Roofs are not meant to last forever, but some types can significantly outlast others. When it comes to installing solar panels, the kind of roof you have can make a considerable difference in the system’s longevity and efficiency. Galvanised roofs, while popular for their durability and corrosion resistance, present unique challenges when paired with solar panels.

Solar panels, designed to last around 25 – 30 years, are an appealing option for homeowners looking to harness renewable energy. However, the interaction between solar panels and the underlying roof material is important. While galvanised roofs are strong and long-lasting, they may not be the best substrate for solar panel installation.

One of the primary concerns with mounting solar panels on a galvanised roof is the potential for accelerated corrosion. Galvanised steel is coated with zinc to prevent rusting, but this protection can be compromised when certain metals are introduced. Solar panels are typically housed in metal frames made of aluminium. When aluminium and galvanised steel come into contact, especially in the presence of moisture, a galvanic reaction can occur. Over time, the corrosion of a galvanised roof can lead to several issues. Firstly, the structural integrity of the roof may be compromised, making it less capable of supporting the weight of the solar panels. This can result in leaks, structural damage, and the need for costly repairs or even a complete roof replacement. Secondly, the solar panels themselves may be affected. As the roof corrodes, it can impact the mounting system, causing the panels to become unstable or less effective.

Can you put solar panels on galvanised roofs?

Yes, you can, but there are a few things to consider before doing so.

The first option is the obvious one – You’ll need to replace your roof. So, if you’re considering a renovation project, this would be the first thing to do.  

But if you can’t change your roof completely, you can at least protect it. Using paint and spray-on membrane products with heat-reflective or waterproofing qualities, you can extend the life of your existing cladding.  If you’re considering getting solar and don’t want to replace your galvanised roof, then paint and protect it first so that you’re not trying to paint rusty steel further down the line.

Also, ensure that the mounting system and hardware used for the solar panels are made from materials compatible with galvanised steel. Stainless steel or coated hardware can reduce the risk of galvanic corrosion.

Regular maintenance of both the roof and the solar panels will also help you identify any small problems before they become big ones. And lastly, make sure you’ve hired a solar company with experience and expertise. If you have a galvanised roof and want to get solar panels, speak to them first to find out what your best options are. Do your research and make sure the company you choose can help you.

Your Solar & Electrical Experts

Established in 2020, Tropical Solar and Electrical Services is a locally owned and operated company servicing homes and businesses throughout Mackay and surrounding areas including Moranbah, Sarina, Proserpine and Rockhampton. Whether it’s power on the roof or within the property, we’ll ensure it’s running as it should. Get in touch with our electrical experts today for a free quote. We’re available 24/7 for your convenience.