I'b building a cargo bike using an Xtracycle FreeRadical kit and want to go electric to help get them groceries home. I live in hilly mountainous terrain both in Canada and Mexico and need something torquey to get me up them hills with or without my helping. I'm thinking 500 watts with a 36 volt battery should do the trick and keep me legal.
Question; are there controllers such as the CA that can allow me to step back the voltage from a 48 volt battery to 36 to stay legal and then allow me to bump up that power setting again once I get off the main paved roads and onto the trails?
Question; Is the MPIII available with an external controller? Or, would I have to convert to an external controller and do the conversion myself if there is not a commercial version available?
Question; MPII's are loved by power junkies and seem to be bombproof as I'm led to believe when running sensorless and with external controller. Is the MPIII as good in terms of power, reliability, durability?
Question; Where does the 901 fit in here? Does it have the same torque as the MP's for hill climbing but simply a faster overall motor with no disk brake support?
I don't have disk brakes on the mountain bike to be converted to a cargo bike so support for disk brakes is meaningless to me for this bike.
Question; Last but not least, I keep being told to stay away from GM kits. Are they all crap like I'm being led to believe or only certain components within the kits. Those that are running MP's with external controllers seem happier. Whats good? Whats not?
Thanks
