Solar PV installation – second review

Elsdon PV

In August 2011 I had a 3.9kW solar PV installation popped on the house roof. I was fortunate enough to get that in before the government reduced the Feed in Tariff (FiT) payout from its initial £0.43 per kW hour generated. That said, PV installation costs soon dropped along with the FiT, so by today’s standards I did pay over the odds for the installation.

I now have both a full year’s worth of data, from August 24th 2011 to August 23rd 2012, and a full calendar year of data for 2012.

Full year data

In the first 365 days of service my PV array generated 3,690kWh of electricity. That’s a significant contribution! Financially, with inflation and export top-up, it amounted to just shy of a £1,700 payout, or more than an eighth of the installation fee. I’m pretty pleased with that – I’ll have paid this off before I turn 40!

2013 review

The graph below shows house consumption in blue bars, and generated power as the green line.

2012 solar PV

The trends are pretty much as I’d expect. We consume a lot more power in the winter. I think December is higher than January and February mainly because I was around the house more, and doing quite a bit of work in the garage which required heating. The major step down in the spring and up in the autumn mark the points at which the storage heaters are switched off and on. We naturally generate a lot more power in the summer.

I’m sad to note that we don’t produce as much power as we consume even in the summer months. I’m certain this is because our hot water is stored in an immersion heater which is charged at night. This year I will investigate solar thermal water heating, although with such a massive PV array already in place, locating it may be quite a challenge!

2 comments so far

  1. Rhydian Evans on February 15th, 2021 08:02

    Hi Neil – not sure you’re still in the same house but what do the figures show now? (it’s a bit sad but I remember you doing this back in 2011 – I’ve been following your car history ever since the e30 m3…..think you were on a forum or something and that lead me to your own website – either way – it’s been a long time!), Rhyd

  2. Neil Mukerji on August 14th, 2021 21:11

    Hello! Just noticed your comment from *checks notes* half a year ago…

    The inverter was replaced a couple of years ago under warranty but otherwise the system has performed flawlessly. It still gives the same kind of output without noticeable degradation. I’ll have had the solar PV rig for 10 years this month. I’ve extended the house which gave room for a 2m x 2m solar thermal rig too so the hot water is directly heated by that now as well.

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