Solar carports: how they work and what to plan

What is a solar carport and where does it make sense?

The panels sit on a frame of steel or aluminum posts and beams, tilted toward the sun, with space underneath for cars. Some designs cover a single driveway bay. Others span a whole parking lot at a shop, school, farm or apartment complex.

Carports make the most sense when the roof is the wrong place for panels. Maybe it is shaded, too small, near the end of its life or owned by someone else. A parking area with open sky above it solves all of that. The same sun-facing rules apply as anywhere, so the best solar panel direction in Canada is worth reading before you decide where the canopy should point.

What does a solar carport cost compared with a roof system?

Plan on paying more per watt than for panels on a roof. The panels are the same, but you also buy posts, beams, concrete footings or piles, electrical trenching and often engineering drawings. Total cost depends on the number of parking bays, the span, snow load design, soil conditions and distance to the electrical panel, and prices change from year to year. Quotes decide, and our guides on solar panel cost in Canada and price per watt explain how to compare them on a like-for-like basis.

The structure also does a second job. It replaces a covered parking shelter that you might otherwise build separately, so ask each installer to price the carport and the solar portion on separate lines. That makes the comparison with a plain shelter honest.

How do snow, wind and frost affect the design?

A carport is an open structure, so wind and snow act on it differently from a pitched house roof. Designers size posts and footings for the local snow and wind loads, and footings need to reach below the frost line in most of Canada. A tilted array also sheds snow more easily than a flat one, which helps winter output. Read solar panels in winter in Canada for what to expect, and solar panel snow removal before you consider raking.

Clearance matters in a cold climate too. Snow sliding off the lower edge can pile up beside parked vehicles, and the canopy has to be high enough for the trucks, vans or horse trailers that will actually use it. Raise these points with the installer early.

What approvals and electrical connections are involved?

A carport is a building, so expect a building or development permit as well as the electrical permit and the utility's interconnection approval. Municipal rules about setbacks and structures differ, and some require stamped engineering. Start with your municipality, and for an Alberta example see solar panel permits in Alberta.

The electricity is routed from the canopy to the building's panel, which means trenching or conduit across the lot. Choose between a system that exports to the grid and one that stays off it in line with grid-tied versus off-grid solar. Inverter choice is covered in solar inverter types. If you plan to charge vehicles, tell the installer, because it changes the electrical design and the sizing.

How do you compare carport quotes?

Ask for itemized, written quotes covering the structure, panels, inverter, electrical work, permits and engineering, and ask for the expected annual production with the shading assumptions listed. The process in how to compare solar quotes applies, and the installer checklist shows what to confirm. Check who owns the structural warranty, because the frame and the panels may be guaranteed by different companies. Confirm with your insurer how the canopy and the vehicles under it are covered, using solar panel insurance as a starting point.

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