The Weight of Thermal Solar Panels Explained: What You Need to Know About Weight per Square Metre in Operational Conditions.

Thermal solar panels are important in producing renewable energy and providing efficient solutions for heating water and spaces. However, when considering their installation, one key factor that often gets overlooked is their weight. Understanding the weight of thermal solar panels is essential to ensuring that they are installed safely and effectively. 

How Thermal Solar Panels Work?

Thermal solar panels, also known as solar thermal collectors, absorb sunlight to generate heat, typically used to warm water or air for domestic, commercial, or industrial use. Unlike photovoltaic (PV) panels that convert sunlight into electricity, thermal panels focus on capturing and utilising heat. These panels are made from glass, metal, and insulation layers, all contributing to their overall weight.

Types of Thermal Solar Panels

Understanding these types helps choose the right panel based on your building’s structural capacity and energy needs. There are various thermal solar panels, each with different weight characteristics.

Flat-Plate Collectors

Flat-plate collectors are among the most common thermal solar panels used in residential and commercial applications. They consist of a flat absorber plate that captures solar energy, a transparent cover that reduces heat loss, insulation to prevent energy from escaping, and a metal casing.

Flat-plate collectors generally weigh between 20 to 30 kg per square metre. The actual weight can vary depending on the specific materials used, the glass’s thickness, and the insulation’s quality.

Evacuated Tube Collectors

Evacuated tube collectors are another popular type of thermal solar panel, especially in colder climates where heat retention is crucial. These panels contain rows of glass tubes, each with a vacuum inside to minimise heat loss.

Evacuated tube collectors typically weigh between 10 and 20 kg per square metre, which makes them lighter than flat-plate collectors. However, the total weight depends on the number of tubes and the volume of fluid they contain.

Integral Collector-Storage Systems

Integral collector-storage (ICS) systems are designed to collect solar energy and store heated water in the same unit. Due to the combined function of heat collection and water storage, these systems are heavier.

Depending on the amount of water stored and the materials used in the construction, ICS systems can weigh 30 to 50 kg per square metre.

Mounting Systems

Mounting systems are an essential part of any solar panel installation. They ensure that the panels are securely attached to the roof or structure and can withstand environmental factors such as wind and snow.

Mounting systems generally add an additional 5 to 10 kg per square metre to the total weight, depending on the complexity and materials used.

Weight Considerations in Operational Conditions

Weight per Square Metre

Weight per square metre is a critical measurement that defines the load a thermal solar panel imposes on a surface area of the building’s roof or structure. This metric is vital for calculating whether a building can support the panels without compromising structural integrity. A higher weight per square metre requires a more robust and load-bearing structure.

Factors Affecting Weight in Operational Conditions

Several factors influence the actual weight of thermal solar panels when in operation:

• Fluid Content: Fluids (like water or glycol) within the panels add to their operational weight.
• Insulation Materials: The type and thickness of insulation used in the panels can increase the weight.
• Mounting Systems: The brackets and frames that secure the panels add weight, which must be factored into the overall load.
• Thermal Expansion: Temperature changes cause materials to expand and contract, which can subtly affect the weight and stress on the mounting systems over time.

Practical Implications for Installation

Structural Integrity and Load-Bearing Capacity

Before installing thermal solar panels, it is crucial to assess the load-bearing capacity of the roof or structure. An expert evaluation can determine if the current structure can handle the added weight or if reinforcements are necessary. This assessment should consider not only the weight of the panels but also the dynamic loads from wind, snow, and thermal expansion.

Building Regulations and Compliance

In the UK, building regulations require that any solar panel installation must not exceed the structural load capacity of the building. Compliance with these regulations is critical to avoid potential safety hazards. Ensuring that the installation meets local building codes will help prevent structural failures and legal issues.

Expert Tips for Managing Thermal Solar Panel Weight

Choosing the Right Panels for Your Building

Selecting the appropriate type of thermal solar panel is crucial. Evacuated tube collectors, due to their lighter weight, might be a better option for buildings with limited load-bearing capacity. Flat-plate collectors, offering higher durability and efficiency, can be considered for structures with more robust roofs.

Installation Best Practices

To minimise the impact of weight on your building, consider these best practices:

• Professional Assessment: Always consult a structural engineer before installation to ensure the building can handle the additional load.
• Proper Mounting: Use high-quality mounting systems that distribute the weight evenly across the structure.
• Regular Maintenance: Periodically check the panels and mounting systems to ensure they are secure and functioning properly, especially after extreme weather conditions.

Ensuring a Safe and Effective Thermal Solar Installation

Understanding the weight of thermal solar panels and how it affects your building is crucial for a successful installation. By considering factors such as weight per square metre and the structural integrity of your building, you can make informed decisions that ensure both safety and efficiency. Proper planning, compliance with building regulations, and choosing the right panels will help you reap the benefits of thermal solar energy without compromising your property’s structural integrity.

Take the Next Step Today! Consult with EvoEnergy for Your Solar Needs

If you’re considering installing thermal solar panels, contact EvoEnergy today for a consultation. Our experts can help you assess your building’s load-bearing capacity and recommend the best solar solutions tailored to your needs. Let us help you maximise the sun’s power safely and efficiently.