Warehouse vs factory solar: how the two compare
The short answer: factories tend to pay back faster because they use more power in daylight, while warehouses have bigger, simpler roofs that are cheaper to build on. For both, the right system size comes from your half-hourly data.
At a glance
| Warehouse | Factory | |
|---|---|---|
| Demand in daylight | Moderate: lighting, conveyors, charging | High: machinery, compressed air, process heat |
| Roof | Large, open, modern portal frame | Varied age and type; more plant and rooflights |
| Sizing approach | Size to demand, not roof area | Often limited by roof or grid before demand |
| Indicative payback* | About 3.5 to 4.5 years | About 3 to 4 years (multi-shift) |
| Common add-ons | EV and forklift charging, battery | Battery for weekends, power monitoring |
| Check first | Lease length and landlord consent | Roof structure and G99 capacity |
*Indicative pre-tax ranges from our ROI and payback guide. Not a quote.
Where warehouses win
Large, clear roofs mean fewer design compromises and a lower cost per kWp. Distribution sites that add electric vehicles or forklift charging can use much more of the output. Tenants should check their lease first; see solar panels for warehouses and the warehouses and logistics page.
Where factories win
Heavy daytime demand means most units replace electricity you would otherwise buy. The limits tend to be the roof and the grid connection, so book a structural survey and check G99 capacity early. See solar panels for factories and the factories and manufacturing page.
Warehouse or factory, start with your data
Run the calculator for a quick figure, then send 12 months of half-hourly data for a free feasibility review sized to how your site really uses power.
Frequently asked questions
Is solar better for a warehouse or a factory?
A multi-shift factory usually gets a faster payback, because it uses more of the power generated. A warehouse usually has a cheaper, simpler roof to build on. The better choice for any site depends on how much electricity it uses in daylight hours.
How should a warehouse size its solar system?
Size it to your daytime demand, using half-hourly data, rather than to the size of the roof. You can add capacity later if you install EV or forklift charging or a battery.
What roof issues are common on factories?
Older factory roofs can be fragile, contain asbestos-cement sheets, or be crowded with plant and rooflights. A structural survey is needed before design.
Does shift pattern matter?
Yes. A single-shift site uses less solar at weekends and early evenings, while two or three shifts keep demand high through daylight. Weekend shutdowns are a good reason to look at battery storage or export terms.
Who needs DNO approval?
Both, for larger systems. Factories more often run into export limits because their systems are large and their connections may already be heavily used.
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