Commercial Solar Payback — Tamil Nadu
Payback and 25-year ROI for a C&I solar investment in Tamil Nadu, with self-consumption share and export rates.
For a business in Tamil Nadu, solar competes with the commercial grid tariff — and usually wins. Commercial plants self-consume 80–95% of production (daytime load), so the retail rate, not the export rate, drives the result. Tamil Nadu's low latitude (8–13°N) means flat panel tilts and a strong December–May season; TANGEDCO net-feed-in rules differ from net-metering states. Indian C&I buyers should also weigh accelerated depreciation (40%) which this simple-payback view doesn't include.
Payback = net cost ₹4,125,000 ÷ yearly savings ₹1,289,106 = 3.2 years. Tariff inflation shortens it; loan interest lengthens it.
Indicative estimates only, not financial or investment advice. Tariffs, subsidies and net-metering rules change — verify with your DISCOM, utility or installer before committing.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Use the free Commercial Solar Payback — Tamil Nadu online — Payback and 25-year ROI for a C&I solar investment in Tamil Nadu, with self-consumption share and export rates. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About Commercial Solar Payback — Tamil Nadu
For a business in Tamil Nadu, solar competes with the commercial grid tariff — and usually wins. Commercial plants self-consume 80–95% of production (daytime load), so the retail rate, not the export rate, drives the result. Tamil Nadu's low latitude (8–13°N) means flat panel tilts and a strong December–May season; TANGEDCO net-feed-in rules differ from net-metering states. Indian C&I buyers should also weigh accelerated depreciation (40%) which this simple-payback view doesn't include.
How to use Commercial Solar Payback — Tamil Nadu
- 1Enter system size and the local installed cost (defaults reflect the market segment).
- 2Set your tariff, expected self-consumption share and export/feed-in rate.
- 3Apply any subsidy or credit, then read simple payback and the 25-year ROI.
Why use Commercial Solar Payback — Tamil Nadu?
- ✓Splits production into self-consumed (retail-priced) and exported (feed-in-priced) energy — the honest way
- ✓Local subsidy/incentive fields with current scheme defaults where they exist
- ✓Includes a 1%/yr O&M reserve and 25-year degradation so the ROI isn't a brochure number
- ✓Payback, year-one savings and 25-year ROI in one screen
Frequently asked questions
What payback period is realistic for solar?+
With current equipment prices: 3–6 years for most Indian homes (faster with subsidies and high tariffs), 3–5 years for commercial systems with high self-consumption, 6–12 years in low-tariff or low-sun markets. Anything under 8 years implies a 12%+ tax-free return — far better than most fixed-income options.
Why does self-consumption share matter so much?+
Energy you use directly offsets the full retail tariff; energy you export usually earns much less (feed-in or APPC rates). A system self-consuming 80% can pay back twice as fast as the identical system exporting 80%. Size to your daytime load, not to your roof area.
Does the Commercial Solar Payback — Tamil Nadu include maintenance costs?+
Yes — it reserves 1% of system cost per year, covering cleaning, an inverter replacement around year 10–12, and minor repairs. It also derates lifetime ROI for 0.5%/yr panel degradation, which most simple calculators ignore.
Should I wait for panel prices to fall further?+
Waiting costs the savings you'd have earned meanwhile. If payback is under 6 years, each year of waiting forfeits roughly 15–20% of system cost in unrealized savings — almost always more than any further price decline. The math favors installing once the roof and paperwork are ready.
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