Some roof materials are more suitable for solar panel installation than others. Fortunately, asphalt shingles, the most common roofing material, are ideal for solar panels. Additionally, corrugated metal, standing seam, clay tile, and rubber roofs also make for easy installation. Roofs made of slate or wood shingles are more difficult for installation, however, not impossible.1 There are special mounting components and equipment elements that make it possible to install an array on almost any roof— let our contracting partners find the best mounting solution for your roof!
Solar panels need a certain amount of space to be properly installed – average size systems 3 – 6 kW requires approx. 16 – 35 m2 of free roof space. A large rectangular roof—free of any vents or chimneys—is ideal for solar installation, but few homes have such an arrangement. Fortunately, most professional installers are familiar with a variety of roof configurations, and therefore can work around skylights or chimneys.1
Solar panels have a long life-cycle, up to twenty-five years, and most will keep working adequately for even longer. However, it is important to make sure your roof is in good condition at the time of installation. If your roof is due for maintenance or an upgrade, it is best to do that before installing a solar system.
However, it is possible to replace your roof after you’ve had solar panels installed, but you’ll incur the added expense of uninstalling and then reinstalling the array. It is important to note that if you have 10 to 15 years left in the lifespan of your roof, you’re in good shape to add a solar installation—otherwise, upgrade the roof before the panels.
Solar panels are most effective when they face true south. You can easily find out what direction your roof faces by looking at your house on Google Maps. The solar panels don’t not have to face true south to have a good energy output. For instance, it is still possible to get good energy output from panels that are facing southeast, southwest, or even east and west. As a rule of thumb, southeast and southwest have – 7% less output than south facing solar panels and east and west – 25 %. Note that north, northwest and northeast are not suitable directions for solar panels.
Roof angles between 300 – 50o allows the best output for solar panels in Sweden, but any angle above 15o is also adequate2. The angle of the roof is more marginal for the output compared to the direction that the roof is facing.
After registering on GRØNBID, it is possible to add all the mentioned criteria, and our installers will find a suitable solar panel solution for you. Furthermore, you will receive the calculations of the electricity output and payback time for your investment.