Result
conditions, it is evident that the financial metrics of an investment in each scenario are not vastly different. In the higher than expected irradiation scenario, (i.e. the P1), the payback period for a typical 500kW 13.38% while in a worst case scenario, (i.e. the P99), the corresponding numbers would be 9.67 years and 11.30%. However the more pertinent numbers to analyze are the P10 and P90 scenarios, which demonstrate
that it is highly likely that over the lifetime of a system in Singapore, the output of a similar solar installation would return an 8.8 to 9.5 year payback period with an IRR of 11.57 to 12.79%. This difference of only 6 months and 1.22% in IRR is typical of a low risk investment.