Unrewarding small-scale solar installation
All of the new-build houses on our small development came with a small 1kW solar installation.
We moved in over a year ago and I've enough data to see that it's benefited us to the tune of a princely £135/year. That's £54 of earnings and £82 worth of reduced grid consumption.
The panels generated 900kWh over the year. We don't know how much we paid for them as that cost was hidden in the total purchase price. My hunch is that their lifespan might be shorter than the payback period. Still, we've avoided a small amount of carbon emissions I suppose.
It's a good lesson in the economics of small-scale solar PV, which aren't favourable in homes which have low energy needs like ours.
The sad thing is the roof could have probably accommodated a 4kW system that would have earned us another £400/year.
I receive 15p/kWh with the Octopus SEG, which is comparable with the rate for daytime import on Agile.
3 bed det. built 2021. 2 occupants at home all day. Worcester Bosch Greenstar 30i combi boiler heating to 19-20C from 6am to midnight, setback to 17.5C overnight, connected in EMS mode to Tado smart modulating thermostat. Annual gas usage 6000kWh; electricity 2000kWh.
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