Solar for Warehouses and Logistics Parks: Sizing, Roof, Approvals and Payback (50 kW+)

A warehouse or logistics park suits a 50 kW+ solar plant mainly for its roof, not its own load. Most warehouses use little power, so a plant sized to the roof exports, and net metering stops paying beyond what the meter consumes. The workable routes are sizing to the landlord's load, putting the plant on tenant meters, or a shared route such as group captive or open access.

Why is a warehouse roof not the same as a factory roof?

A factory uses what its roof makes. A warehouse often has a large roof and a small load: lighting, dock equipment, offices, and fans or chillers in some buildings. The roof can host many times more than the meter can absorb. So the first question is not how many kW fit, but who will use the units.

Three limits apply together, and the smallest wins:

• Consumption. Under the Punjab and Haryana rooftop regulations of 2021, generation is capped at 90% of the consumer's consumption in the settlement period, and surplus beyond it earns nothing in net metering. A lightly used warehouse can hit this limit with a small plant.
• Sanctioned load. Punjab limits non-domestic rooftop AC capacity to 70% of sanctioned load or contract demand; Haryana allows net metering up to 500 kW or the sanctioned load, whichever is lower. Our sanctioned load calculator shows the headroom.
• Roof. Usable area after skylights, ridge vents, gutters and shade, and what the structure can bear.

Who uses the power in a landlord and tenant park?

In a logistics park the roof belongs to the landlord, while the power is bought by tenants on their own meters, often on short leases. A solar plant has a 20-plus year life, so the commercial structure decides more than the engineering. These are the usual routes.

HERC's 2021 regulations describe the third-party model: the developer leases the system and remains the owner of the equipment, the rooftop owner provides the roof, and generation meets the consumer's own needs with the excess exported under net metering. Group captive rules sit in Rule 3 of the Electricity Rules, 2005; the Ministry of Power amended them in March 2026 to clarify ownership, simplify group captive arrangements and set verification over the whole financial year. The Green Energy Open Access Rules, 2022 set the open-access threshold at 100 kW and a 15-day approval with deemed grant. Our guides to open-access solar and industrial solar EPC explain the off-site routes.

What is special about a PEB sheet roof?

Many warehouses are pre-engineered buildings with light metal sheeting on purlins, designed for a light load. Check four things before you quote.

• Load. The frame was designed for roof sheeting, not necessarily the weight of modules and structure plus wind uplift. Get the design loads from the PEB supplier or a structural engineer, and use the roof load calculator for a first check.
• Fixing. Clamp systems that grip the standing seam avoid roof penetrations; through-fixing needs sealed fasteners. Penetrations create leak paths over a 25-year life.
• Roof life. Sheeting that needs replacement in a few years should be replaced before the plant goes on, not after.
• Warranty. The sheet supplier's warranty may exclude damage from fixing, so ask early.

See our article on solar on a PEB sheet roof for more.

How do you size and judge the payback?

1. Pull twelve months of bills for every meter that will use the plant: kWh, maximum demand, sanctioned load, and the tariff category.
2. Find the daytime share. A warehouse operating one shift uses less than a cold store with compressors round the clock.
3. Pick the route from the table, and size to the smallest of the consumption on the meters the route serves, the cap and the roof.
4. Compute generation and the share used on site. Test it against the settlement-period rule.
5. Compare simple payback across routes using the avoided tariff, including any Time of Day bands: the Ministry of Power's amendment of June 2023 puts solar-hour tariffs 10% to 20% below normal for commercial and industrial consumers with demand of 10 kW and above from 1 April 2024.

Our published C&I band is ₹24,000–32,000 per kW excluding GST; see the 500 kW and 1 MW pages. Roof type, structure, wind design, cable run and interconnection voltage move a price inside it. A park with a large roof and small load can find that a lower price per kW buys nothing if the units go unused. A battery can shift some daytime generation to evening use; see battery energy storage. Put your own numbers into the solar calculator before judging.

What risks are specific to warehouses?

• Fire. Warehouses carry high fire loads and racking. Cables, inverters and isolators must be laid out so that fire services can isolate the plant, and the Fire NOC drawings should show it. See Fire NOC for warehouses.
• Tenant turnover. A tenant who leaves takes the load. Contracts need a clause for what happens to credits and payments.
• Landlord liability. Roof leaks and structural damage need a named responsible party.
• Power sold on. If the landlord supplies solar power to tenants for a charge, check with the DISCOM and a lawyer whether that is allowed in your state before you write it into leases.

How Secured Engineers helps

We design the plant in-house and file the DISCOM net-metering application, and the Fire NOC and CEIG files where needed, ourselves. MEPF and solar can be carried under one contract, which suits a warehouse that needs electrical, fire fighting and ventilation as well. We work from offices in Noida (Delhi NCR) and Ludhiana, on 535+ projects across 18+ states, with 89.77% repeat clients. See our warehouse MEPF contractor page too.

If you send the roof drawings, the meter list and twelve months of bills, we will tell you which route and size the load and the rules support. Start at solar for factories and large sheds, then message us on WhatsApp, call +91 70099 85817, or ask for a free proposal.