Table 9 Comparison between of a stand-alone and grid-connected proposed PV system

Total yearly cost including inflation

$1009.37USD /year

$145.89USD /year

Produced energy

2999kWh/year

5.9 MWh/year

Payback period

Indefinite

8.7 years

Net profit at the end of the lifetime

–

$1992.2USD

Return of investment (ROI)

–

86.60%

Used energy cost

0.345USD /kWh

0.060USD/kWh

CO₂ emissions saved

5.0 tons

10.3 tons