The number of solar panels on a commercial building depends on several factors. Such as the size of the roof and the net surface area: the space actually filled with panels. This depends on the rotation of the sun, the shadows on your premises and any 'obstacles' on your premises. An example is Zonnedak Beerta Ulsderweg. Here are 1,297 panels placed, good for 223,230 kg less CO2 emissions per year.