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Bionx 48 volt system

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Bionx 48 volt system

11-30-10, 10:35 PM
#1
15rms
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Bionx 48 volt system

I see Bionx is going to be selling a 48 volt 350 watt kit starting in Feb. For those that understand this better than I, I have a question. Would the 48 volt battery hold 33% more energy than a 36 volt battery? And assuming so would you expect the bike to go 33% further on a charge or would the extra power and acceleration eat up the benifit?

https://www.greenspeed.us/bionx_PL350...l_edition.html
12-01-10, 10:15 AM
#2
Sangesf
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It doesn't say the AH of the battery.

Here is the calculations you need...

Volts times Amp Hours = Watt/Hours
More volts = more speed.
More AHs = more distance.
Wattage of motor = Pulling Power (torque)

So everything hinges on those calc...

Example....
36v 10ah = 360 w/h
36v 20ah = 720 w/h = more distance
48v 10ah = 480 w/h (compared to 36v 10ah) = more speed and distance
48v 20ah = 960 w/h (compared to 48v 10ah) = more distance.

Given equal batteries(lets say 36v 20ah), a 250w motor will use up all the battery in ~3 hrs. (720wh / 250w)
A 500 watt motor will give much better torque, but can use up twice as much power as the 250w one will. (720wh / 500w)

Given different voltages, it gets a little trickier...
A 36v 20ah running a 250w motor = a little less than 3 hours. (see above calc)
A 48v 20ah running a 250w motor = more speed and a little less than FOUR hours. (960wh \ 250w)
You'll notice the batteries have the same "AH" but you'll see that the 48v will give you more speed and distance.
A 48v 20ah running a 500w motor = even more speed, more torque, and less time (960wh / 500w = a little less than TWO hours.

Hope this helps.
12-01-10, 10:26 AM
#3
15rms
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Thanks Sangesf.

Last edited by 15rms; 12-01-10 at 11:24 AM.
12-01-10, 11:29 PM
#4
edcastrovalley
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Given different voltages, it gets a little trickier...
A 36v 20ah running a 250w motor = a little less than 3 hours. (see above calc)
My 500w hub motor kit came with a 36v10ah battery and was advertised to go 20 miles on a charge with a top speed of 20mph. But 360 watt-hours (batt) / 500 watts (hub motor) = 0.72 hours and 0.72 hours x 20mph = 14.4 miles! (My maximum range on a charge) Did I calculate right or did I get taken for a ride?
12-02-10, 11:03 AM
#5
Mabman
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The fly in the ointment is the fact that batteries should not be drawn down fully before recharging so count on less ah than advertised.

12-02-10, 11:30 PM
#6
Sangesf
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Originally Posted by edcastrovalley
My 500w hub motor kit came with a 36v10ah battery and was advertised to go 20 miles on a charge with a top speed of 20mph. But 360 watt-hours (batt) / 500 watts (hub motor) = 0.72 hours and 0.72 hours x 20mph = 14.4 miles! (My maximum range on a charge) Did I calculate right or did I get taken for a ride?
Well 20 miles on 10ah is a bit optimistic.

On 36v I average 7 miles for every 5ah. (at 22mph)
(LiFePo4)
12-07-10, 08:53 PM
#7
edcastrovalley
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Originally Posted by Sangesf
Well 20 miles on 10ah is a bit optimistic.

On 36v I average 7 miles for every 5ah. (at 22mph)
(LiFePo4)
7 miles for 5 ah sounds good! (especially at 22mph) On my longest ride I went 16 miles total without any signs of slowing down. I'm good with that.
12-23-10, 06:15 AM
#8
GTALuigi
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hmm... very informative.

I just learned something new today

Thanks!

Originally Posted by Sangesf
It doesn't say the AH of the battery.

Here is the calculations you need...

Volts times Amp Hours = Watt/Hours
More volts = more speed.
More AHs = more distance.
Wattage of motor = Pulling Power (torque)

So everything hinges on those calc...

Example....
36v 10ah = 360 w/h
36v 20ah = 720 w/h = more distance
48v 10ah = 480 w/h (compared to 36v 10ah) = more speed and distance
48v 20ah = 960 w/h (compared to 48v 10ah) = more distance.

Given equal batteries(lets say 36v 20ah), a 250w motor will use up all the battery in ~3 hrs. (720wh / 250w)
A 500 watt motor will give much better torque, but can use up twice as much power as the 250w one will. (720wh / 500w)

Given different voltages, it gets a little trickier...
A 36v 20ah running a 250w motor = a little less than 3 hours. (see above calc)
A 48v 20ah running a 250w motor = more speed and a little less than FOUR hours. (960wh \ 250w)
You'll notice the batteries have the same "AH" but you'll see that the 48v will give you more speed and distance.
A 48v 20ah running a 500w motor = even more speed, more torque, and less time (960wh / 500w = a little less than TWO hours.

Hope this helps.
12-23-10, 08:19 AM
#9
Sangesf
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Always glad to help... Any more questions?
12-25-10, 09:21 AM
#10
On Training Wheels

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Who builds the best controller and motors? What makes one motor better than another? What do you see as the ideal combination of power Motor(W) and Battery V/A? Seems people forget that as you increase both, you also increase weight and balance on the bike. That much I know, but I am a newbie here.
12-25-10, 07:03 PM
#11
Sangesf
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I always like to use 250w-350w motors because I don't need speed or power..
I always like as much distance..
I'm in south florida so it's all flat around here. If you live in a slightly hilly area, go with 500-750w motors.
If you live in very hilly areas, then an 800w+ motor is for you.

Just about any motor will do for me because I only run 250w-350w continuous and most motors handle that easily.
36v IMO is the best for price per weight.
Smaller wheels provide more torque and more speed compared to larger wheels...

I use Goldenmotor controllers, they run voltages 24-60v and when used with 24/36v they only pull 25a max. They have regen, cruise control, reverse, programable, alarm, horn, etc, etc all in one controller
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