Rooftop solar cost in Karnataka 2026: 1 kW to 10 kW, after subsidy, and honest payback

What systems cost in 2026 (market ranges)

There is no fixed government price for a home system. The figures below are market ranges published by installers and solar portals in May–July 2026, mostly for Bengaluru. Prices in Mysuru, Mangaluru, Hubballi or Kalaburagi are in the same band, sometimes a little higher for small towns because of transport and site visits.

For comparison, KERC's own benchmark for working out the solar tariff is ₹45,000 per kW for domestic 1–10 kW systems, inclusive of taxes (tariff order of 25 August 2026). Market quotes for small systems are usually higher than that because fixed costs (structure design, earthing, paperwork, the site visit) are spread over fewer panels.

Where the money goes

• Panels (roughly half the price). DCR panels (Indian cells) are required for the subsidy and cost more: KERC noted average module prices in April 2026 of about ₹22.3 per watt for DCR against ₹13.8 per watt for non-DCR (before GST). On a 3 kW system that difference alone is about ₹25,000, which is why non-DCR quotes look cheap but lose the ₹78,000.
• Inverter (about 15–20%). A string on-grid inverter is cheapest. A hybrid inverter with batteries costs much more and is only worth it if you have frequent power cuts.
• Mounting structure. Hot-dip galvanised steel or aluminium costs more than painted mild steel, but painted MS rusts within a few monsoons, especially in coastal Dakshina Kannada and Udupi.
• Balance of system. DC and AC cables, DC isolator, surge protection, AC MCB, earthing pits and a lightning arrester. This is where cheap quotes cut corners.
• ESCOM costs. The smart meter(s) are at your cost. Non-subsidy applicants also pay a registration and facilitation fee (₹1,500 plus GST for 1–5 kW under the BESCOM SOP); this is waived under PM Surya Ghar. If your sanctioned load must be raised, you pay load enhancement charges and extra security deposit.
• Labour, transport, net metering paperwork and, with good vendors, a few years of cleaning and maintenance.

Worked example: comparing two quotes for the same 3 kW

A family gets two quotes for a 3 kW subsidised system. Quote A is about ₹30,000 cheaper. On paper both say "3 kW on-grid, DCR panels, net metering included". Laid side by side, the gap looks different:

Quote A has not lied. It has left out the items that cost money later: a structure that rusts in a few monsoons, earthing that fails the inspection or the first lightning season, a meter you will pay for anyway, and no one to call when output drops. Ask the cheaper vendor to quote the same scope as the other one. Often the gap closes, and sometimes it reverses.

Three questions settle most comparisons: who is doing the AC wiring and earthing (it should be a licensed electrical contractor), what lightning protection is included (see our lightning protection guide), and whether the vendor is registered on the national portal for your ESCOM. If the vendor cannot answer the third one, the subsidy is at risk whatever the price.

How much a system generates in Karnataka

KERC uses a capacity utilisation factor of 19% for all solar tariff calculations. That works out to about 1,660 units per kW per year, or 4.5 units per kW per day on average. Real rooftops with some dust, heat and partial shade usually do a little less. Installers in Bengaluru report around 7,000–8,000 units a year from a 5 kW system, which is 3.8–4.4 units per kW per day.

• Use 4 units per kW per day (about 120 units a month) for planning. That is safe across most of the state.
• Generation is highest from February to May and drops in the monsoon months, sharply on the coast and in the Malnad districts where June to September is heavily overcast.
• A water tank or a neighbour's taller building shading even part of a panel string can cut output far more than you expect.

Payback with the ₹5.80 tariff: two real-world cases

Each unit your solar offsets saves the ₹5.80 energy charge plus the per-unit surcharge and the 9% electricity tax on it, roughly ₹6.5 a unit in 2026-27. Each unit exported beyond your monthly use earns only the solar tariff: ₹1.96–₹2.58 with the PM Surya Ghar subsidy, ₹3.89 without (see our net metering guide).

These are worked examples using the 2026-27 tariff and the market ranges above, not promises. Your own result depends on your bill and roof.

Solar does make sense if you regularly cross 200 units, plan an EV charger, ACs or induction cooking, or your connection is not eligible for Gruha Jyothi (for example a second house or a home office on a commercial tariff). Use our tariff and bill calculator to see what you actually pay today.

Sizing: start from the bill, not the roof

1. Add up the units on your last 12 bills and divide by 12.
2. Divide the monthly average by 120 to get the kW. A home using 360 units a month needs about 3 kW.
3. Check the roof: about 80–100 sq ft of shadow-free area per kW.
4. Check your sanctioned load. Up to 10 kW, the ESCOM will enhance it to match the solar, but you pay the charges.
5. Do not oversize to "sell" power. At ₹2–₹3.89 a unit, exporting is the least valuable thing your panels do.

Batteries, backup and running costs

A standard on-grid system switches off during a power cut. That is a safety rule: the inverter must not feed a line that linemen think is dead. Many buyers only discover this after the first outage. If backup matters to you, you have three choices:

• Keep your existing UPS/inverter for lights and fans, and let the solar system run separately. This is the cheapest option and works for most towns with short outages.
• Hybrid inverter with batteries. KERC's 2026 regulations allow hybrid grid-tied inverters with batteries at the consumer's option. Batteries add substantially to the cost and need replacement within the life of the panels, so they rarely pay for themselves on savings alone. Buy them for reliability, not for payback.
• Generator sites (farmhouses, small factories) need a zero-export controller so solar never back-feeds the generator, and CEIG safety approval before commissioning.

Running costs. KERC assumes operation and maintenance at 1% of capital cost a year (₹450 per kW for domestic systems in its 2026 calculation), rising about 5.7% a year. In practice that means panel cleaning every few weeks in the dry season, an annual check of earthing and connections, and an inverter that may need repair or replacement once during the panels' 25-year life. Budget for it.

Red flags in a quote: no panel or inverter brand named, "subsidy deducted" from the price without a written guarantee, an inverter bigger than your sanctioned load, a single earth pit for everything, or a vendor who is not on the national portal's list for your ESCOM.

Questions

Sources

Rules and figures in this article were checked against these sources on 30 Sep 2026. Schemes and tariffs change, so confirm with the official office before you act.

• KERC DSPV tariff order dated 25.08.2026 (capital cost, CUF, module prices, GST)
• KERC Tariff Order 2025 schedules (LT-1 tariff, SRTPV rebate), HRECS copy
• Bridgeway Power: Solar panel price in Bangalore 2026
• Eltron Energy: 5 kW solar cost in Bangalore 2026
• SolarSquare: Solar subsidy in Karnataka 2026 (Bengaluru cost examples)
• BESCOM common SOP for DSPV plants, 01.12.2025 (fees, smart meters)
• Mercom: Karnataka's free electricity programme slows rooftop solar
• Saur Energy: Top 5 underperforming states under PMSGMBY (Jan 2026)
• MNRE PM Surya Ghar CFA structure

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