Honest math
Every number sourced and dated. DISCOM tariff slabs, MNRE benchmarks, central subsidy structure — all linked.
Cut your bills. Become independent — for energy and water.
Solar and rainwater estimates from your address and bill. Government subsidies* included. No salesperson. No signup.
₹62,483
government subsidies* you qualify for
₹30k + ₹30k + ₹18k tiers (≥3 kW system)
3.0 years
typical payback, 2 BHK house
Independent rooftop · ₹2,000/mo bill · Karnataka
₹7.7 lakh
saved over 25 years
Lifetime bill savings, modeled on the same sample profile
Sample: 2 BHK independent home, Karnataka, ₹2,000/mo bill (~2.14 kW). Indicative, not a quote. On an apartment flat? Read why the roof matters.
How it works
- 1Tell us about your home
Address (we don't store it), state, monthly bill. 30 seconds.
- 2See your savings
System size, potential subsidy, EMI options, 25-year projection.
- 3Compare and pick a partner
Installers ranked for your state and system size. You decide.
AI-native
Do it all through your AI assistant
Ask Claude, ChatGPT, Gemini — or any agent — to run an estimate, compare installers, and book a consultation for you. Same transparent, objectively-ranked results. No salesperson in the loop.
Discover & book by chat
Over our MCP server, public API, or CLI.
Subsidy, pre-checked
See the government subsidy you'd qualify for, by tier.
Recommended, with reasons
Ranked on signals, never paid placement.
What you get
Government subsidies*
Up to ₹78,000, auto-applied by tier.
Payback + 25-year projection
With degradation and tariff inflation. Sourced and dated.
EMI options
PSU-bank concessional rates. Adjust tenure to see break-even.
Installer comparison
MNRE-empanelled, ranked by price, warranty, and rating.
Satellite roof scan
We size against your actual rooftop, not just your bill.
We take you all the way — not just to an estimate
Compare, apply for your subsidy, and get installed — one guided journey for solar and rainwater, home or business.
See how the guided journey worksWhy RainbowHome
No sales pressure
The calculator runs without an account. You only share contact details if you ask for a quote, and consent is never pre-ticked.
One view, all options
Compare every government-scheme-aligned installer and loan in one place. No juggling five quote calls.
* Government subsidies can change. Review the latest regulations on the official government portal before committing to a rooftop solar installation.
The scheme is actively funded. PIB reports ₹9,281 crore disbursed across ~57.9 lakh applications as of 2025-07 (source ). Last verified 2026-05-20.
FAQ
Is this free?
Yes. The estimate is free and works without an account or signup. We only ask for contact details if you choose to request a free site survey or quote.
Do you sell my data?
No. If you ask for a site survey we share your phone, name, and (optional) email with one or more certified installer partners — only for that purpose, and only after you tick the consent checkbox.
How accurate is this?
Numbers are derived from your DISCOM's published tariff slabs, the MNRE benchmark cost, and the central government's rooftop-solar subsidy structure. Final pricing always depends on a site survey.
What government subsidies do I qualify for?
Indian homeowners can claim up to ₹78,000 from the central government's rooftop-solar scheme on a 3 kW system (tiered ₹30,000 + ₹30,000 + ₹18,000 across the first 3 kW). Subsidy amounts can change — verify on the official portal before installing.
Which states do you support?
Karnataka, Maharashtra, Tamil Nadu, Kerala, and Andhra Pradesh today. More states are coming based on waitlist demand.
How do you pick the installers?
We list every MNRE-empanelled installer in your DISCOM area. We don't rank by who pays us — we rank by price-per-kW, MNRE empanelment, warranty terms, and post-install service rating.
What does RainbowHome earn?
When you choose an installer, we get paid a one-time referral fee. The estimate is and always will be free. You pay zero extra over a direct quote — partners commit to passing through the same pricing.
Need rainwater harvesting too? Compare RWH installers →