Freddyflatfoot wrote:Hope these comments are of some assistance to you.
I really appreciate your comments, thanks.
Current limiting is something I'm looking into. I currently have a stand alone CA and can't limit current with it. I've bought a second hand plug in CA however and plan to solder on a connector on my ecrazyman controller when knuckles gets the instructions to me.
Another option is a controller suitable for use with just 1 battery pack (36v nominal) or two in parallel. My controller can't go below 40v so it's not an option.
One metal gear, or all composite gears are options I'm looking at. Even with current limiting, I'm not convinced at the long term reliability of the nylon gears. If you've seen them in person I think you'll agree they don't look capable of handling much torque at all.
My motor is a 36v version for a 26" wheel.
On my second outing, I managed nearly 6km before stripping the gears. The peak amps were only 17.75A and for the most part current was kept under 10A.
On the legal issue, firstly I think that the electric power assisted law as defined, is irrational. Especially the "peak" vs "continuous" issue. I would like to see the law promoting safe ebikes that can provide REAL assistance. However, I am interested in operating the bike as legally as possible, even with the present restrictive and unreasonable policy.
I enjoy cycling and do a variety of riding from commuting, shopping, weekend spandex-clad road riding, and a bit of MTBing.
My on-road ebike goals are:
* A bike that enables me to commute faster then pedal power alone and with less sweating. My commute to work is ~13km each way. On my last unassisted commute (on a singlespeed drop handlebar roadbike), my average speed was 21 km/hr with a max speed of 43 km/hr. It took me ~38min.
* A bike that I can load up with groceries and still pedal around the hilly area I live in. I plan to have a front and rear rack (not filled with any ebike components) ready to aid in shopping, moving things around, and generally replace car trips.
My ultimate aim is to exceed my current un-assisted performance. If I could average 30 km/hr with a similar max speed and arrive at work less sweaty I'd be quite happy. Doing so would provide me an 'assist' of ~10 km/h over my un-assisted average speed. I don't see this as trying to operate an electric motorbike in secret. When I ride my road bike at 55km+ no one bats an eye. On the other end of the spectrum I've seen those crap electric vespa type scooters with pedals riding with traffic moving at 15 km/hr and holding everyone up. To my mind they are the real legal concern.
Thanks for checking in with your comments. When I get my plug in CA working, and can use it to limit current I'll try setting it at 2.5A which would make the bike 200w peak compliant. I'd be curious what assistance it could actually provide. I imagine 8-10a would be much more reasonable, as you say.