Warehouses vs factories vs cold storage: which sites get the most from commercial solar?
The short answer: all three are strong fits for solar, but for different reasons. Cold storage usually pays back fastest because it uses almost every unit generated. Factories come close where they run more than one shift. Warehouses have the best roofs, but the system must be sized to daytime demand rather than to the roof.
Side-by-side comparison
| Warehouses | Factories | Cold storage | |
|---|---|---|---|
| Typical demand | Daytime lighting, conveyors, forklift charging | Machinery, compressed air, process loads, often multi-shift | Refrigeration 24/7, peaks on warm afternoons |
| Share of solar used on site | Lower unless sized carefully | High on multi-shift sites | Very high |
| Roof | Very large, simple, unshaded | Mixed: sheds, saw-tooth, plant on roof | Insulated panel roofs, plant and condensers |
| Indicative payback* | About 3.5 to 4.5 years | About 3 to 4 years | About 2.5 to 3.5 years |
| Battery storage fit | Useful if demand is low or export is capped | Useful for weekend shutdowns | Useful to cover evening and night cooling |
| Main risk | Oversizing; short leases | Roof structure; G99 export limits | Roof condition; electrical design for cooling loads |
*Indicative pre-tax ranges from the worked examples in our ROI and payback guide. Not a quote or guarantee; your result depends on demand, tariff, roof and system cost.
Warehouses: biggest roofs, size to demand
Warehouse roofs are usually large and unshaded, which keeps installation cost per kWp low. The trap is filling the roof when daytime use is modest. Size to your demand, or add EV and forklift charging or a battery to use more. Read the warehouse solar guide and the warehouses and logistics page.
Factories: high use, check the roof and grid
Factories running machinery through the day use most of what solar generates. The questions are whether the roof can carry the load and whether the DNO will allow the connection. Read the factory solar guide, industrial solar panels and the factories and manufacturing page.
Cold storage: nearly every unit used
Refrigeration demand is highest on warm, sunny afternoons, exactly when panels produce most, so very little is exported. Roof condition and the electrical design need care. Read the cold storage solar guide and the cold storage and food production page.
More detailed comparisons
Which category is your site in?
The calculator gives a quick indicative saving. A free feasibility review then uses your half-hourly data to size the system to your real demand.
Frequently asked questions
Which type of site gets the fastest solar payback?
Cold-storage sites usually come out fastest, because refrigeration runs around the clock and uses almost all the solar power generated. In our indicative modelling cold storage pays back in about 2.5 to 3.5 years, multi-shift manufacturing in about 3 to 4 years and warehousing in about 3.5 to 4.5 years. Your own figures depend on your demand, tariff and roof.
Why do warehouses pay back more slowly if they have the biggest roofs?
A large roof can hold far more panels than an ambient warehouse with lighting, conveyors and chargers can use during the day. Unused power is exported for less than you pay to buy it, so the system has to be sized to your daytime demand, not your roof.
Do factories need battery storage with solar?
Not usually to start with. Continuous or multi-shift factories use most solar output as it is generated. A battery helps more where production stops at weekends or where the grid connection limits export.
Is solar worth it for a cold store that runs at night?
Yes, because cooling demand is still high during daylight, when solar generates. Overnight demand is met from the grid or, if the numbers work, from a battery charged during the day.
What is the biggest risk for each site type?
For warehouses it is oversizing the system and leases that end before payback. For factories it is roof structure and grid connection approval. For cold storage it is roof condition on insulated panels and making sure the system design suits refrigeration loads.
How do I compare my own site?
Use the calculator for a quick estimate, then request a free feasibility review with 12 months of half-hourly data so the system can be sized against your actual demand.
Read next
Related guides & sector pages
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