I have been working on some projects, I build a glass grinder, faceter with a 120v induction AC motor. Its not possible to effectively change the speeds with electronic controls being a single phase motor. It is using belts and pulleys for now. So I am wanting to build several tools, rock saw,belt sander,wood lathe with a variable speed. Also rig up my trike for electric power that has the potential to be charged with solar panels. looking for 0.5HP-2.5HP max. What voltage motor and controllers would be the sweet spot so I can use the same motor and control on all my tools and contraptions so I can keep some continuity of component?. making the parts all interchangeable so I dont have a mix . A voltage I could swap power from a solar or grid for direct power or run on battery power. I find the right motors and controls I will buy 6 or so to make my projects and have spare parts. This is my bike I would like to turn into a solar charged electric/pedal bike.