The system’s life-cycle cost is calculated by factoring in things like tax benefits, interest rates, subsidies, and inflation rates. With a projected 30 year expected life, the distillate produced from a modified double-basin solar still costs 61 paisa per liter. A cost payback time of 125 and 235 days obtained, respectively, with double and single-basin solar still coupled with vacuum tubes. An energy payback period of 1.13 and 1.94 years, respectively, were found for the single and double-basin solar still. A carbon credit ranging from 3864 to 26,460 ₹ and 7980 to 51,240 ₹, respectively, with single and double-basin solar still over a 5–30 years lifespan, with a 5 year step. CO2 mitigation costs $2.4 per ton. The amount of CO2 mitigated varies depending on 40 tons to 254 and tons 19 tons to 131 tons, respectively, for single- and double-basin solar stills.