JennyB
1 kW
I'm talking about mid-day charging for long-distance touring.
At present I can get two hours extra runtime from one hour charge. Ping 36v 15ah battery, 5 amp charger plus a 2.5 amp charging through the main leads - about 300 watts.Take it into a cafe and recharge while you eat, then ride 15 mph average speed at 10 watt hours per mile. This works for me because if the country is interesting I don't want to do more than 100 miles in a day anyway, which I can do comfortably with two charging stops. If I wanted to I could perhaps start with a drained battery, keep travelling through the night, and manage 240 miles in 24 hours. 8)
It seems that the existing electrical supply infrastructure is a pretty good fit for ebikes. Removing the battery gives you a lot more charging opportunities. My current setup fits in a flight bag and weighs about 8 kg. That allows me to carry a decent amount of other luggage and still have a bike I would care to pedal if the worst happened.
Given those limitations, how much faster could I go?
Travelling for two hours at 15 mph and charging for one gives me an effective speed of 10 mph. It seems that ratio is about optimal: if I were to use power at twice the rate I would need to travel at 20 mph for the same effective speed (not counting time lost in finding extra charging points). If I were to stretch to three hours I could travel at 13.3 mph, but would only have 100 watts average to do it with.
That seems to hold for any power of charger, or at least any charger that can use an ordinary 240 volt socket without blowing it. For the fastest effective speed, use energy at half the rate you put it in. Thirty to 40 miles is a reasonable distance between charge points and 20 mph is probably the highest speed I would want to average.
800+ wh battery and 600+ watt charger in under 8 kg?
Possible? :?
At present I can get two hours extra runtime from one hour charge. Ping 36v 15ah battery, 5 amp charger plus a 2.5 amp charging through the main leads - about 300 watts.Take it into a cafe and recharge while you eat, then ride 15 mph average speed at 10 watt hours per mile. This works for me because if the country is interesting I don't want to do more than 100 miles in a day anyway, which I can do comfortably with two charging stops. If I wanted to I could perhaps start with a drained battery, keep travelling through the night, and manage 240 miles in 24 hours. 8)
It seems that the existing electrical supply infrastructure is a pretty good fit for ebikes. Removing the battery gives you a lot more charging opportunities. My current setup fits in a flight bag and weighs about 8 kg. That allows me to carry a decent amount of other luggage and still have a bike I would care to pedal if the worst happened.
Given those limitations, how much faster could I go?
Travelling for two hours at 15 mph and charging for one gives me an effective speed of 10 mph. It seems that ratio is about optimal: if I were to use power at twice the rate I would need to travel at 20 mph for the same effective speed (not counting time lost in finding extra charging points). If I were to stretch to three hours I could travel at 13.3 mph, but would only have 100 watts average to do it with.
That seems to hold for any power of charger, or at least any charger that can use an ordinary 240 volt socket without blowing it. For the fastest effective speed, use energy at half the rate you put it in. Thirty to 40 miles is a reasonable distance between charge points and 20 mph is probably the highest speed I would want to average.
800+ wh battery and 600+ watt charger in under 8 kg?
Possible? :?
