Most effecient business model ?

gpt

Hi, I'm new to the forum and am learning quite a bit about the solar industry. I had a question about design and installation companies most effecient business model. Ideally, a licensed electrician with roofing experience that was NABCEP certified and willing to do everything from marketing to preventative maintenance would be wonderful. Short of that, what is the typical business model as far as the team goes? Thanks