Hi, what does 750w max instantaneous power actually mean compared to the 250w nominal. How, when, and for how long would I feel the extra Watts?
Thanks
J
Thanks
J
shopping list please!
- Thread starter Stephenmacleod
- Start date
You will notice the extra watts (up to 750w ) on inclines in assist level 5 or with a throttle, it will be pretty effortless. Controller is 20a rated x 48v nom voltage gives 960w total out put but by the time you factor in wiring/hub efficiency the power at the hub wheel is actually about 750/760 watts which is a mega healthy boost if needed, or about twice the watts a TDF or pro rider outputs and they are the elite.
The 750w though isn't a continuous power rating but a temporary one typically for 20/30 sec burst of power, though in most cases you could get a way with a little longer but not continuously as power will add heat and could cause hub damage to the nylon gears. The nominal 250w is the rating it will run at all day long which is typically in PAS1, 2 or 3 depending on the controllers current settings.
The 750w though isn't a continuous power rating but a temporary one typically for 20/30 sec burst of power, though in most cases you could get a way with a little longer but not continuously as power will add heat and could cause hub damage to the nylon gears. The nominal 250w is the rating it will run at all day long which is typically in PAS1, 2 or 3 depending on the controllers current settings.
Last edited:
You would feel it most going up a not too steep hill, and maybe acceleration.
(I think, but others may correct that.)
On the flat it should cut out at at 15.5mph, where you wouldn't use the power.
On a steep hill you could not keep going fast enough for the motor to generate its full power.
I'm not sure how long a motor can keep generating that sort of power without overheating.
The battery may well not like trying to output that sort of power either.
You can get some idea of how motor power/speed/efficiency works from https://www.ebikes.ca/tools/simulator.html
but it is sadly missing many modern motors.
(I think, but others may correct that.)
On the flat it should cut out at at 15.5mph, where you wouldn't use the power.
On a steep hill you could not keep going fast enough for the motor to generate its full power.
I'm not sure how long a motor can keep generating that sort of power without overheating.
The battery may well not like trying to output that sort of power either.
You can get some idea of how motor power/speed/efficiency works from https://www.ebikes.ca/tools/simulator.html
but it is sadly missing many modern motors.
On inclines esp steeper ones as mentioned you won't get max speed unless you are a TDF rider and your cadence is over 90/100 rpm but what you will get is max power at a lower speed and torque.
Hi,
What is the no load rpm of the Shengyi DWG22 motor? is it more silent than Swx02 motor?
36V 17Ah battery stores 612 Watt/hours of energy
48V 12Ah battery stores 576 Watt/hours of energy
So the 36V 17Ah does have the edge, but not by a significant amount - you would get about the same mileage from either.
Hi Boris,
very similar to your 48V SWX02 but a little quieter.
The main thing is it has a freehub body for cassettes.
It has the same winding but I forgot to check on the test bike, now I have run out of batteries until 15-July so I can't confirm the noload speed to you until the new shipment arrives.
May be selling components would be another feather in the cap esp selling lower wound/rpm high torque hubs that one can't buy below the 201rpm models.
I would need more manpower and storage space.
Are you offering your services for kit advice and support?
Are you offering your services for kit advice and support?
Related Articles
-
Swytch announce new conversion kit with ‘pocket-sized’ battery- Started by: Pedelecs
-
New Swytch launches on Indiegogo, raises £100k in first hour- Started by: Pedelecs
-
Swytch to unveil 70% smaller, 50% lighter conversion kit- Started by: Pedelecs