Financing rooftop solar for an Indian home — a neutral guide to EMI, loans and subsidy^* timing

What a rooftop solar system typically costs

Your loan size follows from the system size, so start there. As a rough band, most residential rooftop systems in India land between ₹55 and ₹85 per watt installed, and roughly 100 sq ft of shade-free roof supports about 1 kWp. A typical 3 kW home system therefore sits in a wide range rather than at one precise number — which is exactly why you should price your own roof before borrowing.

For the underlying numbers, see our installed price-per-watt benchmark and our system-size guide. Use ranges, not a single quoted figure, when you plan the financing.

The main ways to pay

There are four common routes. Most homeowners combine the first with one of the others.

• Full upfront (own savings). No interest, fastest payback, and no lender paperwork. The trade-off is a large one-time outlay while the subsidy^* reimbursement still arrives only after commissioning.
• Collateral-free personal / consumer loan. No property security needed and quick to arrange, but unsecured loans usually carry the highest interest rate of these routes. Good when you want to preserve savings and repay quickly.
• Home-improvement top-up on an existing home loan. If you already have a home loan, a top-up is secured against the property, so the rate is typically the lowest of these routes and the tenure can be long. Availability depends on your outstanding loan and property valuation.
• Bank rooftop-solar schemes. Several banks run dedicated rooftop-solar loan products under RBI priority-sector lending, sometimes at more favourable terms than an unsecured personal loan. Terms, rate and empanelled-vendor conditions differ by bank and branch. Last verified: July 2026.

We don't recommend a specific lender or product — compare the effective annualised rate, tenure and processing fees across at least two options. Browse listed financing routes and installers in our installer & financing directory.

How the subsidy^* interacts with a loan

The potential government subsidy^* for residential rooftop solar is tiered by system size and capped. As published in 2026, the indicative central slabs are roughly ₹30,000 per kW for the first 2 kW plus ₹18,000 for the 3rd kW, with the total capped at about ₹78,000 for any system of 3 kW or more. These are indicative figures that are revised periodically — never a guaranteed amount.

The timing is the part that matters for financing: the subsidy is disbursed to your bank account after installation and inspection via the national portal, not deducted from the price upfront. So you typically finance the gross cost and receive the subsidy as a later reimbursement. Plan cash flow for that gap — and when the reimbursement lands, many homeowners use it to prepay part of the loan, cutting the remaining interest.

Confirm the current slabs and process on the official government subsidy portal (pmsuryaghar.gov.in). Last verified: July 2026. For the full application flow, see our step-by-step subsidy guide.

How EMI compares to your electricity bill

The intuition behind financing solar is that the monthly saving on your electricity bill offsets part — sometimes most — of the EMI, so your net monthly cash outflow barely changes while you build an asset. Whether it fully covers the EMI depends on your tariff, system size, tenure and interest rate, so treat this as a range to check against your own numbers.

• Karnataka (BESCOM). Domestic LT-1 is a broadly flat rate of about ₹5.80/kWh on every unit (KERC combined tariff order, single slab since 1 Apr 2025), plus a small per-unit levy in force since 1 Apr 2025 that lifts the effective rate a little higher (roughly ₹6.15/kWh). Every unit your roof generates and you self-consume saves close to that rate, which makes the saving easy to estimate. KERC order. Last verified: July 2026.
• Tamil Nadu (TNPDCL, formerly TANGEDCO). Domestic tariffs are telescopic — the rate rises with consumption — so high-usage homes save more per financed rupee than low-usage homes. Because the top slabs are dearer, the EMI-versus-bill math is more favourable for heavy users. TNPDCL. Last verified: July 2026.

Rather than trust an illustrative figure, run your own bill through our savings estimator — it uses your state's tariff and system size to show an indicative monthly saving you can hold up against a candidate EMI.

What lenders look at — and what to ask an installer

Financing is never guaranteed. Lenders assess each application on its own merits, and typically consider:

• Roof and property ownership. Secured products (home-loan top-ups) need you to own the property; a shared or disputed roof complicates things.
• Income and repayment capacity. Income proof, existing obligations and credit history drive both approval and the rate you are offered.
• System and vendor details. Some scheme loans require the installer to be empanelled, mirroring the subsidy^* conditions.

There is no guaranteed approval— an installer promising "100% loan sanctioned" is overstating what any lender will commit to. Useful questions to ask an installer: Which banks or NBFCs do you have tie-ups with? Do those cover the subsidy paperwork and net metering? Is the quote the gross cost before subsidy, and does it separate hardware from financing charges? We rank installers partly on this kind of transparency — see how we rank.

Karnataka vs Tamil Nadu notes

• Karnataka. The near-flat BESCOM rate of about ₹5.80/kWh (a little higher once the per-unit levy is included) makes the saving simple to model, so an EMI-versus-bill comparison is straightforward. Karnataka runs net billing (not classic net metering) with surplus export credited at roughly ₹3.86/kWh, so financing decisions should lean on self-consumption savings rather than export income. See net metering in Karnataka.
• Tamil Nadu. Telescopic TNPDCL slabs reward heavier users, so a financed system can look more attractive for a high-consumption home. See net metering in Tamil Nadu and our Chennai cost guide.

In both states the subsidy^* process and timing are the same — a nationally administered reimbursement paid after commissioning.

Frequently asked questions

This page is general information, not personalised financial advice. RainbowHome does not lend and is not a licensed financial adviser — verify current rates, terms and subsidy^* amounts with the lender and the official portal before committing.