Solar Payback Period in India: How Many Years Until Your System Is Free?

A rooftop solar system in Madhya Pradesh or Chhattisgarh pays for itself in about 4–5 years for a home (after the PM Surya Ghar subsidy) and 3–4 years for a business on commercial tariffs — then produces electricity at almost no cost for the remaining 20 years of its life. Here is how to calculate your own number.

The formula

Simple payback = net system cost ÷ annual electricity savings. Net cost is what you pay after the subsidy. Annual savings is the units the system generates in a year multiplied by the tariff those units would have cost you — not the average tariff, but the slab you are actually in, because solar removes the most expensive units first. In MP and CG a well-installed system generates about 1,450–1,550 units per kW per year.

Example 1 — a 3 kW home in Shivpuri or Bilaspur

• Installed price ≈ ₹2,00,000; PM Surya Ghar subsidy ₹78,000; net cost ≈ ₹1,22,000
• Generation ≈ 4,500 units a year
• Upper domestic slab with charges ≈ ₹6–7 per unit → savings ≈ ₹27,000–31,000 a year
• Payback ≈ 4–4.5 years

After payback the system keeps producing for twenty more years at 0.5 per cent degradation a year, so lifetime savings — allowing for modest tariff growth — land between ₹9 and ₹12 lakh.

Example 2 — a 5 kW home with two ACs in Gwalior

• Installed ≈ ₹3,00,000; subsidy capped at ₹78,000; net ≈ ₹2,22,000
• Generation ≈ 7,500 units a year; summer bills of ₹4,000–5,000 put the home firmly in the top slab
• Savings ≈ ₹50,000–55,000 a year
• Payback ≈ 4–4.5 years — the same as 3 kW, because the subsidy is capped but the tariff saved is higher

Example 3 — a 50 kW rice mill or warehouse

• Installed ≈ ₹22,50,000–25,00,000; no subsidy, but accelerated depreciation on the asset
• Generation ≈ 72,000–75,000 units a year, consumed on site during the working day
• Commercial tariff ≈ ₹8–9 per unit → savings ≈ ₹6–6.5 lakh a year
• Payback ≈ 3.5–4 years before tax benefits; closer to 3 years after

Five things that change the number

1. Which slab you are in. A home paying ₹800 a month is on a cheap slab and saves ₹4–5 a unit; payback stretches to 6–7 years. Solar makes the most sense from about ₹1,500 a month upward.
2. Tariff growth. DISCOM tariffs in MP and CG have risen 3–5 per cent a year. Every increase shortens payback, because the system's cost is fixed on day one.
3. Shade and dust. A shadow across one panel at midday, or a month without cleaning in the dry season, can cut output 10–20 per cent and add a year to payback. The site survey and a cleaning routine protect the number.
4. Panel and inverter quality. Tier-1 DCR modules from Waaree, Adani or Tata degrade about 0.5 per cent a year; cheaper modules can lose twice that, and a failed inverter in year six costs ₹30,000–50,000. Cheap quotes often have longer real paybacks.
5. Self-consumption vs export. Net metering credits exported units against imports, but any annual surplus is paid at a lower DISCOM rate. Size the system to your consumption, not to the roof — Sunvera sizes from your last 12 bills for exactly this reason.

Payback when you finance the system

With a PM Surya Ghar loan — up to ₹2 lakh at concessional interest for systems to 3 kW, available through SBI, HDFC Bank, PNB and Bank of Baroda — a 3 kW system's EMI over seven years is about ₹2,000 a month. If the bill it replaces is ₹2,300, you are ahead from the first month and the ₹78,000 subsidy, when it arrives, can prepay part of the loan. In that case "payback" is not something you wait for; the system simply costs less than the electricity did.

Payback is not the whole story — three other numbers

• Return on investment. ₹27,000 a year on a ₹1,22,000 net cost is a 22 per cent annual return, tax-free, for 25 years. No fixed deposit or debt fund comes close, and the "return" is a bill you no longer pay rather than income you must declare.
• Levelised cost of electricity. Spread ₹1,22,000 plus about ₹20,000 of lifetime cleaning and one inverter replacement over 1,00,000 units generated in 25 years and each solar unit costs roughly ₹1.40 — against ₹6–7 from the DISCOM today and more every year.
• Hedge value. The system locks in the price of 4,500 units a year for a quarter century. Whatever tariffs do, that part of your consumption is fixed on the day the net meter goes in.

Get your own payback number

Send Sunvera Energy your last 12 electricity bills on WhatsApp at +91 77103 07937. The proposal you get back shows the system size, the installed price, the subsidy, the expected annual generation for your district and the payback in years — on one page, so you can compare it with any other quotation on the same basis.

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