Solar Panel Installation in Coimbatore Guide

No script

Coimbatore gets strong sunshine for most of the year, and many families here now look at rooftop solar to cut their electricity bills. The technology is mature, but the results depend on choosing the right size, a careful installer and the correct paperwork. This guide explains the choices and the checks, in plain words.

How Rooftop Solar Works at Home

Solar panels on your roof produce DC electricity in daylight. An inverter converts it to the AC power your home uses. What you do not use at that moment flows out to the grid through a bi-directional (net) meter, and the exported units are set off against the units you draw from the grid at night.

There are three common types of system:

Type	How it works	Good for
On-grid	Connected to the grid, no batteries; exports extra power	Lowest cost per unit; eligible for the national subsidy and net metering
Off-grid	Runs on batteries, not connected to the grid	Farms or places with no reliable supply
Hybrid	On-grid plus batteries for backup	Homes that want power during cuts

A plain on-grid system shuts down during a power cut. That is a safety rule to protect line workers, not a fault.

The PM Surya Ghar Subsidy

The central government scheme PM Surya Ghar: Muft Bijli Yojana supports rooftop solar for homes. As of September 2026, the central subsidy for residential systems is:

• Rs 30,000 per kW for the first 2 kW,
• Rs 18,000 for the third kW,
• a maximum of Rs 78,000 for systems of 3 kW or more.

The subsidy is paid into the homeowner's bank account after the system is installed, inspected and commissioned. To claim it, you apply on the national portal (pmsuryaghar.gov.in) and use a vendor registered for the scheme. Scheme rules and amounts can change, so check the portal for the current terms before you sign anything, and do not rely only on a salesperson's figures.

Net Metering in Tamil Nadu

In July 2024 TANGEDCO was split into separate companies, and electricity distribution in Tamil Nadu is now handled by the Tamil Nadu Power Distribution Corporation Limited (TNPDCL). For an on-grid rooftop system, the distribution company processes the connection, inspects the installation and fits the net meter. Your vendor usually handles the paperwork, but the application is in your name, so keep copies of everything.

Sizing Your System

1. Collect your electricity bills for the past year. Tamil Nadu bills domestic users every two months, so divide by two for monthly units.
2. Note how much of your usage is during the day (fans, fridge, motor, work-from-home) and at night (AC, lights).
3. Measure the shade-free roof area. Water tanks, neighbouring buildings, trees and the staircase room all cast shadows that reduce output.
4. Ask the vendor to show the expected yearly generation for the proposed size, and how they calculated it.

Many homes find 2 to 3 kW enough, but a large family with ACs may need more. Bigger is not always better: check how exported units are credited under the current Tamil Nadu rules before oversizing.

What to Check in a Vendor

• Registration: for the subsidy, the vendor must be registered on the national portal. Ask for their details and check them.
• Site visit: a proper vendor inspects the roof, checks shading and the strength of the structure before quoting.
• Named components: the quote should name the brand, model and wattage of the panels and the inverter, not just "Tier 1 panels".
• Mounting structure: ask for galvanised or aluminium structure, the height above the roof, and how it is anchored without damaging your waterproofing.
• Earthing and lightning protection: separate earthing for the panels and inverter, and a lightning arrester where needed.
• Warranty in writing: panel performance warranty, product warranty, inverter warranty and installation workmanship - each stated separately, with who you call.
• Monitoring: most inverters have an app or display; ask to be shown how to read daily generation.

Get at least two written quotes and compare them item by item.

Roof and Safety Points

• If your terrace has leak problems, fix them before the panels go on. Removing panels later to waterproof the roof costs time and money.
• Leave a walkway to clean the panels and reach the water tank.
• Wiring should run in proper conduits, with DC and AC isolators near the inverter.
• A qualified electrician should check that your home wiring and earthing are in good condition. Our guide on finding reliable electricians in Coimbatore lists what to ask.

Looking After the System

Dust is the main enemy of solar output in Coimbatore, especially in the dry months and near busy roads or construction. Rinse the panels with plain water early in the morning or in the evening, when they are cool, and avoid harsh brushes or detergent. Check the daily generation on the inverter app; a sudden drop usually means dirt, shade or a fault. Keep the inverter in a shaded, ventilated place.

Solar and Your Other Appliances

Solar works best when paired with efficient appliances. A well-serviced AC uses less power; see our guide on choosing AC service in Coimbatore. If you mainly want backup during power cuts rather than bill savings, a hybrid system or a home inverter may suit you better.

Next Steps

Gather a year of electricity bills, check the current scheme details on pmsuryaghar.gov.in, and invite two registered vendors for a site visit. Compare their written quotes line by line - components, structure, earthing, warranty and who handles the TNPDCL paperwork. You can also find solar installers listed in the Kovai Yellow Pages directory.

---

Frequently Asked Questions (FAQ)

Similar Posts : How to Choose AC Service in Coimbatore, Arulmigu Patteeswarar Swamy Temple A Sacred Abode, Water Tank Cleaning in Coimbatore What to Check, Mosquito Net and Window Mesh Installation in Coimbatore, Solar Water Heater Buying Guide for Coimbatore Homes,

See Also:solar rooftop solar coimbatore kovai electricity hiring guide