The amount of space you have in your roof is an essential criterion in deciding the final solar system design for your commercial property. It all depends on the size of the system you need. One panel can be about 1.70 metres x 1.00 metre. Therefore, you get about 1.7 square metres for each solar panel installed on the roof. It also means you need at least the same dimensions for the roof of your building.
However, you cannot simply place the number of panels that the roof can accommodate. It is essential to consider the wattage output (W) of each panel, which can be anywhere from 250W to 360W for the best efficiency.
To serve as your guide, we recommend that you have four commercial solar panels with 250W capacity or three 330W for every one-kilowatt system. Therefore, if you wish to have a 13.2 kW system, you will need to install 40 to 55 solar panels. These smart commercial solar panels need about 68 to 93.5 square metres of roof space. In contrast, residential properties often require 15 to 20 solar panels, which can take up to 34 square metres of roof space.
If roofing dimensions seem to be an issue, our experts will find a workaround. Typically, if the solar panels have high efficiency, you can go for the lower required number of panels.