Why Carport Span Matters: Choosing the Right Solar Carport Structure

Before Tammy Renewable begins designing a solar carport, we ask our customers to complete a project information sheet. This form helps us understand key project requirements, including the parking layout, desired carport dimensions, photovoltaic module specifications, and the total number of solar panels to be installed.

Among all the information collected, one parameter is particularly important: the span.

The span refers to the distance between two support columns of the carport structure. This dimension directly affects the structural design, material requirements, installation cost, and the total number of photovoltaic modules that can be installed.

Depending on the project type and parking layout, several span options are commonly used.

 

A standard parking space is typically about 5 meters long and 2.5 meters wide. For residential applications, the distance between support columns is usually between 2.5 and 3.5 meters.

In many home installations, especially when the parking space is adjacent to a wall or building, a lightweight aluminum structure can be used. This not only simplifies installation but also provides additional fixing points, making the overall structure more efficient and cost-effective.

For carports within this span range, we generally recommend using photovoltaic modules measuring approximately 1722 mm × 1134 mm. This module size offers an excellent balance between energy output and structural compatibility for residential parking spaces.

 

Carport style	Module Angle	Packing Space	Module Array	Module Quantity	Output Per Module	Total Output(W)	Roof Area(m2)
Home Type	5°	1 cars	3*3	9	460	4140	337.5

Residential Solar Power Carport provide homeowners with clean energy generation while protecting vehicles from sunlight, rain, and snow. They are an ideal solution for maximizing the value of existing driveway or parking areas. 

 

For commercial or public parking areas where space is limited, a 5-meter span is a popular option.

In this configuration, the distance between columns is approximately 5 meters, while the overall roof length typically ranges from 5 to 6 meters. The design is compact, efficient, and well-suited for parking lots where maximizing parking density remains a priority.

Compared to residential systems, the larger span allows for a greater number of solar modules while maintaining a relatively simple structural framework.

This type of carport is commonly found in:

• Shopping center parking lots
• Supermarket entrances
• Office buildings
• Small commercial facilities
• Community parking areas

Carport style	Module Angle	Packing Space	Module Array	Module Quantity	Output Per Module	Total Output(W)	Roof Area(m2)
T Type	5°	14 cars	2*32	64	625	40000	182.5
		4cars	2*10	20	625	12500	60

 

The 5-meter span strikes a balance between installation capacity and structural economy, making it one of the most versatile carport configurations available.

 

When higher solar capacity is required, a 7.5-meter span often becomes the preferred solution.
With columns spaced approximately 7.5 meters apart, the roof length can extend to 10 meters or more. The resulting structure appears significantly larger and can be designed with greater clearance height to accommodate various vehicle types and site requirements.

This configuration is particularly popular for large commercial installations and integrated solar-storage-charging projects.
In fact, many Super Charging Stations-facilities that combine photovoltaic generation, battery storage, and EV charging infrastructure-choose this span configuration because it maximizes solar generation within a given parking footprint.
Compared with smaller-span designs, a 7.5-meter span can often accommodate more photovoltaic modules across the same parking area, resulting in:

• Higher installed capacity
• Greater annual energy production
• Improved project economics
• Enhanced energy self-sufficiency for charging stations

 

Carport style	Module Angle	Packing Space	Module Array	Module Quantity	Output Per Module	Total Output(W)	Roof Area(m2)
π Type	5°	36 cars	5*40	200	625	125000	489.6
		4 cars	5*5	25	625	15625	62.7

 

 

Carport style	Module Angle	Packing Space	Module Array	Module Quantity	Output Per Module	Total Output(W)	Roof Area(m2)
L Type	5°	18 cars	6*20	120	625	75000	337.5
		2 cars	6*3	18	625	11250	46.5

 

 For developers seeking to maximize solar output while minimizing land usage, this configuration is often the most effective choice.

 

Of course, not every project fits neatly into a standard design category.
Different sites may present unique challenges related to parking layouts, traffic circulation, local building codes, wind loads, snow loads, or architectural requirements. That is why Tammy Renewable provides customized engineering and design services tailored to each project's specific needs.
Our engineering team can develop optimized solutions based on the available space, target installation capacity, and structural requirements to ensure the best balance between performance, safety, and cost-effectiveness.
For example, some projects require unusually large cantilever sections to maximize solar coverage without adding additional columns. These specialized designs require unique structural approaches and engineering considerations.
In our next article, we will explore these large-cantilever solar carport solutions in greater detail and explain how they can help maximize photovoltaic capacity while maintaining structural integrity.
Stay tuned.