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Solar Panels Case Study

Mr Smith spends £600 per year on electricity and pays 14p per unit. (Based on average cost of electricity per kWh from ukpower)
He has had a 4kW PV system installed, as follows:

  • 14 295w Panels
  • Standard String Inverter
  • Pitch of roof: 35 Degrees
  • Orientation of roof: Due South
  • No shading on the roof where the panels will be installed

Estimated System Performance

Feed In Tariff

3969 kWh at 3.93 pence = £156

3936kW is how many units his system should produce in a year, and the Feed In Tariff rate is currently 3.93 pence for every kW of renewable electricity produced.

Energy Exported

1984 kWh at 5.24 pence = £104

The exported energy is a deemed figure- it is not metered. This is worked out at 50% of the energy he has have produced, and the export tariff is paid at 5.24 pence per unit.

Energy Used

992.25 kWh at 14 pence = £138.92

In this instance, our customer is not at home all day and is therefore only able to use 25% of the energy his system produces.

He will, therefore, save £139 per year by not having to buy these 992 units from his electricity provider.

The Energy Saving Trust gives some examples of savings here – although we would also advise customers to set washing machines etc on a timer, to utilise the solar electricity, even if you are not at home.

Total Combined Savings & Earnings & Return on Investment

The total amount of saving & earnings made annually is £398.92, and the system cost him £6,119.40. This means he will get an annual return on investment of 6.52%.

Greenscape Energy - Renewable Energy Company Based In Ipswich, Suffolk
Solar Panel and Heat Pump Installers