See how much you can save – try our calculator now
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Select the region of the country that you live in.

Select the orientation of the roof.

South facing roofs are the best for solar panels as they receive direct sunlight throughout the day. East and West facing roofs can also be used, but North facing roofs are not recommended.

Select your approximate roof area. As a guideline of the roof size you can select 'small' for a 2 or 3 bedroom terraced house, 'medium' for 3 bedroom detached, 'large' for 4 bedroom detached, and 'extra-large' for a detached house with 5 or more bedrooms.

Roof area No of panels System output (kWp) Indicative capital cost
Small roof 6 (9m²) 1.3 £7,500
Medium roof 10 (16m²) 2.1 £11,000
Large roof 12 (20m²) 2.5 £12,700
Xlarge roof 18 (28m²) 3.8 £17,300

Are there any large trees or buildings nearby causing shade to fall on your roof?

Solar PV panels work much more effectively if there is nothing blocking the sunlight.

If you know how much electricity you use (kWh/year) enter it here. The average for a UK household is 3300 kWh/year.

Note: 1 unit of electricity is the same as 1 kWh.

Annual electricity saving:

£

Annual income from your PV system:

£

Annual total benefit:

£

income guaranteed and indexed linked for 25 years

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Your annual electricity bill has been estimated from the specified electricity use. The following information has been used to calculate the approximate costs and savings:

Generation tariff you will be paid 43.3p/kWh
Export tariff you will be paid 3.1p/kWh
Unit electricity cost you currently pay 13p/kWh

These calculations assume that 50% of the electricity is used in the home, with 50% exported to the national grid.