Took it out for a 6 mile test ride yesterday. All went fine. Average speed 17mph, a few gentle hills. Didn't notice any heat from the motor or controller.
Battery voltage was sagging to 42v under load at the end.
Charged the batteries up to full, reading about 52v. Motor seemed dead, throttle did nothing. Back wheel was still turning at one turn per second when I turn the ignition key to on. I had to get my normal bike out, which felt awful
Came back to it later, took the cover off the controller and started testing things with a multimeter. All of a sudden the motor seemed to come back to life just as I was testing the throttle voltage on the controller. Shortly after that, noticed the controller was getting *very* hot. So hot I could only touch it for about 3 seconds. I wonder if it suddenly started working when the input voltage had dropped off a bit. When I tested it yesterday the batteries were probably only about half charged.
Maybe I need to replace the controller. What do people think? I know Samd has already suggested this.
Something like this one: http://www.ebay.co.uk/itm/Electric-Scoo ... 0590002122
350 watts might not be enough?
This one better? http://www.tncscooters.com/YK40-4.php
Any advice appreciated