#1 Sept. 19, 2014 18:33:00

rogerhoward
From: Southend
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Double-decade Performance


94.5% of original generation from 20 years ago (compared to 80% originally predicted) is what is reported from the UK’s first grid connected solar system .


Featuring the first SMA inverter to be installed in the UK, the Autonomous House was purpose-built to be a genuinely European-style 20th century low-energy home.


In 1994 electricity prices were apparently so low as to make the payback period appear to be 200 years, whereas it now seems that electricity prices are predicted to double over the next 5 years!










Economy 10 tariff provides 6.9p/kWh off-peak import between 12am-5am, 1pm-4pm and 8pm-10pm; http://www.pvoutput.org/aggregate.jsp?id=21047&sid=18934&v=2&t=m on approx. 63% off-peak usage, 22% solar usage, and 15% peak-rate usage.
1,900kWh annually is exported, mostly in summer, on approx. 3,200kWh generation. Approx. 4,500kWh/year is imported, mostly for (a) winter and springtime off-peak Storage Heaters, and (b) off-peak hot water Immersion heating (which is “dumb”, i.e. not linked to the solar PV).
PV array is split East-West. Income is from Phase II 21p/kWh Feed-in-Tariff plus smart metered 3.2p/kWh Export Tariff.

Edited rogerhoward (Sept. 19, 2014 18:33:00)

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#2 Sept. 22, 2014 11:39:00

bhommels
Registered: 2011-10-03
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Double-decade Performance


Amazing! I love the detail about the oak frame, very stylish.


Looking at the numbers the 2.16kW(p?) array averaged 764 kW/kWp. Not too bad for a system of 20 years ago.


I am a bit puzzled as to why the system is only performing at 80% of its original output, while the first test on the panels indicated they are at 94.5% of their initial output specification. Unfortunately the article does not elaborate on why this might be.


I guess it will take another 15 years to see whether more modern PV systems hold up as well as this one… fingers crossed.





Edited bhommels (Sept. 22, 2014 11:39:00)

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#3 Sept. 23, 2014 13:28:00

Capetown
From: The Banks Of The River Mole
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Double-decade Performance


Also the inverter lasted 14 years!







The gene pool has no lifeguard!

Edited Capetown (Sept. 23, 2014 13:28:00)

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#4 Sept. 23, 2014 14:14:00

bhommels
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Aha. The article at windandsun.co.uk says that the first panel tested produced the 94.5% figure.





Edited bhommels (Sept. 23, 2014 14:14:00)

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#5 Sept. 23, 2014 17:01:00

SteveRogers
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Double-decade Performance


It doesn't say the inverter failed but that it was upgraded in 2008.


Steve


URN 215 North Yorkshire 3.96 kWp, S facing, 40 deg tilt, minor shading





Edited SteveRogers (Sept. 23, 2014 17:01:00)

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#6 Sept. 23, 2014 19:07:00

Kerrin
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Double-decade Performance


The drop to 80% system efficency is due to “overgrown trees debris build up”.


Kerrin





Edited Kerrin (Sept. 23, 2014 19:07:00)

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#7 Sept. 23, 2014 20:15:00

bhommels
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Double-decade Performance


Depending on which article you read, it says very different things. The rehash of the windandsun article by solarpowerportal is very sloppy indeed.








Edited bhommels (Sept. 23, 2014 20:15:00)

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#8 Sept. 24, 2014 10:12:00

Capetown
From: The Banks Of The River Mole
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Double-decade Performance


That's correct Steve Rogers, I should have said “Also the inverter lasted at least 14 years!”







The gene pool has no lifeguard!

Edited Capetown (Sept. 24, 2014 10:12:00)

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