The cost of solar panels for a business varies greatly. They depend on the type of panel chosen, the quantity of panels purchased and the lot from which they are purchased. There are three types of panels:

• Monocrystalline solar panels: they have the highest efficiency, but they are also the most expensive.
• Polycrystalline solar panels: the difference in efficiency between polycrystalline and monocrystalline solar panels runs to several percent.
• Amorphous solar panels: this type of solar panel is the cheapest due to low production costs, but also has the lowest efficiency.

Efficiency versus yield is thus an important consideration for a solar roof. The final choice and cost are therefore different for each project.