Meet Ram and Krishnan. Same city, same ₹1.2 lakh to invest, same 30-year period. What they chose to do with it tells you everything about why solar is a financial decision, not just an environmental one.
Ram’s path: a plain fixed-return investment
Ram invests ₹1.2 lakh once, in an instrument returning 6.5% a year, and simply lets it grow, untouched, for 30 years.
Krishnan’s path: the same ₹1.2 lakh, on his roof
What’s not counted here — on purpose
To keep this comparison honest, two things roughly cancel out and are left out of the numbers above:
- The 100 free bi-monthly units under the government scheme aren’t factored in — that’s additional upside Krishnan gets that isn’t reflected in the ₹18.83 lakh figure.
- Against that, Krishnan will likely need to replace his solar inverter once within 30 years — a real cost that isn’t subtracted either.
These two roughly offset each other, which is why they’re left out rather than estimated — the 2.37× figure is a fair, conservative comparison, not a best-case one.
Why choose Thannirai Tech Systems?
Krishnan’s numbers only work if the system is sized correctly in the first place. That’s the entire reason Thannirai Tech Systems exists.
Engineering-first, not sales-first
We don’t oversize your system. We don’t recommend equipment or capacity you don’t need just to increase the invoice. We are not a sales-target-driven company — we are an engineering and passion-driven one.
We come to your home, sit with you, and actually understand your household’s electricity usage — today, and what it’s likely to become. If you’re planning an EV, a new AC, or an extra floor in the next few years, that shapes the system we design for you now, so you’re not undersized in year 3 or overpaying in year 1.
PM Surya Ghar closes 31 March 2027 — or once 1 crore homes are installed nationally, whichever comes first
The PM Surya Ghar Muft Bijli Yojana currently offers up to ₹78,000 in central subsidy for a 3kW+ residential system. Applications are accelerating nationally as the scheme approaches its target, and there’s no guarantee the subsidy structure continues once the scheme closes — whether by the March 2027 deadline or by reaching its 1 crore installation target sooner. If you’re in Tamil Nadu — Coimbatore, Tiruchirapalli, Chennai, Madurai, or anywhere in between — this is the window to lock in the subsidy before it’s gone.
Talk to an engineer, not a salesperson
Be smart. Be wise. Choose Thannirai Tech Systems.
Contact us for a free site visit — we’ll size your rooftop solar system around your actual home, your actual usage, and the PM Surya Ghar subsidy you’re entitled to under Tamil Nadu’s current tariff structure, before the scheme’s window closes.