Understanding the key factors that impact solar generation #
The best places to install solar panels depends on several factors, that influence the feasibility, cost, and efficiency of a solar PV installation. This guide will walk you through the key considerations, helping you understand what to look for and what we assess when designing a solar solution for your business.
How sun position affects energy output #
One of the first things to consider is the orientation of your roof or installation site. In the UK, south-facing surfaces capture the most sunlight, maximising energy production. But don’t worry if your roof isn’t perfectly aligned, solar panels can still generate significant energy with east-west configurations, albeit at slightly reduced efficiency.
How geographical location affects solar panel efficiency #
The UK might not be well-known for it’s endless sunshine, but it’s still well-suited for solar power. Your exact location plays a role, with the south generally receiving more sunlight than the north. However, the difference is marginal, with the south receiving around 10-15% more solar irradiance annually than the north. Despite this, businesses across the country can still benefit from solar installations, as modern panel technology ensures efficient energy generation even in less sunny regions. Coastal areas may experience slight performance benefits due to increased wind exposure, which can help with passive cooling. However, other factors, such as humidity, salt exposure, and regional weather patterns, can also influence panel efficiency and longevity.
Solar panel mounting systems: understanding roof types & installation #
When it comes to mounting solar panels, the type of roof you have determines the installation approach. We typically categorize roofs into three main types: pitched, flat, and ground-mounted systems. Here’s what you need to know:
Pitched roofs #
Around 70% of our installations fall into this category; however, typically, it also has the most variations, all of which can impact the complexity of installation and, in turn, cost and time to complete. The roof mounting typically creates circa 20-30% of the final price, so its impact is minor.
Metal Trapezoidal
Simple and cost-effective, these roofs allow for straightforward installations using rail-based or rail-less systems.
Metal Corrugated
Requires specialised clamps and mounting hardware, sometimes needing a bespoke solution.
Metal Standing Seam
More complex due to the need for careful tile replacement and refinishing. In-roof systems or solar tiles may be preferable for aesthetic reasons.
Slate & Tile
More complex due to the need for careful tile replacement and refinishing. In-roof systems or solar tiles may be preferable for aesthetic reasons.
Asbestos (Cement Fibre)
Asbestos roofs require extra care. Options range from over-cladding (to avoid disturbing the material) to specialist non-penetrative mounting techniques.
Other
Occasionally, we encounter unique roofing materials. In these cases, we develop custom mounting solutions tailored to the building’s needs.
Flat roofs #
Flat roofs offer more flexibility in panel positioning, allowing for optimal angles to capture sunlight. However, they require additional equipment and spacing considerations:
Glass Reinforced Plastic (GRP)
Best suited to non-penetrative, ballasted, or adhesive-based mounting systems to maintain waterproofing.
Bitumen, Felt & Asphalt
Similar to GRP, ballasted mounting systems are preferred to avoid damage.
EDPM & Membranes
Non-penetrative solutions like ballasted or adhesive-fixed mounts ensure the roof remains intact.
How roof condition affects solar panel installation #
A well-maintained roof is essential for a successful solar installation. Before we proceed, we conduct a thorough roof inspection to assess structural integrity, load capacity, shading, and potential obstructions. This proactive approach helps ensure a smooth installation and a system that performs optimally for years to come.
Roof height & accessibility #
The height of your building can impact both installation logistics and panel performance. Here’s how:
Solar Irradiance
Higher-mounted panels receive more sunlight due to reduced atmospheric interference, improving output.
Temperature
Elevated panels benefit from increased airflow, which helps maintain efficiency.
Wind Exposure
Higher installations may require additional structural support to withstand wind load
Roof Access
If roof access is limited, we work with you to find the best approach, whether that means scaffolding, cranes, or other solutions.
Health and Safety
Our teams undertake all necessary risk assessments and implement appropriate working practices to prevent falls and other accidents.
Edge Protection and Man-Safe Systems
Solutions we can provide include edge protection, such as guardrails and barriers. Man-safe systems, including lifelines, anchor points, and harnesses, provide additional protection by allowing workers to attach themselves to the roof structure while performing tasks safely.
Solar PV planning permission #
For most commercial buildings, solar panel installations don’t require planning permission, thanks to regulatory changes encouraging renewable energy adoption. However, regulations can vary depending on local authorities, building type, and specific site conditions, so it’s always best to check the latest requirements to ensure compliance. However, there are exceptions:
Grid Capacity Checks: We apply to your local District Network Operator (DNO) to ensure grid compatibility, a process that typically takes up to 90 days but can vary depending on demand and location.
Listed Buildings or Leased Properties: If your business operates from a listed building or a leased space, additional permissions may be required from local councils or landlords.
Making solar simple #
At Green Shield Group, we specialise in making solar work for businesses, handling everything from initial feasibility assessments to installation and ongoing maintenance. Our goal is to help you navigate the complexities of solar with clear insights and practical solutions, ensuring you get the best possible return on your investment.
