Risk Control for Commercial solar pv system installation: Fire Safety, Design and Best Practices
Commercial solar panels are a long-term investment, but every solar pv system installation carries risks that must be managed correctly. From fire safety and roof loading to electrical design, cabling and ongoing maintenance, careful planning helps protect both your building and your investment.
This guide is perfectly personalised toward UK businesses considering roof or commercial solar power ground mounted PV installations, helping you recognise risk control and make an informed decision with accurate facts.
Table of Contents
WHAT IS PHOTOVOLTAIC (PV) TECHNOLOGY?
Photovoltaic (PV) technology involves transforming sunlight into electricity with the help of special materials known as semiconductors, typically silicon. When solar radiation hits the surface of a PV cell, it creates electrons within the semiconductor, resulting in a direct current (DC) flow. This generated electricity can be harnessed to supply power to commercial, industrial, and agricultural facilities, as well as integrated into the wider utility grid.
KEY COMPONENTS OF A PHOTOVOLTAIC (PV) SYSTEM
A photovoltaic (PV) system consists of several key components, each engineered to optimise the conversion of solar irradiance into electrical power. The core element is the PV cell, a semiconductor device typically sized at 15 cm by 15 cm, responsible for converting sunlight directly into direct current (DC) electricity. Multiple PV cells are assembled into PV modules, which are then interconnected using MC4 connectors to form a PV array. These arrays are mounted on robust support structures, either fixed or fitted with solar tracking systems to increase solar yield throughout the day.
Within the pv system, electrical interconnections are managed via a junction box, which provides a secure and organised enclosure for linking individual modules and arrays. This ensures both operational safety and system reliability. The DC output generated by the PV array is then routed to an inverter, a critical power electronics component. The inverter converts the DC electricity into alternating current (AC) at the required grid frequency, making the energy suitable for on-site consumption or export to the national grid.
After conversion to AC, the transformer is utilised to step up the voltage to the appropriate level for distribution or grid connection. Transformers in PV systems can be either dry-type or oil-filled, depending on the specific requirements of the installation. To guarantee a continuous supply of power, even during grid interruptions, an uninterruptible power system (UPS) may be integrated. The UPS typically includes batteries and auxiliary electronics, providing commercial battery storage systems and safeguarding against power outages.
Overall, these components form the foundation of a commercial photovoltaic system, working together to increase solar energy capture and deliver consistent, renewable power for a wide range of applications.
WHAT ARE THE MAIN PV TECHNOLOGIES?
CRYSTALLINE SILICON PHOTOVOLTAIC (PV)
Crystalline Silicon Photovoltaic (pv) cells remain the industry standard for commercial solar power generation, with monocrystalline and polycrystalline modules representing the two primary options. Both types deliver high conversion efficiencies, making them particularly suitable for commercial and industrial installations where maximising energy yield is critical.
THIN FILM PV
Thin film PV cells represent a newer generation of solar technology, utilising significantly less silicon and offering a lower-cost manufacturing process. While these panels provide a cost-effective alternative, their reduced efficiency means they generate substantially less electricity per square metre compared to crystalline silicon modules.
KEY RISK CONSIDERATIONS FOR SOLAR PV SYSTEM INSTALLATION
Our approach to designing and installing photovoltaic (PV) systems is rooted in a thorough assessment of all critical factors to provide optimal performance and robust risk mitigation.
Fire safety is a primary consideration in our process. Rooftop fires present significant challenges, particularly when PV modules incorporate plastic elements and are mounted on combustible roofing substrates. To address these risks, our team implements proactive risk management strategies and precise system design, minimising the potential for fire propagation and safeguarding both the PV installation and the underlying structure.
The EN 13501-1 establishes fire safety standards, making sure that PV modules contribute to protecting people, property, and business operations.
When specifying, installing, or approving rooftop PV systems, it is important to require both IEC and Euroclass certification. This approach helps with compliance, reduces risk, and supports a safer, more sustainable future for your business.
For more information on EN 13501-1, we have a blog available about commercial pv solar IEC 61730 VS EN 13501-1: The importance of building-level fire evaluation for rooftop installations.
HOW WE MANAGE RISKS DURING A PV SYSTEM INSTALLATION
The main considerations when installing a solar pv system installation are the construction, layout, cabling, electrical installations, and fire protection. We have outlined the rule book that we follow for a successful and safe installation.
When we undertake a solar pv system installation, there are key factors such as structural integrity, roof layout, and system design that must be carefully evaluated.
