Carport Solar for Factory and Office Parking: Structure, Cost Premium and Payback

Carport solar puts the solar array on a steel canopy over car parking, so it generates power and shades vehicles without using the building roof. It costs more per kW than roof-mounted solar because you also pay for columns, beams, foundations and drainage. It makes sense where the roof is weak or full, where shade and EV charging have value, or where the canopy meets a real parking need.

What a solar carport is, and what the Government says

The Ministry of Power's Guidelines for Installation and Operation of Electric Vehicle Charging Infrastructure, 2024 define a solar carport as a dual-purpose, stand-alone structure that shelters vehicles while generating renewable energy for use on site, including EV charging. They add that carports can be installed independently or integrated with the grid, and that a carport with battery storage can store solar energy for later charging. The text is in the guidelines issued on 17 September 2024, which also state that charging stations may integrate solar energy.

For a factory or office the guidelines matter in two ways. Captive charging stations, which they define as exclusive facilities for EVs owned or controlled by the station's owner (corporate fleets are an example), are covered, and the tariff for supply to EV charging stations is single-part and capped at the average cost of supply until 31 March 2028, at 0.7 times that cost during solar hours (9 am to 4 pm) and 1.3 times outside them. The guidelines require separate metering for each charging station. Check how your DISCOM applies these terms before relying on them.

Where the cost premium comes from

A roof-mounted plant reuses a structure you already own. A carport builds a new one. Our published band for commercial and industrial solar, ₹24,000 to 32,000 per kW excluding GST, describes rooftop plants and does not include carport structure. The premium is therefore a separate line to be priced after a survey, and we do not give a figure here. What drives it:

• Steel and foundations. Columns, beams and purlins sized for the module load and for wind uplift, with pile or pedestal foundations.
• Clearance. The height is set by the tallest vehicle that will park beneath, plus a margin. Cars, vans, trucks and buses need very different heights, and a taller canopy takes more steel.
• Span and layout. Wide spans reduce the number of columns that interrupt parking bays, at the cost of heavier beams.
• Drainage. Rain falls on a large impervious area and needs gutters and downpipes that discharge away from vehicles and walkways.
• Lighting and cabling. Luminaires under the canopy, cable routes from modules to inverter, and protection against vehicle impact on columns.
• Civil works. Resurfacing, bay marking, wheel stops and utility diversion.

Sizing a canopy: planning arithmetic

The Ministry of New and Renewable Energy's rooftop FAQ puts shadow-free area at about 10 sq. m per kW. A car bay of roughly 2.5 m by 5 m is about 12.5 sq. m, so as a planning allowance a bay supports a little over 1 kW, and about a hundred bays support something like 120 kW. Treat that as a first estimate: canopy geometry, tilt, module size and column positions change it. At roughly 120 units per kW per month in north India, 120 kW would generate around 14,000 units a month. Use the solar payback calculator for your own numbers.

When a carport pencils out

The test is incremental. Compare the extra cost of the structure with the value of what it adds: extra units where the roof was not available, the avoided cost of strengthening a roof, and any value placed on shade and EV charging. A carport does not generate more per kW than a roof, so the case rests on those additions and not on cheaper solar. The EV charging load calculator sizes the charging demand that a canopy might serve.

Testing the payback

Payback for a carport is the extra investment divided by the yearly benefit, and it needs two scenarios. First, where the carport replaces roof capacity you do not have, the benefit is the value of all its units, less running costs, and the cost is the full carport. Second, where you could have used the roof, the benefit is only what the carport adds beyond it, so the carport must justify its structure on shade, charging and space. In both cases the yearly value of units depends on the share you use on site, at the retail tariff those units would have cost, and on the rate for any exports. EV charging adds a use for daytime units, which raises the self-use share, and the solar-hour tariff for charging stations in the guidelines can lower the grid cost of the charging that solar does not cover. Run both scenarios through the calculator before you compare quotations, and ask each bidder to price the structure as its own line.

Approvals and design checks

• Structure and wind. An open canopy sees high uplift, and wind loads are taken from the National Building Code and IS 875 Part 3. A structural engineer should design the steel and foundations and certify them.
• Local body permission. A new structure, even open-sided, may need permission under the building bye-laws and may count in set-backs or coverage.
• Fire. Ask the fire officer whether the canopy changes access for fire appliances or the exposure to adjacent buildings. Our Fire NOC guide explains the process.
• Electrical. DISCOM connection, and the state electrical inspector's approval where the installation needs it. Charging equipment must meet the Bureau of Indian Standards and Central Electricity Authority safety requirements the guidelines cite; they also require electrical inspectorate clearance before energisation.
• ALMM. As of October 2026, the Ministry of New and Renewable Energy's O.M. of 4 August 2026 treats net-metering plants and behind-the-meter plants differently; ask your installer which regime applies.

How Secured Engineers helps

We design in-house and file Fire NOC, CEIG and DISCOM net-metering applications in-house, so the canopy, the inverter room and the charger supply are designed together. MEPF and solar can sit under one contract. We work from offices in Noida (Delhi NCR) and Ludhiana, with 535+ projects across 18+ states and 89.77% repeat clients. A carport is priced after a survey of the parking area; the published band applies to rooftop plants only.

If you are weighing a canopy against roof-mounted solar, send a parking plan, a roof plan and a recent bill. See our EV charging installation service, message us on WhatsApp, call +91 70099 85817, or ask for a free proposal on solar.