Typical Domestic Systems

Note: All ratings calculated with SAP 2009 at optimum angle and orientation

3KWp Pv System (south facing roof)

Key Features

Fully installed 3KWp system from £5995 inc 5% VAT.

This system will produce approximately 2577 KW hours per year.

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Payback Facts

NIROC payment/year: £439
Electricity saved assuming 0.16p per/unit £206
Electricity exported back to grid at 50%: £70
Total Annual Income/year: £715
Payback: 7 years
ROI: 11.9%
20 year income & savings (3%inflation rate): £18,098

4KWp Pv System (south facing roof)

Key Features

Fully installed 4KWp system from £6995 inc 5% VAT.

This system will produce approximately 3434 KW hours per year.

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Payback Facts

NIROC payment/year: £586
Electricity saved assuming 0.16p per/unit £274
Electricity exported back to grid at 50%: £93
Total Annual Income/year: £953
Payback: 6 years
ROI: 13.6%
20 year income & savings (3%inflation rate): £24,131

4KWp Pv System (east/west facing roof)

Key Features

Fully installed 4KWp E/W system from £6995 inc 5% VAT.

This system will produce approximately 2921 KW hours per year.

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Payback Facts

NIROC payment/year: £498
Electricity saved assuming 0.16p per/unit £234
Electricity exported back to grid at 50%: £78
Total Annual Income/year: £810
Payback: 7 years
ROI: 11.6%
20 year income & savings (3%inflation rate): £20,533

6.5KWp Pv System (south facing roof)

Key Features

Fully installed 6.5KWp system from £9499 inc 5% VAT.

This system will produce approximately 5580 KW hours per year.

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Payback Facts

NIROC payment/year: £952
Electricity saved assuming 0.16p per/unit £446
Electricity exported back to grid at 50%: £150
Total Annual Income/year: £1548
Payback: 5 years
ROI: 16.3%
20 year income & savings (3%inflation rate): £39.213