At Excel Energy, we follow a precise set of industry best practices and safety protocols to guarantee each installation is accomplished to the highest standards of quality and reliability.
CONSIDERATION 1: CONSTRUCTION
When planning to install a photovoltaic (PV) system, it is important to start with a thorough design and site assessment. We confirm that the roof can safely support the weight of the PV installation and avoid installing PV systems on expanded polystyrene sandwich panel roofs.
For roofs with combustible coverings, we make sure that a fire-resistant barrier is applied and reviewed by relevant safety authorities for each project.
We use recommended fire-resistant barriers including gypsum or calcium silicate panels, fire-resistant protection blankets, and always use glass-backed, UL Class A rated PV panels for maximum safety on combustible roofs.
CONSIDERATION 2: LAYOUT
Careful planning of the pv system layout is important for both fire safety and ongoing maintenance. Maintaining a minimum distance of 2.5 meters between PV modules and fire compartment walls helps prevent fire from spreading across boundaries. In some cases, this distance can be reduced to 1.2 meters if the risk of fire spread is low.
The PV panels should never be installed over or too close to skylights, drains, or smoke vents. Keeping panels at least 1.2 meters away from skylights and ensuring roof and ground drains remain unobstructed enable proper emergency access and drainage. Walkways and clearances, such as 1.2 meters every 45 meters, are a necessity for fire brigade access and routine inspection.
We keep clearance of at least 150mm between panels and the roof, which allows for ventilation and reduces the risk of fire radiant heat feedback. To assure that smoke vents can open fully and that guttering is accessible for debris clearance are key factors in maintaining a safe and functional roof environment.
CONSIDERATION 3: CABLING
We follow precise cabling practices that are critical to achieving both operational safety and system efficiency. DC cabling routes are designed to be as short as possible to minimise voltage drop and reduce the risk of fire.
Where cabling passes through occupied areas, mechanical protection such as covered cable trays is required to ensure the safety of building occupants and facilitate safe access for emergency services.
All our metallic components, including mounting structures and cable containment systems, are effectively earthed using conductors with a minimum cross-sectional area of 6mm². For lightning protection, down-conductors should be specified at a minimum of 35mm².
The cabling is installed on mesh or perforated trays to maintain separation from combustible materials and to promote adequate ventilation. Only MC4-type connectors with an IP-68 rating are utilised to guarantee reliable, weatherproof terminations, and pierced connectors are strictly avoided.
CONSIDERATION 4: ELECTRICAL INSTALLATIONS
Inverters are always mounted on a freestanding metal frame or against a fire-resistive wall, never placed within 2 meters of combustible materials. Where possible, we opt for non-combustible, fully enclosed rooms with a minimum one-hour fire rating, complete with automatic smoke detection. All inverters are positioned for easy access and isolation, never on the roof, and we select models with ground-fault detection, arc flash detection, and harmonic mitigation features.
Transformers are separated from other building elements due to their fire risk, either by placing them in a two-hour fire-rated room or ensuring at least 10 meters of physical separation. For added emergency safety, we install a single, easily accessible AC isolator so that the Fire Department can quickly disconnect the pv system from the grid if needed.
Our installations comply with electrical regulations, including rapid shutdown devices at module level for systems with higher voltages, as required by codes such as NEC 690.12.
CONSIDERATION 5: FIRE PROTECTION
Fire protection is a vital focus in our pv system installations. We install dry risers on the roof, arranged and spaced according to recognised standards, to support manual firefighting operations and ensure that emergency responders have reliable access points.
We select only fire-resistant materials and ensure that any roof coverings beneath PV panels meet strict solar fire safety requirements. Where necessary, we add non-combustible barriers or covers, especially when panels are installed near combustible surfaces, to further reduce fire risk.
Our team also verifies that all emergency equipment, such as smoke vents, access walkways, and isolation switches, remains fully accessible after installation.
FREQUENTLY ASKED QUESTIONS ABOUT COMMERCIAL SOLAR PANEL INSTALLATION RISKS
WHAT ARE THE BIGGEST RISKS DURING A COMMERCIAL SOLAR PV INSTALLATION?
Commercial solar PV panel installation presents several significant risks that must be carefully managed. Key hazards include electrical dangers, fall risks, excessive structural loading, and potential fire hazards. If these risks are not addressed, they can lead to serious injuries, property damage, or operational downtime.
