3.9kW South facing System

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A 3.9kW System could generate an estimated 3348 kWh of electricity per annum. Estimated annual savings and earnings could be:

• £703.03    Income from "Feed In Tariff" (3348 * 21p)
• £152.32    Saving on electricity bill (3348 * 13p * 35%)
• £  51.89    Income from electricity exported (3348 * 3.1p * 50%)
• £907.24    Total

Assumptions:

• South facing roof has 30 degrees slope
• No (or very little shade) hitting roof
• 35% of electricity generated is used in the home
  (some Companies use 50%)
• 50% of electricity generated is sold to back electricity provider
  (50% is default value unless a smart meter is used)

Predicted System Performance

The performance of Solar PV systems is impossible to predict with certainty due to the variability in the amount of solar radiation (sunlight) from location to location and from year to year. However, it is possible to estimate the performance of a solar PV system and the UK Microgeneration Scheme requires all certified companies to also give an assessment of system performance using a standardised approach based on the Government’s Standard Assessment Procedure (SAP) 2009.