Ground mount solar panels versus a rooftop system
Ground mount solar panels sit on a frame anchored in the soil instead of on the roof, which gives you better sun, easier snow clearing and no roof penetrations. The price is a higher cost per watt than a roof in many cases, plus foundations that must cope with Canadian frost.
When does a ground-mounted array make sense?
It suits properties with open land and a roof that is shaded, faces the wrong way, is too small or is near the end of its life. Farms, acreages and rural homes are the usual candidates, and so are owners who want a large system that the roof cannot hold. If the roof is fine, a rooftop array is normally cheaper and uses space you are not otherwise using.
Start by comparing the two options honestly. The roof requirements checklist shows how to judge your roof, and the best solar panel direction in Canada explains why direction matters. A ground mount lets installers choose both the direction and the tilt freely, and place panels away from tree and building shade.
What types of ground mount are there?
Fixed racks hold panels at one angle all year and are the most common choice because they have no moving parts. Pole mounts carry a small group of panels on a single post and suit modest systems. Trackers follow the sun and raise output, but they add cost and maintenance and are less common on homes.
The foundation matters as much as the rack. Options include driven or screwed steel piles, concrete piers and ballasted bases. In Canada the ground freezes and thaws, and frost heave can lift shallow footings, so the foundation design has to account for frost depth and soil type. Rock, clay and high water tables each change the approach, which is why an engineered design is valuable.
What do ground mounts cost compared with a roof?
Expect a higher cost per watt than a roof in many cases. The extra items are the foundation, the steel frame, trenching for cable to the house, possibly fencing and the added labour. Roof systems avoid most of those, though they may need roof work. Prices change by region, season and soil, and quotes are the only reliable guide. Our cost pieces, solar panel cost in Canada and price per watt explained, show what to compare.
Part of the extra cost can be offset by easier access. Cleaning, snow clearing and repairs are simpler when panels are at waist or shoulder height. Ask quotes to separate hardware, foundation, trenching, electrical work and permits so you see where the extra money goes.
How do snow, frost and wildlife affect a ground array?
Snow on the ground can bury the lowest row of panels, so a frame needs enough height above the expected snow depth and drifting. Sloped panels shed snow once it warms, and the guide to snow removal for solar panels covers safe clearing. Keep vegetation low so that grass and weeds do not shade the bottom edge, and consider animals that chew cables or nest under the array.
Wiring runs underground to the building, so trench depth and cable protection matter. Plan the route to avoid future digging, septic fields and water lines.
What permits and rules apply to ground mounts?
Ground arrays often face stricter land-use rules than rooftop ones. Zoning, setbacks from property lines, height limits and rules for agricultural land can all apply, and utilities may review a large system more closely. Our solar panel permit guide lists the usual approvals, and farm owners can read about funding routes in the Alberta farm solar funding guide.
Before you sign, ask the installer for a site plan, the foundation design, the cable route and a clear warranty. Use how to compare solar panel quotes to line up the offers. The old Drake Landing collector field used a very different, heat-collecting layout on garage roofs, described on the solar collection page.
Quick answers
Are ground mount solar panels more expensive than rooftop?
Often, per watt, because of the foundation, frame and trenching. The gap varies with soil, site and region, so compare written quotes for both.
How deep do ground mount foundations need to be in Canada?
Deep enough to account for local frost depth and soil conditions. The installer's engineered design sets the figure for your site.
Do ground mount panels produce more electricity?
They can, because the tilt and direction can be set freely and shade avoided. A good roof can match that, so the difference depends on your property.
Can I put a ground mount on farmland?
Possibly, but land-use and zoning rules can limit it. Check with your municipality and utility, and read the funding programme terms if you plan to apply.