Maximizing Solar Capacity in Existing Carports

Transforming an existing carport into a Super Charging Station-the EV era's equivalent of a gas station-is becoming an increasingly important trend in future urban transportation infrastructure. As electric vehicle adoption continues to accelerate, the demand for fast, convenient, and sustainable charging solutions is growing rapidly.
Repurposing existing carport spaces offers a highly efficient solution. Not only does it avoid the need for additional land, but it also creates an opportunity to integrate solar generation, energy storage, and EV charging into a single facility. Such a system can provide three key benefits simultaneously: weather protection for vehicles, clean energy generation, and convenient charging services.
In these Super Charging Stations, one critical design challenge quickly emerges: how can we install as many solar modules as possible within a fixed footprint?
The more photovoltaic modules installed, the greater the energy generation capacity. Increased solar production can significantly improve the station's energy self-sufficiency, reduce electricity costs, and potentially generate additional revenue through exporting excess electricity back to the grid.
Tammy Renewable is currently working on a project that faces exactly this challenge. The client wants to maximize the solar capacity of a carport system within an existing parking lot. However, with limited available space, how can installed capacity be increased without substantially increasing project costs?
A common approach is to use longer beams to expand the roof coverage area. However, this solution is often constrained by structural limitations, column spacing requirements, and rising material costs. So, is there a smarter alternative?
Our answer is yes.
The solution lies in what we call "space-maximizing cantilever design"-extending the cantilever area to accommodate one or even two additional rows of PV modules.

As shown in Figure 1, the cantilever refers to the portion of the roof structure that extends beyond the outermost support column.

 

 

In conventional Solar Power Carport designs, the cantilever length is typically limited to approximately the width of a single PV module. Extending it further may introduce concerns related to structural stability, excessive deflection, and increased wind loading.
However, when additional columns cannot be installed beneath the cantilever-such as when the area below serves as a traffic lane, entrance, or vehicle circulation route-alternative structural solutions become necessary.

One source of inspiration comes from airport terminal buildings.

Airport roofs often feature large spans and substantial cantilevered sections while maintaining exceptional structural stability and wind resistance. One of the keys to their performance is the use of supplementary support systems, such as diagonal bracing, trusses, and space-frame structures, which effectively transfer loads from the cantilevered areas back to the main structural framework.
This same engineering principle can be applied to metal solar carport.
As illustrated in Figure 2, additional support elements can be incorporated behind or alongside the cantilevered section. Examples include V-shaped braces, transverse trusses, tension rods, or other auxiliary structural members.

These enhancements can significantly increase the load-carrying capacity of the cantilever, allowing one or two extra rows of PV modules to be installed without changing the column spacing or adding new foundations and support columns.
At the same time, the open space beneath the carport remains unobstructed, preserving vehicle access, parking functionality, and pedestrian circulation.

From our perspective, this approach offers several important advantages.
First, it maximizes the utilization of space that would otherwise remain underused. Second, it avoids costly civil works and major structural modifications associated with adding new columns. Third, it increases solar generation capacity while maintaining the functionality of the parking area.
This solution is particularly attractive for retrofit projects where the available footprint is fixed and horizontal expansion is not possible, yet higher installed capacity is desired.
Naturally, every project must undergo detailed structural analysis before implementation. Local wind loads, snow loads, seismic requirements, and building codes must all be carefully evaluated to ensure safety and compliance.
Nevertheless, the concept itself is highly promising and deserves broader consideration within the solar carport and solar-storage-charging industry.
If you are developing a solar carport or integrated solar-storage-charging project, consider adopting a design philosophy that maximizes every available square meter. In many cases, those additional one or two rows of PV modules may be the difference between a project that merely breaks even and one that delivers long-term profitability.