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Silicon PowerSystems

Estimate, not a guarantee

Solar ROI calculator

See how a solar investment could pay back over time. All formulas and assumptions are shown; enter only incentives you have verified.

System & costs

Use a real quotation figure.

Only amounts you have verified. Default 0.

From the solar calculator or simulator.

Tariffs & usage

Share used on site; the rest is exported.

Net-metering/feed-in rate, check your DISCOM.

Financing & analysis

Default 0.716 (CEA CO₂ Baseline Database v19.0, FY 2022-23).

Financial estimate

Estimate, not a guarantee

Upfront payment

₹3,00,000

Year-1 savings

₹44,640

Simple payback

6.8 years

Discounted payback

9.9 years

NPV

₹2,27,629

at 8%

IRR

15.2%

Lifetime ROI

344.4%

Lifetime net benefit

₹10,33,149

CO₂ avoided

121.4 t

1,69,603 kWh × 0.716

Cumulative cash position by year (₹)
-5L1.3L7.5L13.8L20LY1Y3Y5Y7Y9Y11Y13Y15Y17Y19Y21Y23Y25

Orange = still below break-even; blue = cumulative gain. “L” = lakh.

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Year-by-year cash flows
YearkWhSavingsO&MLoanNetCumulative
0-₹3,00,000-₹3,00,000
17,200₹44,640₹3,000₹0₹41,640-₹2,58,360
27,164₹45,620₹3,150₹0₹42,470-₹2,15,890
37,128₹46,626₹3,308₹0₹43,318-₹1,72,571
47,093₹47,657₹3,473₹0₹44,184-₹1,28,388
57,057₹48,714₹3,647₹0₹45,067-₹83,320
67,022₹49,798₹3,829₹0₹45,969-₹37,351
76,987₹50,910₹4,020₹0₹46,890₹9,539
86,952₹52,050₹4,221₹0₹47,828₹57,367
96,917₹53,219₹4,432₹0₹48,786₹1,06,153
106,882₹54,417₹4,654₹0₹49,763₹1,55,917
116,848₹55,646₹4,887₹0₹50,760₹2,06,676
126,814₹56,906₹5,131₹0₹51,775₹2,58,452
136,780₹58,199₹5,388₹0₹52,811₹3,11,263
146,746₹59,523₹5,657₹0₹53,866₹3,65,129
156,712₹60,882₹5,940₹0₹54,942₹4,20,071
166,678₹62,274₹6,237₹0₹56,038₹4,76,109
176,645₹63,702₹6,549₹0₹57,154₹5,33,263
186,612₹65,166₹6,876₹0₹58,290₹5,91,553
196,579₹66,667₹7,220₹0₹59,447₹6,51,000
206,546₹68,206₹7,581₹0₹60,625₹7,11,626
216,513₹69,784₹7,960₹0₹61,824₹7,73,449
226,481₹71,401₹8,358₹0₹63,043₹8,36,493
236,448₹73,060₹8,776₹0₹64,284₹9,00,777
246,416₹74,760₹9,215₹0₹65,545₹9,66,322
256,384₹76,502₹9,675₹0₹66,827₹10,33,149

Formulas

Year t generation = G₁ × (1 − d)t−1. Savings = generation × self-use × tariff × (1 + e)t−1 + generation × (1 − self-use) × export tariff. Net = savings − O&M × (1 + eO&M)t−1 − loan payment. NPV discounts net flows at your rate; IRR is the rate where NPV = 0 (shown as “Not defined” when no such rate exists). Payback is the first point where cumulative cash turns non-negative.

Estimate, not a guarantee, offer or financial advice. Results depend entirely on the inputs you enter. Tariffs, escalation, export rates, net-metering rules and incentives change and vary by DISCOM, verify them before deciding. No subsidy is assumed unless you enter one.