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

From: Techno-economic feasibility analysis of a 3-kW PV system installation in Nepal

  Standalone PV system Grid-connected 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