Building a new electric assist bike
I don't often hang out here with the electrified crowd, but I'm currently working on a project that I would appreciate some feedback on.
About 5 years ago, I did a Wilderness energy electric conversion for my wife. At the time, I bought two kits, thinking I'd sell one in my shop.
It never sold however, so I still have it.
Anyway, the bike I converted for her is a 700c wheel bike, and although the motor has worked beautifully with no issues whatsoever, she is now finding the bike to be very cumbersome.
I decided to dig out the spare kit, and build her a new bike from the ground up, this time, a 26" wheel bike with slacker frame angles, and an internal gearhub drivetrain.
I'm documenting the build as I go on Youtube, here's what I've done so far.
OK, here's where I'm wading out of my depth.
As I explained in one of the earlier videos, I am discarding the brake lever with the kill switch built in, and wiring a separate kill switch on the handlebars. The reason being, the lever is junk, but it does seem a good idea to to be able to cut the power in case it stuck on.
I was simply going to wire an on off switch in place of the lever, but was surprised to learn that pulling the lever actually closes the circuit rather than opening it. This means that the safety overide actually relies on a power supply rather than cutting power. Hardly seems fail safe to me.
So, I went with the original plan, and connected the cable to bypass the key switch instead as I had done on the earlier conversion.
Is it common to have safety overides that function by supplying power, and if so, why?