Solar for warehouses and cold storage facilities

Warehouses, logistics parks and cold storage facilities have grown rapidly around Chennai and other industrial corridors in Tamil Nadu. Their large, flat or gently sloping roofs are an obvious place for solar. But the business case differs significantly between an ambient warehouse with lights and forklifts, and a cold store running refrigeration around the clock.

Why warehouses suit solar

• Large roof areas with few obstructions
• Simple roof shapes — often long, uniform metal sheet roofs
• Single-storey buildings with good solar access
• Growing electrification — electric forklifts, automation, EV charging

Load profiles differ

Ambient warehouses

Load comes from lighting, material handling equipment, offices, fans and sometimes automation. Daytime load may be modest compared with the roof's solar potential. Result: a roof-filling system could generate much more than the facility uses, making export rules crucial. See net metering vs gross metering.

Cold storage

Refrigeration runs continuously and works hardest when it's hot — which is when solar generation is often strongest. This makes cold storage one of the better matches for solar. Night-time load remains, which solar alone can't cover.

Distribution centres with automation

Conveyors, sorting systems and charging stations can create substantial daytime load, improving solar self-consumption.

See matching solar to your load profile.

Roof considerations

Roof type

Many warehouses have metal sheet roofs. Mounting systems attach to the roof sheets or the purlins beneath. The method affects weather-tightness and roof warranty.

Structural capacity

Lightweight roofs may have limited spare capacity for solar loads. A structural assessment is essential. See rooftop solar structural checks.

Roof life

Installing on a roof due for replacement means removing and reinstalling the system later. Coordinate roof replacement and solar installation.

Skylights

Translucent roof panels for daylighting can't host modules and are fragile — a safety risk during installation and maintenance.

Insulated panels

Cold stores often have insulated sandwich-panel roofs. Penetrations must not compromise insulation or create condensation problems.

Fire safety

Warehouses can store large quantities of combustible goods. Fire safety needs attention in solar design:

• Access paths for firefighters on the roof
• Rapid shutdown or isolation capability where required
• Cable routing and protection
• Compliance with applicable fire safety codes and insurer requirements

Discuss the design with your insurer and fire safety advisers.

Tenancy and ownership

Many warehouses are leased. Typical arrangements:

• Landlord installs and sells power to the tenant, or uses it for common areas
• Tenant installs with landlord consent
• Third party installs under an OPEX model with landlord and tenant agreements

Key issues are roof access, responsibility for roof damage or leaks, what happens at the end of the tenancy and who receives the benefit. See CAPEX vs OPEX solar.

Developers of new warehouses

For new warehouses, planning for solar at design stage costs little and adds value:

• Design roof structures with capacity for solar loads
• Plan cable routes and inverter locations
• Orient and size roofs to maximise usable area
• Provide safe roof access

See warehouse and logistics site selection.

Maintenance

• Cleaning is easier on accessible roofs, but dust from nearby roads and yards may raise soiling. See module soiling and cleaning.
• Safety systems — anchor points, walkways, guardrails — are essential for maintenance on warehouse roofs.
• Inspect roof penetrations regularly for leaks.

Batteries and cold storage

Batteries could help cold stores cover evening refrigeration load with stored solar energy, or keep critical refrigeration running during grid outages. The economics depend on costs and tariffs. See battery storage for industrial sites.

Common mistakes

• Filling the roof without checking load or export rules
• Ignoring structural limits of lightweight roofs
• Installing on a roof near the end of its life
• Overlooking fire access and insurer requirements
• Unclear landlord–tenant arrangements

EV charging and electrification

Logistics operations are electrifying — electric forklifts, delivery vans and trucks all need charging. Charging during the day, when solar is generating, can raise self-consumption significantly at an ambient warehouse whose own load is light. When planning solar, consider how vehicle charging will grow over the coming years, and whether charging schedules can be shifted into solar hours.

Questions to ask before installing

• What is the roof's structural capacity, and how old is the roof?
• How much daytime load does the facility have now, and how will it grow?
• What metering and export arrangement applies?
• Who owns the building, and who will own the system?
• What do the insurer and fire safety advisers require?

Logistics parks with many tenants

In a multi-tenant logistics park, solar may be owned by the park developer and shared across buildings or used for common loads such as lighting, security and pumping. Metering and billing between the developer and individual tenants must then be clear and consistent with applicable regulations. These arrangements are easiest to set up when the park is designed, rather than retrofitted after leases are signed.

How we help

Through C&I solar and warehousing and logistics land work, we help warehouse owners, developers and tenants assess solar suitability, structure arrangements and coordinate EPC partners for design and installation.