Installation details:
System: 16 x 240w Conergy Plus mono panels + Aurora ‘Power-one’ 3.6 inverter
Roof: 190 degrees, 35 degree tilt, minimal shading.
Financials: Install cost with Aurora Desktop Monitor c. £12k. FiT payment 2011/12 43.3p
Comment from Mr Sypula:
Our annual target kilowatt hours (generation) target of 3,248 is derived by applying the UK standard SAP formula to the peak kilowatt system installed (in our case 3.84 kWp) taking into account roof elevation, direction & shading. Target daily hours are calculated by applying NASA’s 10 year monthly average irradiation measurements taken in London.
Payback, or return of investment (ROI) is based on the financial return targeted or forecast to be produced in the first full year compared to the installation cost. Applying a weighted annual forecast, the data shown in Fig 2 already suggests a significant reduced pay back period, an enhanced tax free return, and a further reduction in our carbon footprint. That said, it remains to be seen whether summer conditions will be as favourable relatively. Watch this space.
Comment from Cernunnos Homes:
SAP estimates treat the UK as a “one degree country” – i.e. Edingburgh is assumed to have the same climate as Devon! SAP is based on a house in Sheffield and any house further South than Sheffield can be expected to outperform the SAP estimates. This can be seen with Mr Sypula’s installation. He has a perfect house and installation and is easily going to beat the expected ROI we gave him based on SAP estimates.
