Solar basics 2 min read
How Much Space Does Solar Need on Roofs and Land?
How many square metres per kilowatt? A space guide for concrete roofs, metal roofs and ground mounts, and how shading and walkways change the maths.
GPS Engineering Team
Space is often what sets the maximum size of your plant, which is why the GPS calculator asks for your free area in square metres. But not every square metre of roof is usable; here’s how we work it out.
Key takeaways
- A modern ~620 W panel measures roughly 2.7 m².
- Tilted rows on concrete roofs need about 7–8 m² per kW because of row spacing.
- Flush mounting on metal roofs needs about 5–6 m² per kW.
- Shading, walkways and equipment are deducted from usable area.
Space by mounting type
| Mounting | Approx. area per kW | Notes |
|---|---|---|
| Flush on metal roof | 5–6 m² | Highest density |
| Tilted rows on concrete | 7–8 m² | Spacing avoids row shading |
| Fixed ground mount | 8–10 m² | Walkways for maintenance and vehicles |
| Car-park canopies | 6–7 m² | Double use of space |
Why rows need spacing
Tilted panels cast a shadow behind them, especially in winter when the sun is low. We set row spacing so shadows don’t fall on the next row during the main production hours. See optimal tilt in Egypt.
What gets deducted?
- Water tanks, stair rooms and satellite dishes.
- Outdoor AC units and vents.
- Maintenance walkways and edge clearances.
- Areas shaded by neighbouring buildings.
What if space is short?
- Choose higher-efficiency panels.
- Use canopies and façades.
- Accept partial coverage — it still pays off very well.
An engineer visits to measure the space, review consumption and give a final quote.
How much would your plant save?
Get system size, cost and expected savings in under a minute.
GPS engineers have designed and built solar plants across Egypt for 15+ years. Here they share what they learn in the field.
Frequently asked questions
Can panels go on pitched or tiled roofs?
Yes, with mounting systems designed for tiles and pitched roofs that preserve waterproofing.
Can I still use the roof after installation?
Yes. Walkways remain, and some designs raise structures to leave usable space underneath.
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