Introduction
Not every car park is suitable for a commercial solar canopy. While many sites have sufficient space, a successful project depends on far more than the number of parking bays available.
A commercial solar canopy is a permanent engineered structure that must integrate with the existing site, electrical infrastructure and day to day operations. Before any design work begins, Energy Gain undertakes a detailed feasibility assessment to establish whether a solar canopy is technically suitable, financially viable and capable of meeting the client’s long-term objectives.
This lesson explains the key factors that determine whether your site is suitable for a commercial solar canopy installation.
Why a Feasibility Assessment is Essential
Every commercial solar canopy project begins with understanding the site. A feasibility assessment allows the project team to identify opportunities, highlight potential constraints and ensure the proposed system can be delivered safely, efficiently and with minimal disruption.
The assessment also provides the information needed to develop an accurate financial model and determine the optimum system size.
Available Parking Area
The first consideration is whether sufficient parking is available.
The layout of the car park will influence:
- Number of parking spaces available
- Vehicle circulation
- Traffic flow
- Emergency access
- Pedestrian routes
- Disabled parking provision
- Future expansion
- Temporary car park solutions during construction
Solar canopies can often be installed in carefully planned phases, allowing businesses to maintain parking capacity during construction while minimising disruption to daily operations.
Energy Consumption
One of the most important factors is how the business consumes electricity.
Energy Gain analyses half-hourly electricity consumption data to understand:
- Daily electricity demand
- Peak consumption periods
- Weekend operation
- Seasonal variations
- Future electrical demand
- Introduction of EV chargers and utilisation rates
The objective is to maximise self-consumption rather than simply generating the largest amount of electricity.
Expert Insight
A large car park does not automatically justify a large solar canopy. The optimum system size is determined by the site’s electricity demand profile, ensuring the electricity generated is used on site wherever possible to maximise financial return.
Available Electrical Infrastructure
The existing electrical infrastructure must be capable of accommodating the new generation equipment.
The assessment includes:
- Main LV distribution board
- Incoming electrical supply
- Transformer capacity
- Cable routes
- Switchgear
- Existing generation
- Available connection points
Early assessment helps identify whether electrical upgrades are required and ensures sufficient capacity is available for both the solar canopy and any future expansion, including battery storage and EV charging.
Grid Connection
Every commercial solar canopy requires a Distribution Network Operator (DNO) assessment.
The DNO review considers:
- Available network capacity
- Maximum export capacity
- Import capacity
- Export limitations
- Grid reinforcement requirements
- Future battery storage opportunities
Obtaining early DNO approval reduces programme risk and helps establish the most appropriate connection strategy.
Parking Layout
The physical arrangement of the parking area has a significant impact on both engineering design and construction costs.
Typical considerations include:
- Parking bay dimensions
- Traffic aisles
- Turning circles
- HGV access
- Emergency vehicle routes
- Existing lighting columns
- Landscape features
- Signage
- Pedestrian routes
- Drainage
- Future parking requirements
The canopy should enhance the parking environment without affecting vehicle movements or operational efficiency.
The image below shows a typical section drawing of a mono pitched solar canopy
Optimising the Canopy Layout
One of the most important engineering decisions is determining the overall canopy arrangement.
Where site conditions allow, longer uninterrupted canopy runs are generally more economical than multiple smaller structures. A continuous canopy spanning a greater number of parking spaces typically requires fewer structural supports, reducing the quantity of fabricated steel, foundations and installation time.
Reducing the number of vertical uprights not only lowers construction costs but also improves vehicle manoeuvrability, increases driver visibility and creates a cleaner architectural appearance.
During the feasibility stage, Energy Gain assesses several layout options to identify the most practical, cost-effective and visually attractive solution.
Benefits of Longer Canopy Runs
Longer, straighter canopy runs can provide several advantages:
- Fewer vertical uprights and structural columns.
- Reduced structural steel requirements.
- Fewer foundations and lower concrete volumes.
- Reduced excavation works.
- Faster installation programme.
- Lower construction costs.
- Improved vehicle circulation.
- Better parking accessibility.
- Reduced long-term maintenance due to fewer structural connections.
- Lower installed cost per kWp.
Every site is different, and the final layout will depend on traffic movements, parking geometry, underground services, planning constraints and structural engineering requirements.
