In the large majority of cases solar for business is financially attractive because of the return on investment ROI is faster than a domestic installation.
People go work when the sun comes up and use their own generated energy. When they leave work at the end of the day when the sun goes down, the generation stops. ROI investment can be as little as 3 years with the solar array having atlas a 20 year life span.
Also, from a business conscience point of view, many businesses are increasingly looking to reduce their carbon footprint and increase the green credentials / sustainability within their organisation.