter Reading kWh Generated £(Gen+Exp) £ cumulative
December 2013 0066.15 0067 £11.53 £11.53
January 2014 0138.52 0072 £12.39 £23.92
February 2014 0285.14 0147 £25.31 £49.23
March 2014 0577.48 0292 £50.28 £99.51
April 2014 0928.80 0351 £60.44 £159.95
May 2014 1382.75 0441 £77.99 £237.94
June 2014 1921.64 0539 £95.32 £333.26
July 2014 2471.08 0549 £97.17 £430.43
August 2014 2866.83 0396 £69.99 £500.42
September 2014 3206.82 0340 £60.13 £560.55
October 2014 3379.82 0173 £30.60 £591.15
November 2014 3476.27 0096 £17.06 £608.21
December 2014 3552 0075 £13.39 £621.60

The Second Year… 2015

Month end Meter Reading kWh Generated £(Gen+Exp) £ cumulative
December 2014 3552 0075 £13.39 £621.60
January 2015 3641 0089 £15.74 £637.34
February 2015 3777 0136 £24.05 £661.39
March 2015 4052 0275 £48.64 £710.03
April 2015 4530 0478 £85.87 £795.90
May 2015 5030 0500 £89.83 £885.73
June 2015 5607 0577 £103.65 £989.38
July 2015 6129 0522 £93.77 £1083.15
August 2015 6479 0350 £62.88 £1146.03
September 2015 6839 0360 £64.67 £1210.70
October 2015 7010 0171 £30.72 £1241.42
November 2015 7073 0063 £11.32 £1252.74
December 2015 7118 0045 £08.08 £1260.82

The Third Year… 2016

Month end Meter Reading kWh Generated £(Gen+Exp) £ cumulative
December 2015 7118 0045 £08.08 £1260.82
January 2016 7196 0078 £14.01 £1274.83
February 2016 7368 0172 £30.90 £1305.73
March 2016 7616 0248 £45.10 £1350.83
April 2016 8015 0399 £72.56 £1423.39
May 2016 8505 0490 £89.11 £1512.50
June 2016 8950 0445 £80.92 £1593.42
July 2016 9446 0496 £90.20 £1683.62
August 2016 9881 0435 £79.10 £1762.82
September 2016 10157 0276 £50.19 £1812.91
October 2016 10362 0205 £37.28 £1850.19
November 2016 10465 0103 £18.73 £1868.92
December 2016 10544 0079 £14.37 £1883.29

The Fourth Year… 2017

Month end Meter Reading kWh Generated £(Gen+Exp) £ cumulative
December 2015 10544 0079 £14.37 £1883.29
January 2016 10610 0066 £12.00 £1895.29
February 2016 10730 0120 £21.82 £1917.11
March 2016 0000 0000 £00.00 £
April 2016 0000 0000 £00.00 £
May 2016 0000 0000 £00.00 £
June 2016 0000 0000 £00.00 £
July 2016 0000 0000 £00.00 £
August 2016 0000 0000 £00.00 £
September 2016 0000 0000 £00.00 £
October 2016 0000 0000 £00.00 £
November 2016 0000 0000 £00.00 £
December 2016 0000 0000 £00.00 £