Hi all, Chas and Link,
The trike was a success but it was too slow and had very little suspension. So now I'm on to my next electric project. A street legal electric dirt bike based on a 1985 Honda CR250 rolling chassis. The EleCtRic 250! To start the bike project I scavaged some of the parts from my electric trike. I'm using the two 24V/22A/2600RPM motors and the two 12V/125AH batteries from the trike. I first tried to use the 24V/30A controller like on the trike but it wouldn't work. When the 25-1/2" diameter rear dirt bike wheel and a 144 link #520 chain (versus the trike's little 10" wheels and 2' #25 chain) is off the ground with no drag, everything was doing what it supposed to do.
But on the ground the bike wouldn't move at all. Even when I ran beside it pushing it and applying full throttle the bike wouldn't sustain movement on its own. The huge rear drive wheel was just too much for the small scooter controller. I needed more amp availabilty. So I removed the 30A controller and wired the motors through a 50A switch to the batteries. That made a big difference. Lots more power/torque without the amp limiting controller. I can walk beside it flicking the switch on and off so it wouldn't move to fast.
Now I have a new problem... Without the controller to limit the amps the wires are getting too hot just from walking beside it as it moves slowly under its own power. I haven't tried to ride it because I'm sure the wires would melt. I going to solve the wire problem and try to ride it. But then I will most likely fry the little motors, if I dont limit the amps they can draw from the 125AH batteries.
Any idea on what size controller I should move up to? 50A? 100A for this bike?
And, I thinking of a single 4 to 8HP motor next?