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System sizes - The C21e Clay Solar Roof

Ofgem estimates that a typical UK home will consume approximately 3,300 units or kWh per year. This means that a 1.87 kWp Sandtoft solar roof could provide enough electricity to meet around half a typical household's requirements each year.

 

C21e quantity
Roof coverage
(at 90mm headlap)
kWp(1)
kWh/year(2)
Co² saving per year
(kg) (3)
% typical home's electricity requirements per year (4)
18
7.9
0.94
796
452
24%
24
10.5
1.25
1061
603
32%
36
15.8
1.87
1591
904
48%
48
21.1
2.50
2122
1205
64%
60
26.3
3.12
2652
1506
80%
72
31.6
3.74
3182
1808
96%
 
 
(1) Measured under Standard Test Conditions of 1000W/m²  irradiance, AM 1.5 spectrum, 25°C cell temperature.
 
(2) For south facing roof, generating 850 units (kilowatt/hours - KWh) per kWp. Actual performance may vary. See www.Solarcentury.co.uk/performance
 
(3) Using the SAP calculation method for grid displaced electricity - 0.568kg per kilowatt hour.
 
(4) Based on a typical electricity consumption of 3,300kWh/ per annum in the UK. Source www.ofgem.gov.uk