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A solar carport is a structure project that happens to generate electricity. That ordering matters: the canopy has to stand up, drain, and let vehicles move under it long before anyone looks at the yield. Projects get into trouble when the array is designed first and the structure is asked to accommodate it afterwards.
This page is for facilities and commercial developers specifying a carport, and for the EPC who has to get it through structural review. It covers the decisions that are expensive to change later, in the order they need to be made.
The parking layout sets the structure
Column position is the first decision, and it is made by the parking layout rather than the array. A column that lands in the middle of a bay removes a space; a column that lands on a bay line usually removes none. Getting this right is the difference between a carport that pays for itself in parking terms and one that costs spaces.
Door swing is the constraint people forget. A column placed to preserve the bay width can still make the space unusable if it blocks a driver’s door. The check is simple — draw the door open — and it is much cheaper than moving a footing.
Clear height is a vehicle question
Set the required clear height from the vehicle envelope, site access needs and local requirements. Include the tallest vehicle that must pass under the canopy: a delivery van, a maintenance vehicle, an ambulance at a healthcare site, or an RV at a dealership. Setting the height from the fleet rather than from the code minimum avoids the most expensive possible retrofit.
Cantilever is the usual structural problem
Single-row cantilever canopies — columns on one side, canopy reaching out — are popular because they keep the drive lane clear. They also put a large moment into the footing, which means the foundation is bigger and the uplift case governs the design more often than on a two-column structure. It is a good solution, but the foundation should be sized honestly from the start rather than value-engineered into a problem.
Water has to go somewhere deliberate
A canopy is a roof. If it does not have gutters and downpipes, it will drip along its whole edge, and the edge is exactly where people walk and park. Two options are standard: a gutter and downpipe system that discharges into the site drainage, or a controlled drip edge where the surface below is designed to take it. Both are acceptable; doing neither is not.
On sites with drainage requirements or a stormwater permit, the canopy area counts as impervious surface. That is worth confirming before the layout is fixed, because it can change the size of an attenuation feature elsewhere on the site.
Shade is a specified outcome, not a by-product
If the reason for the carport is partly shade, then shade coverage should be specified like any other deliverable: what percentage of the parking area, over which hours, and whether full coverage or a gap pattern is preferred. A layout optimised purely for generation will concentrate modules for tilt and spacing; a layout optimised for shade will spread them. These are different drawings, and the difference should be a decision rather than an accident.
EV charging belongs in the first drawing
Running conduit to a parking bay after the surface is finished costs several times what it costs during construction. Even where chargers are a year away, the duct route, the spare capacity in the distribution board and the physical space for the chargers should be reserved now. On sites where the charging plan is uncertain, the usual approach is to duct a proportion of bays and leave the rest for a second phase.
Wind and snow behave differently on an open-sided canopy
A canopy is open on all sides, so it sees uplift on the underside as well as pressure on top, and that combination governs the design more often than on a building. Snow behaves differently too: it can slide from a canopy onto vehicles below, and it can drift against an adjacent building. Both cases are in the standard we design to, but both need the site geometry rather than a regional default.
Specifications at a glance
Configuration reference
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| Item | Typical specification | What decides it |
|---|---|---|
| Structure | Single-row cantilever, double-row, or full-span | Parking layout and how many bays must stay usable |
| Clear height | Typically 2.4 to 4.5 m, set by the vehicles using it | Car height, delivery vehicles, or RV and truck access |
| Column spacing | Set to the bay layout, commonly one column per two or three bays | Bay width, door swing and turning circle |
| Foundation | Cast-in-place pier, pad footing, or ballast where cutting is not allowed | Soil conditions and whether the surface must be restored |
| Wind load | Calculated to ASCE 7 or EN 1991-1-4, including uplift on the canopy | Region, terrain and the open-sided geometry |
| Snow load | Calculated from ground snow load with sliding and drift considered | Local code and adjacent roof or building geometry |
| Water | Gutter and downpipe, or controlled drip edge | Where the runoff has to go and local drainage rules |
| Module | Typically 540 to 600 W, framed, glass-backsheet or glass-glass | Span, wind class and the shade objective |
| Tilt | Usually 5 to 10 degrees, sometimes flat for appearance | Drainage, production model and the visual brief |
| EV provision | Conduit and spare capacity reserved, or chargers installed | How many bays need charging and when |
| Documentation | Structural calculation, foundation drawing, drainage note and torque specification as required | Document scope and responsible parties confirmed in the proposal |
| Warranty | Structure 10 to 12 years; modules 12 years product, up to 30 years performance | Model and order terms |
Figures are selection references. Confirm the final ratings, dimensions, available certifications and warranty against the current datasheet and written proposal for the selected model or system.
Questions buyers ask about solar carports
How many parking spaces do we lose?
Often none, if the column layout is set to the bay lines rather than to the array. Where spaces are lost, it is usually at the ends of rows or where turning circles have to be preserved. The layout drawing shows this before anything is ordered.
Can we put it on an existing unpaved or leased surface?
Yes, and this is where ballasted footings are worth considering, because they avoid cutting the surface and can be removed when a lease ends. They are larger than piers, so they need more area, and the ground has to be able to take the load.
Does it need planning permission?
Check the planning and building requirements with the local authority before ordering. Structural calculations, drainage information and elevations may be needed; confirm the submission documents and who prepares them in the project scope.
How much of the site’s electricity will it cover?
That depends entirely on the site load profile and the canopy area, not on the equipment. Carports generate most during the middle of the day, which suits sites with daytime load — offices, retail, warehouses with daytime shift — better than sites with an evening peak.
Can we install chargers later?
Yes, if the ducting and board capacity are reserved now. Retrofitting both is the expensive version, and it is the single most common change request we see on carport projects.
What to send us
Send the parking layout, the vehicle types that must pass under the canopy, the site location for wind and snow, and whether chargers are in scope now or later. We come back with a structural concept, the column layout, the foundation type, and a written delivery date.
EXPLORE FURTHER
Equipment & planning for this application.
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Send the bay count and the clearance you need
With the number of bays, the required clearance height, and whether EV charging is to be provisioned, we confirm the structure, drainage and the electrical scope.
Send your requirementsOr reach us directly: +86 136 7367 3267 · sales@gtpsolar.com