1.75kW System

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Case Study 1 -­‐ 1.75kW System

Background

This installation is on a semi-­‐detached Edwardian house with a westerly facing roof, 30° pitch. The optimum position for a Solar PV system is on a south facing roof or wall but as you will see from the this example, even a westerly facing roof represents a sound investment.

Solar PV System Specification

  • 10 x BP 4175T Photovoltaic Modules (dimension 4150mmx3200mm)
  • 1 x StecaGrid 2000+ Inverter
  • 1 x OFGEM approved total generation meter
  • Schuco mounting system

Predicted System Performance

  • Output = 1278kWh/year
  • Income and Savings = £700/year*
  • Income & Savings after 25 years £20,147**
  • Cost to install £10,500 (August 2010)
  • Payback time 14 years**
  • Average Annual ROI 7.7%**

*Based on 12p/kWh current energy cost
**Assumes 2% inflation, 3% annual increase in energy costs