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.
Honest rooftop-solar and rainwater-harvesting estimates from your address and bill. Government subsidies* for solar, BWSSB / CMWSSB mandate-ready RWH. No salesperson. No signup.
Solar: KA · MH · TN · KL · AP · Water: KA · TN
₹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 profile: a 2 BHK independent house or villa in Karnataka on a ₹2,000/month electricity bill — which sizes to about a 2.14 kW system (4 panels). These are indicative estimates from that profile, not a quote.
Apartment flats: rooftop solar needs roof rights. In a multi-storey apartment the roof is shared, so an individual flat — whether you're on the 2nd floor or the 24th — usually can't install its own panels; it takes a society-wide system the RWA approves. These numbers assume an independent rooftop. Your actual subsidy, payback, and savings depend on your roof, your DISCOM's tariff, and the installer's price — run the calculator for figures based on your own home.
How it works
- 1Tell us about your home
Address (we don't store it), state, monthly bill. 30 seconds.
- 2See your savings
System size, exact subsidy, EMI options, 25-year projection.
- 3Compare and pick a partner
Installers and financers, ranked for your state and system size. You decide.
AI-native
Do it all through your AI assistant
RainbowHome is built to be driven by AI. Ask Claude, ChatGPT, Gemini — or any agent — to find rooftop-solar and rainwater-harvesting installers, run a savings estimate, match you to the right government-subsidy-aligned loan, check your state's RWH mandate, and book a consultation on your behalf. Your assistant gets back the same transparent, objectively-ranked recommendations you see here — no salesperson in the loop.
Discover & book by chat
Your AI finds installers and books a consultation for you, over our MCP server, public API, or CLI.
The right loan, matched
Agents pull subsidy-aligned EMI options and surface the best fit for your system size and state.
Recommended, with reasons
Every pick comes with the objective reasons behind it — ranked on signals, never paid placement.
What you get
Government subsidies*
Tiered amounts automatically applied: ₹30k + ₹30k + ₹18k, up to ₹78,000 for a 3 kW system.
Payback + 25-year projection
Includes panel degradation and tariff inflation. Every number sourced and dated.
EMI options
PSU-bank concessional rates pre-loaded — adjust tenure to see cashflow break-even.
Side-by-side installer comparison
MNRE-empanelled installers ranked by price, warranty, and rating.
Side-by-side loan comparison
PSU + private bank rates aligned with the government's rooftop-solar scheme.
Satellite roof scan
Where coverage permits, we size against your actual rooftop — not just your bill.
We take you all the way — not just to an estimate
RainbowHome's agentic AI framework walks you through every step: comparing installers, lining up financing, applying for your government subsidy, and getting the system installed and commissioned. The same guided journey covers both rooftop solar and rainwater harvesting — for your home or your business — so you go from “curious” to “installed” without juggling vendors yourself.
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 in v1.2. More states are coming based on waitlist demand.
How do you pick the installers and financers?
We list every MNRE-empanelled installer in your DISCOM area and every bank offering a government-subsidy-aligned solar loan. 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 a partner, we get paid by the installer or lender (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 + loans →