The primary risks can be grouped into two main areas: safety hazards during installation and long-term operational or structural concerns. During installation, falls from elevated rooftops are a major concern, making fall protection systems such as scaffolding and lifelines essential. Electrical hazards are another critical issue, as installers work with high-voltage DC systems. Proper safety protocols help prevent shocks, burns, and arc flashes. Additionally, slips, trips, and manual handling injuries can occur when workers move heavy panels and equipment across uneven or cluttered roof surfaces.
HOW CAN FIRE RISKS BE REDUCED IN SOLAR PV SYSTEMS?
To reduce fire hazards in solar PV systems, use qualified installers, require Arc Fault Circuit Interrupters (AFCIs) and Rapid Shutdown devices, and ensure that DC cables are properly routed and protected.
Regular maintenance, such as inspecting connections and removing debris, is essential. While solar PV systems are typically safe, proactive design choices, quality equipment, and ongoing maintenance are necessary to prevent problems.
HOW ARE COMMERCIAL SOLAR PV SYSTEMS MAINTAINED?
Commercial solar PV systems require ongoing solar panel maintenance, including remote system monitoring, regular site inspections, and scheduled cleaning by trained professionals.
Most commercial installations are serviced at least once per year, but facilities in areas with heavy dust, farming, or industrial pollutants often need servicing every six months to maintain efficiency and system reliability.
WHAT NATURAL HAZARDS AFFECT SOLAR PV SYSTEMS?
Solar PV systems are exposed to a range of natural hazards, including hail, strong winds, storms, flooding, lightning, and heavy snow. These events can damage solar panels, disrupt electrical components, and reduce the lifespan of the entire system. Proper installation and protective measures are essential to help solar PV systems withstand these environmental challenges.
NATURAL HAZARDS THAT CAN OCCUR WITH A SOLAR MODULE INSTALLATION
Natural hazards are inevitable when installing a system and require careful attention to local environmental conditions. We make sure that our installations withstand wind speeds, hail, dust storms, earthquakes, lightning, and snow loading.
Wind load assessments are followed, with added fixings or wind deflectors used for roof perimeter equipment where needed. Roof loading calculations are completed so that added weight from panels, snow, or debris does not compromise structural safety.
Panel supports are mechanically fixed to the main roof structure, avoiding adhesives or unreliable ballasts, and care is taken to maintain waterproofing and insulation integrity.
We have combined a list of natural hazards that can occur, and what practices we approach them with:
LIGHTNING PROTECTION
We prioritise the protection of commercial solar PV systems from lightning, particularly for rooftop installations. Our team designs and installs dedicated lightning protection systems, including air-termination rods and conductors, in accordance with current industry standards and best practices. We maintain a minimum separation of one metre between PV modules and lightning conductors wherever feasible. Where this is not possible, we specify high-voltage insulated conductors or implement equipotential bonding with surge arrestors to mitigate electrical hazards. All metallic components are fully integrated into the overall lightning protection system, and we install supplementary surge protection devices to safeguard sensitive electrical equipment.
OPERATIONAL CONSIDERATIONS
Safe operation of solar PV installations begins at the commissioning stage. Our team makes sure that panel covers remain in place until all electrical terminations are completed, eliminating the risk of accidental contact. We deploy advanced remote monitoring platforms to provide real-time performance data for both PV modules and inverters. Automated alarm notifications are configured to immediately alert our operations team or the client’s control centre to any system faults or anomalies, enabling rapid response and minimising downtime.
CRIME PREVENTION
Solar PV assets, including modules and cabling, are vulnerable to theft, particularly during the construction phase. To mitigate this risk, we secure ground-mounted arrays with robust perimeter fencing and enforce strict access control protocols for rooftop installations. For additional security, we specify tamper-resistant fasteners and apply forensic cable marking to deter theft and facilitate asset recovery in the event of loss.
PROTECTION AND DETECTION
We assess fire protection requirements for all critical areas, including electrical rooms and distribution cabinets, as part of our system design process. Where risk assessments indicate, we install automatic gaseous fire suppression and fire detection systems, which are linked to a 24/7 monitoring centre.
MAINTENANCE AND INSPECTIONS AFTER PV SYSTEM COMPLETION AT EXCEL ENERGY
Ongoing maintenance is critical to guarantee the reliability and safety of a solar pv system installation.
Our maintenance protocols comply with international standards and manufacturer recommendations for the cleaning, inspection, and servicing of all PV components. This process includes debris removal, verification of electrical connections, and the use of thermal imaging to identify hotspots or faults.
If you would like to find out more about our service or require detailed information on maintenance best practices to reduce solar PV installation risks, contact our team today!