Techno-economic and environmental evaluation of the performance of a solar water pumping system in arid and desert climates

Table 12 Sensitivity analysis of economic indicators to pump and inverter lifespan and replacement costs (17° Tilt angle).

Scenario	Payback period (years)	NPV ($)	Return on investment (ROI) (%)
Base case	16.7	13,262	12.5
Pessimistic	18.9	− 2150	10.3
Optimistic	14.5	28,500	14.8