Commercial

A 20 kWp Solar PV system on a south facing roof (or ground mounted), in Northern Ireland, will produce approximately 16,900 kW/hours of electricity per annum. If 50% of the energy produced was used on site the financial returns would be as follows:

System Size

20 kWp

Quantity of modules & output

80 modules (roof area required 140m²)

Annual electricity yield

16,900 kWh/annum

Annual ROC payment

£2,866.25

Electricity saved (assuming 0.15p/kWh)

£1,267.50

Electricity exported to the grid

£502.77

Total annual benefit - income and savings

£4,636.52

Payback period

5.8 years (ROI 12%)

 

A 50 kWp Solar PV system on a south facing roof (or ground mounted), in Northern Ireland, will produce approximately 42,250 kW/hours of electricity per annum. If 50% of the energy produced was used on site the financial returns would be as follows:

System Size

50 kWp

Quantity of modules & output

200 modules (roof area required 350m²)

Annual electricity yield

42,250 kWh/annum

Annual ROC payment

£7,165.60

Electricity saved (assuming 0.15p/kWh)

£3,168.75

Electricity exported to the grid

£1,256.93

Total annual benefit - income and savings

£11,591.28

Payback period 

4.8 years (ROI 16%)

These figures do not allow for the expected increase in electricity prices and value of the ROC over the period which may decrease the payback time and increase the return on investment.