How much land does solar need per kW
A fixed-tilt ground-mount array with modern panels needs about 6 to 12 m² of array area per kW at mid latitudes, or roughly 2 to 4 acres per MW including access and setbacks. Here is where those numbers come from and what changes them.
The formula
A 655 W module (2.382 m × 1.134 m), today's mainstream size, is about 243 W/m². Put two of them in portrait on each table (about 4.8 m of slope), face the equator, and size the rows for no shading at the times shown:
| Latitude | Tilt | Shade-free | Row pitch | Array only | Site (80 % use) |
|---|---|---|---|---|---|
| 35° | 20° | Solstice noon | 7.2 m | 6.2 m²/kW | 1.9 acres/MW |
| 35° | 30° | Solstice 9:00 to 15:00 | 9.6 m | 8.3 m²/kW | 2.6 acres/MW |
| 40° | 20° | Solstice noon | 7.8 m | 6.7 m²/kW | 2.1 acres/MW |
| 40° | 30° | Solstice 9:00 to 15:00 | 11.3 m | 9.7 m²/kW | 3.0 acres/MW |
| 45° | 30° | Solstice 9:00 to 15:00 | 14.1 m | 12.2 m²/kW | 3.8 acres/MW |
You will often see "5 to 7 acres per MW" for utility plants. That figure includes older, less efficient modules, trackers, wide setbacks and everything else inside the fence. For a home or farm ground mount with current panels, the table above is closer.
What changes the land you need
- Latitude: the further from the equator, the lower the winter sun and the wider the rows.
- Tilt and shading rule: lower tilt, or accepting some winter morning shade, packs more panels in. See the row spacing guide.
- Ground slope: a slope facing the equator lets you tighten rows; a slope facing away needs more room.
- One row or many: a single row has no row-to-row shading at all, so small systems often need far less than these numbers suggest.
- Site shape and setbacks: odd shapes and property-line setbacks can drop the use factor well below 80 %.
See how many kW fit on your land
Draw your site boundary on the satellite map: panels are laid out automatically, and you get capacity, row pitch, 3D terrain shading and annual energy. Free.
Try it free →FAQ
How many acres for a 1 MW solar farm?
With modern panels on fixed racks, about 2 to 4 acres for the array and its access. Plan for more if the site is irregular or setbacks are large.
How much space does a 10 kW ground mount need?
About 60 to 120 m² (650 to 1,300 sq ft) of ground, depending on tilt and whether it is one row or several.
Does a roof need the same area?
No. Panels flush on a sloped roof need no row gaps, so about 4.2 to 4.7 m² per kW is enough.