Commercial Solar Panels and Poor Weather: What You Need to Know

Investing in commercial solar panels is a significant step towards reducing energy costs and promoting sustainability. However, one common concern is their performance during poor weather conditions. Here, we address the impact of various weather scenarios on solar panel efficiency and how to optimise their performance year-round.

Impact of Different Weather Conditions

  1. Cloudy Days:
    • Performance: Solar panels can still generate electricity on cloudy days, but their efficiency drops. They typically produce 10-25% of their normal output during overcast conditions.
    • Technology: Panels with higher efficiency, such as monocrystalline, perform better in low-light conditions compared to polycrystalline panels.
  2. Rain:
    • Performance: Rain itself does not significantly hinder solar energy production. In fact, it can be beneficial as it helps clean the panels, removing dust and dirt that might block sunlight.
    • Maintenance: Regular cleaning ensures maximum efficiency, and rain can reduce the frequency of manual cleanings.
  3. Snow:
    • Performance: Heavy snowfall can block sunlight, reducing or halting electricity production until the snow melts or is removed.
    • Design Solutions: Installing panels at an angle helps snow slide off. Some systems incorporate heating elements to melt snow.
  4. Cold Temperatures:
    • Performance: Solar panels can perform well in cold temperatures. In fact, they operate more efficiently in cooler weather because excessive heat can reduce their efficiency.
    • Consideration: Ensure panels are designed to withstand local temperature extremes.
  5. Wind:
    • Structural Integrity: High winds can damage solar panels if they are not properly secured. Ensuring robust mounting and using durable materials is crucial.
    • Efficiency: Wind does not directly affect the efficiency of the panels but can influence the structural aspects.

Tips for Maximising Solar Panel Efficiency in Poor Weather

  1. Quality Installation:
    • Engage experienced professionals to ensure panels are correctly installed and oriented to maximise exposure to sunlight, even in less-than-ideal conditions.
  2. Regular Maintenance:
    • Routine inspections and maintenance help identify and rectify issues such as debris accumulation, shading, and damage from weather events.
  3. Advanced Technologies:
    • Invest in high-efficiency panels and consider hybrid systems that can integrate other energy sources, such as wind or battery storage, to ensure a steady power supply.
  4. Monitoring Systems:
    • Use real-time monitoring systems to track performance and quickly address any dips in energy production due to weather conditions.
  5. Weather Forecast Integration:
    • Utilise weather forecasting tools to predict and prepare for periods of low solar output. This can involve adjusting energy consumption patterns or switching to backup power sources.


While poor weather can affect the efficiency of commercial solar panels, understanding these impacts and taking proactive steps can mitigate their effects. Proper installation, regular maintenance, and leveraging advanced technologies can ensure that your solar energy system remains a reliable and cost-effective energy solution throughout the year.

Why Use NSI Projects?

NSI Projects have over 40 years of experience in delivering great projects for commercial buildings. We partner with leading suppliers and experts to design, procure and install practical and cost effective solutions for our customers.


Call our experts today on 0800 027 1966.

Huboo warehouse exterior


More Good stored inside due to a new mezzanine floor


The team at NSI Projects provided a complete design and build service to Huboo for this project, taking time to understand our requirements and turning the design into reality. They provided trusted advice and safe project management, allowing us to get on with our daily operations knowing that the installation was under control.

Billy Ansell - Facilities Manager
Industrial pallet racking systems

Ribble Technologies.

We received top notch service from Alex Gallagher and the team with the install of our racking, couldn't recommend NSI enough! Nothing was too much trouble, amazing customer and installation service from start to finish.

Emma Cook - Office Manager
Bulk Powders automated pallet racking system

Bulk Powders.

On behalf of Bulk Powders, NSI Projects designed, procured and managed the installation of the automated pallet shuttle system from start to completion, the site was managed so that the installation and ongoing operations could exist side by side.

Guy Martin - Project Consultant

DHL Stirling Park large racking project

DHL Stirling Park.

I wanted to take a moment to express my sincere gratitude for the outstanding job your team did on our recent warehouse project. The changes and installation of the new racking was executed flawlessly and within budget, which is a testament to your team’s expertise and professionalism. Their attention to detail, commitment to quality workmanship, and ability to keep everything on track were truly impressive. They went above and beyond in ensuring that all aspects of the project were completed satisfactorily.

Andrius Cekanauskas - Senior Planning Manager DHL Manufacturing Logistics
Euro Options server room created with dividing walls

Euro Options.

We love the job NSI Projects have done, they worked efficiently and completed the job above our expectations.

Ian Tait - Commercial Manager Euro Options
Arial shot of a warehouse with soalr panels installed

John Scott Works.

A big thank you to NSI Projects for providing us with a quick and quality service.

Matthijis Schot - CEO PRN Group