Means they're free perpetual motion machines.What do they mean by "no need to charge"? It can't be serious...
I am afraid cyclist might need to pedal more to charge battery, so it opposite to pedal assist.Means they're free perpetual motion machines.
Regenerative braking sounds good charge while you rideI am afraid cyclist might need to pedal more to charge battery, so it opposite to pedal assist.
I have one of those. I put a motor in each wheel with only a tiny battery. I start pedalling and the front motor is wired as a generator to charge the battery. After a few meters, there's enough juice in the battery to work the rear motor that then propels the bike while the front motor re-charges the battery. It therefore has infinite range. It's brilliant.Means they're free perpetual motion machines.
Better still. bring your bike into your house, put it on a stand and pedal it to run your PC.I am afraid cyclist might need to pedal more to charge battery, so it opposite to pedal assist.
Regenerative braking might top up battery slightly. There is no way you can fully charge battery with that.Regenerative braking sounds good charge while you ride
You can do the sums. Say you have a typical 400wh battery, and you can pedal along at a comfortable 100w. An ebike motor is about 70% efficient and you'd lose another 10% in rectifying and converting anything generated into battery charge, so you'd need 667wh put into the motor to charge the battery. That means that you would have to do the equivalent of pedalling for 6 hrs and 40 minutes to charge the battery.Regenerative braking might top up battery slightly. There is no way you can fully charge battery with that.
...unless I am missing something.
In short it is much more effective to have road bike without "no need to charge" kit installed. As added bonus one can save 1k.You can do the sums. Say you have a typical 400wh battery, and you can pedal along at a comfortable 100w. An ebike motor is about 70% efficient and you'd lose another 10% in rectifying and converting anything generated into battery charge, so you'd need 667wh put into the motor to charge the battery. That means that you would have to do the equivalent of pedalling for 6 hrs and 40 minutes to charge the battery.
The problem is that all of your 100w would be going to propel the bike, not charge the battery. To charge the battery, you'd have to pedal harder than normal- say 50w extra (150w total), which is what a fit cyclist does on an exercise ride. You'd have to do that for 13 hours and 20 minutes if you could. I would think that there's nobody on this forum that can do that unless they divided it up into 12 one hour sessions, in which case it would take nearly two weeks to charge the battery.
Regen always sound like a good idea, but when you try a bike with it, it sucks. Some people like electronically assisted braking, which steps up the regen to give a braking force, but the downside is always a bike that's difficult to ride without power, and you lose that bit we all enjoy - freewheeling down a hill.
You'd need a fair gust to make it worthwhile, but it's not a bad idea. Do you have any more information about this specific implementation (photo, link, etc.)?I've seen one guy put vanes across the spokes on his bike for a prolonged camping trip. When he stopped, he used it as a wind generator to re-charge the battery before carrying on his journey.
No, it was about 8 years ago, probably on ES, though I do a lot of research into wind generators, so could have been anywhere. I searched, but couldn't find it. All I can remember was it was USA or Canada. Like you, I can't believe he got much out of it, but it was a very low cost installation, just the cost of some stuff to wrap around the spokes.You'd need a fair gust to make it worthwhile, but it's not a bad idea. Do you have any more information about this specific implementation (photo, link, etc.)?
No it doesn't sound good.Regenerative braking sounds good charge while you ride
Actually it sounds good. Just to good to be true.No it doesn't sound good.