With my experience in building solar bikes I decided to open a shop in Ghana, West Africa.
Main products are energie measuring devices for electric current (DC and AC), converters and cables for solar systems.
For electric bikes you need converter. So I can advice customers, which kind of converter you can take to charge a smartphone.
For the begining, I try to sell the the measuring devices.
The Consulting will contain the formula to calculate solar home systems, like stand-alone systems for energy suply.
I hope I can say wellcome to you at my shop in Ghana.