Expert Insight
Commercial solar canopies are not simply designed to maximise the number of solar panels. Good engineering seeks to optimise the entire structure. Longer canopy runs with fewer structural supports often provide the most efficient balance between construction cost, operational functionality and long-term value.
Existing Underground Services
Before structural design begins, underground services must be identified.
Typical services include:
- Electricity
- Gas
- Water
- Surface water drainage
- Foul drainage
- Telecommunications
- Fibre optic cables
Utility surveys help determine suitable foundation locations and cable routes while reducing the risk of unforeseen issues during construction.
Ground Conditions
Unlike rooftop solar, commercial solar canopies require structural foundations.
Ground conditions influence:
- Foundation design
- Excavation requirements
- Ground bearing capacity
- Concrete volumes
- Drainage
- Construction methodology
Where necessary, ground investigations are completed before the structural design is finalised, ensuring the foundations are designed specifically for the site’s ground conditions.
Planning Considerations
Planning requirements vary depending on the location and scale of the project.
Typical considerations include:
- Site location
- Conservation areas
- Listed buildings
- Flood risk
- Tree protection
- Visual impact
- External lighting
- Local planning policy
Early engagement with the planning authority can help avoid delays during project delivery.
Future EV Charging
Many organisations intend to increase electric vehicle charging over the coming years.
Designing the canopy with future EV infrastructure in mind allows:
- Additional charging points
- Increased electrical capacity
- Future battery storage
- Load management
- Smart charging integration
Considering future demand during the design stage is significantly more cost-effective than making alterations later.
Health & Safety
The site assessment also considers operational safety.
Areas reviewed include:
- Pedestrian segregation
- Emergency access
- Fire appliance access
- Vehicle movements
- Construction access
- Temporary traffic management
- Equipment storage & security
- Public protection
Health and safety planning begins during feasibility and continues throughout the project lifecycle.
Environmental Considerations
Every site is assessed for environmental constraints, including:
- Existing trees
- Drainage systems
- Ecology
- Biodiversity
- Surface water management
- External lighting impacts
Where required, specialist environmental surveys are undertaken to support planning and construction.
Typical Information Required
To complete an initial feasibility assessment, Energy Gain will typically request:
- Recent electricity bills.
- Half-hourly electricity consumption data.
- Site address.
- Car park layout drawings.
- Site photographs.
- Existing electrical drawings (where available).
- Future expansion plans.
- EV charging strategy.
- Sustainability objectives.
This information enables the engineering team to prepare an initial concept design together with a detailed financial appraisal.
Project Insight
A recent feasibility assessment identified sufficient space for a 16-bay mono-pitch commercial solar canopy while maintaining vehicle circulation, pedestrian routes and emergency access. By increasing the canopy length and reducing the number of structural supports, the engineering team developed a more efficient layout that reduced steelwork, foundations and installation costs without compromising energy generation or parking functionality.
faqs
How many parking spaces are required?
There is no minimum requirement. Suitability depends on available space, electricity demand and the client’s objectives.
Can a canopy be installed while the car park remains operational?
Yes. Most projects are delivered in carefully planned phases, allowing sections of the car park to remain operational throughout construction.
Is planning permission required?
Many commercial solar canopies require planning approval. Requirements vary depending on the site location and local planning authority.
What if the ground condition is poor?
Foundation design is determined following site investigations. Challenging ground conditions do not necessarily prevent a project but may influence the structural solution and construction methodology.
Can the canopy be expanded in the future?
Many systems can be designed to allow future expansion, provided sufficient parking space and electrical capacity are available.
Key Learning Points
After completing this lesson you should understand:
- How Energy Gain assesses the suitability of a commercial solar canopy project.
- Why electricity consumption is more important than the number of parking spaces.
- How parking layout influences both construction costs and operational efficiency.
- Why longer canopy runs can reduce structural costs.
- The importance of electrical infrastructure and DNO approvals.
- How underground services and ground conditions affect foundation design.
- Why planning, health and safety and future EV charging should be considered from the outset.
Lesson Summaries:
- Lesson 1: What are commercial solar canopies?
- Lesson 2: Is your site suitable for a commercial solar canopy?
- Lesson 3: Building the financial business case for a commercial solar canopy
- Lesson 4: Pre-construction planning
- Lesson 5: Construction & installation
- Lesson 6: Commissioning, testing, and handover
Related Services:
Energy Gain solar canopy service
Solar canopy cost and savings calculator
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