I have both a cargo bike and a recumbent bike running self installed electric for many years now, and have several friends running various motors on recumbents. Post a picture or name and model of bike here and I can give you some knowledgeable advice.
Info mainly need is rim diameter, number of speeds in geartrain, 2 or 3 wheeler (if 3 wheels is it single or dual front wheel)and is bike going to be for distance riding with mild to moderate hills or steep hill riding. I can offer you some good charging solutions depending on your battery/solar/generator setup.