Our Solar range was installed on the 12th September 2016 so last week saw it reach its first anniversary.
In part 2 of our Going Solar series, I wrote that our system “has a predicted annual generation figure of 3,400 kWh“. So how has it carried out compared to that expectation?
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Well I’m pleased to report that despite what was, in part, another fairly grey and miserable northern Irish summer, our solar range has out-performed predictions.
With 3,497 kWh’s generated in the last year we can calculate that the ROCs payments will be around £420, slightly above our prediction (£408).
We’ve had an export meter installed because 14th December 2016 and have only sent 385 units back to the grid because then (and 185 of that was when we were away on holiday). So our predicted export income of £51 will probably end up much more like just £14.
But of course this is good news, it implies we really are using the large majority of what we generate. It’s much better to use the electrical power yourself (rather than have to purchase it in at £0.13), than to give it away for only £0.03 per unit. I estimate our self-consumption rate at around 87% which is even better than the 70% I had predicted.
Predicted
1. EXPORT: 3,400 kWh x 50% x £0.03 = £51
2. ROC: 3,400 kWh x £0.12 = £408
3. SAVINGS: 3,400 kWh x 70% x £0.1343 = £319
TOTAL: £778
Payback ~ 6.4 years
Faktisk
1. EXPORT: 3,497 kWh x 13% x £0.03 = £14
2. ROC: 3,497 kWh x £0.12 = £420
3. SAVINGS: 3,497 kWh x 87% x £0.1343 = £409
TOTAL: £843
Payback ~ 5.9 years
While the government incentives are now gone (check out part 2 for an explanation of ROCSs ) prices have continued to fall. I recently discovered a local company advertising a 4kW system for £3,499 + 5% VAT installed.
We’ve hit 87% self-consumption with the help of the Solar iBoost , but with an EV in the garage, the dream is to install a battery and decrease our reliance on the grid as much as possible. check out Robert Llewellyn’s fully Charged show video which shows what can be done. Yes, the economics aren’t there yet, but it’s getting closer and closer.
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1
ECO-WORTHY 100 Watt 12V Solar Panels kit + 20A charge Controller for Off-Grid 12 Volt Battery System
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ECO-WORTHY 100W Solar Panel kit Off-Grid System: 100W 12V Monocrystalline Solar Panel with 20A…
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Read the full Going SolarSerier…
Going Solar Part 1 – Installera ett 4KW PV -sortiment hos det automatiserade hemmet
Going Solar Part 2 – Kostnader, incitament och återbetalningstid
Going Solar Part 3 – Jag handlade i min Range Rover för ett Nissan Leaf
Going Solar Part 4 – Jag mäter varje 24/7 elektrisk enhet i det automatiserade hemmet
Going Solar Part 5 – Våra PV -system Faktiska generationssiffror efter första hela året
Going Solar Part 6 – Hela första års “bränslekostnader för Nissan Leaf EV – 235 £
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