Project E-Mini Bike, Using an Outrunner

[Metallover]

I just went out for a little testing. It was just going to be a short one, but it became a 20 minute joyride.

I got a battery monitor/lvc for my lipos. When I got it, I figured it wasn't really necessary. Man I love the thing!

A blue light that shines if the pack is above or at nominal.
The blue light flashes at 3.4-3.7v/cell.
A red light will shine at 3.3-3.4v per cell
A beeper and flashing red light starts if the pack goes under 3.3v/cell.

I started at solid blue (never checked voltage, but last night I was at about 4v/cell after the initial 30-minute partial .5c charge) and it was sold blue for the first couple miles. It then was blinking blue until I accelerated hard out of a turn when the beeper and flashing red light came on for a second. I just happened to be right by my house so I just 1/4 throttled it back. It went back up to flashing blue, meaning above 3.3v/cell.

I went a total of about 5.5mi, + 1.4mi last night off the same charge. That is a 7 mile range off a not even full charge and not full discharge. I bet I can get 10 miles easy.

Top speed was 20.5mph, average speed was 15.2 according to gps. I could cruise around 19 all day. I put thermal grease between the motor and the primary mount and the secondary mount(the aluminum plate with bends in it). I also added a small heatsink to the end. Temps were wonderful. I checked periodically throughout the night and they never got over 140 on the windings. It was usually a tick over 130. The case was well under 100f. The controller is cool and batteries are ice cold. I am very pleased with temperatures.

new heatsink


battery monitor. The black thing above the light is the beeper. The light is pretty dang bright and the beeper is easily audible.


My battery nest and Parallel balance harness


I also soldered a jst plug to the main parallel connector, and I have a bec plugged into that. I had problems with too much voltage goinng to the servo tester; I hope a fully charged lipo isn't too much for the 22.2v input on the bec.

I may get a video soon..