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Author Topic: e-bike kit advice  (Read 29217 times)
asorton
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« on: October 09, 2012, 11:18:06 PM »


I want to buy an e-bike kit to fit to my mountain bike, think i'm going to go for a rear wheel drive but after that im at a loss and need some advice from the experts, I have read all the e-bike threads & learnt a bit but still need help.

Do I stick to 250W and stay legal or do I "up-it" a bit to maybe 500W, will I regret sticking at 250W.

If I stick to 250w I then have a choice of 24v 36v or 48v? This is where i'm at the biggest loss as I dont understand what the difference is the LiFePo4 batteries increat a bit with voltage but not that much.

the table shows the higher voltage give more speed but does that mean less range?

table & my choices:

24V 250W 24km/h 17A
24V 350W 22km/h 28A
24V 500W 22km/h 30A
36V 250W 38km/h 15A
36V 350W 38km/h 27A
36V 500W 38km/h 28A
36V 700W 31km/h 30A
36V 800W 31km/h 32A
48V 250W 49km/h 15A
48V 350W 49km/h 15A
48V 500W 50km/h 25A
48V 700W 43km/h 28A
48V 800W 43km/h 30A
48V 1000W 60km/h 42A

for usage its leisure not work certainly into town, only a few miles but if it works out the occational 10 mile each way trip.
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knighty
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« Reply #1 on: October 10, 2012, 12:38:30 AM »

check out this thread : http://www.navitron.org.uk/forum/index.php/topic,18208.0.html

and this forum http://endless-sphere.com/forums/


I'm pretty new to ebikes having just built mine, but it depends on what you want

from what I've read... 250watts won't do anything much at all, and 500wats is a much better choice

mine at 1500watts is crazy - I'd have gone with 1000w if I'd known - when you turn the accelerator from a stop, it doesn't just ease up to speed, it gives a real kick as it takes off, enough so you have to hold on tight to stay on it

more volts does = higher top speed

apparently my 72v 10ah battery pack should take me 10+miles @25mph without pealing at all

read up on chargers.... these LiFePo4 batteries aren't straight forward... you need a decent battery pack, and a decent charger which can balance charge all the cells properly if you want it to last a long time

p.s. iirc, the legal limit is 200watts

lucky for me, my motor has a 200watts sticker on it Wink Wink
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asorton
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« Reply #2 on: October 10, 2012, 08:07:22 AM »

I was going to buy my battery from this ebay seller in HK

http://stores.ebay.co.uk/vpower-hk3/_i.html?_fsub=2272019014

Also thge kit from the same HK seller

http://www.ebay.co.uk/itm/Rear-24v-250w-26-Wheel-Electric-Bicycle-Motor-Kit-Cycling-Conversion-Hub-E-Bike-/221137114212?pt=LH_DefaultDomain_0&hash=item337ccc9464

those batterys come with a charger, im going to have to do a lot more research.

On another thread (think its the one you linked to above) everyone was saying 1000W is overkill and as a more powerful motor just means a more expense battery I did not want to go too large.

the next question is do you increase the motor size or up the voltage eg 48V 250W or 24V 500W as the 250W is twice as fast as the 500W.

at 48V / 500W the say it will do 50km/h thats 31mph  Shocked

edit...
thats interesting I got the 250W as a some bay seller are selling 250W saying they are legal but your right it is 200W.

http://www.electricbicycles.co.uk/uk-laws.php
« Last Edit: October 10, 2012, 08:16:36 AM by asorton » Logged

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biff
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« Reply #3 on: October 10, 2012, 10:30:35 AM »

Hi Asorton,
               I got an ebike a year of more ago,A 26voltx250watt x 10ah.Three modes.You would,nt think to look at it that it had any power at all but it bowles along the road at a fair old whack and eats the miles.
  My aim was to eventually put a bigger motor on the front and use the small motor on the back for lift off,The present battery is only 2kgs.They are a great idea. fingers crossed!
                    Biff
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« Reply #4 on: October 10, 2012, 11:33:37 AM »

Thats interesting you get a good performance out of a 250W hub, I really am stumped now.
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« Reply #5 on: October 10, 2012, 12:27:02 PM »

The bike itself is 22kgs complete,the batts 2kgs
                      So its light and easy to propell.The best way forward is to find someone with an ebike and borrow it for half an hour.Then you will have a better idea.I would definatly like a bit more power (we all would) so when I get fit again I will most definatly fit a front wheel motor and battery.I think it is important to have the weight spread over the bike better.But a 2 wheel drive bike must be awesome genuflect
                                                                    Biff
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charliegolf
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« Reply #6 on: October 10, 2012, 12:29:46 PM »

Stupid question warning...

Could the hub of one of these things be used as a generator on a homebrew hydro DIY rig?  Thanks.

CG
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« Reply #7 on: October 10, 2012, 12:41:31 PM »

I think these little motors are mostly brushless but I would be a kind of a sin to use one for that purpose when you could be whizzing round the countryside on it instead.
                     Biff
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charliegolf
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« Reply #8 on: October 10, 2012, 01:20:32 PM »

Brushless: the field needs to be excited with a current from somewhere else? ie no magnets?

CG
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« Reply #9 on: October 10, 2012, 01:43:48 PM »

I am not sure CG,
                 Might be possible to get the specs in an online shop,I am waiting for someone who knows to step in here and put us right. Grin
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knighty
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« Reply #10 on: October 10, 2012, 01:46:22 PM »

Brushless: the field needs to be excited with a current from somewhere else? ie no magnets?
CG


no, they have magnets....

one of these motors would be really good for that, as long as you don't push them too hard because there's no internal airflow for cooling
(they all do re-gen breaking, which is basically the same thing)

if you check out the endless sphere forum (linked above) they have links to loads of motors that they're using on the bikes... the more powerful ones mount in the bike frame and drive the wheel via a chain.... most of those are air cooled so would be better suited to running for long periods :-)
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« Reply #11 on: October 10, 2012, 02:17:04 PM »


From what has been said I think I will go for a 500W hub, I just need to research the batterys tonight if I can justify the 48V one it can potentially do 31mph.
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« Reply #12 on: October 10, 2012, 03:12:38 PM »

I thought the electric bike trailers are quite a clever idea.  All the electrics +  battery + motor goes into the trailer so the only permanent thing you need on the bike is the throttle control.  If you don't want the electric and just want to go for a leisurely cycle somewhere, just unhitch the trailer and away you go.   Plus you have a trailer for the shopping.
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« Reply #13 on: October 10, 2012, 08:47:43 PM »

I like the idea of a push motor.

I have a 250 watt bike and its great but I would love 500 watts or 1000 watts.

I would build a pusher for a racing push bike, the links to ebay are intresting, thanks

Cheers

Jon
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asorton
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« Reply #14 on: October 10, 2012, 09:53:17 PM »


If i'm to achive a 20 mile round trip it looks like 24V is out 36V would be tight at 20AH so its looking like 48V/500W hub with a 48V 20AH LiFePo4 Battery (14.4Kg)

Type              Top Speed              Top Range              Battery
24V/500W      16mph (26KM/H)    17 M (28KM)           24V20AH
36V/500W      19mph (31KM/H)    19 M (31KM)           36V15AH
48V/500W      26mph (43KM/H)    26 M (43KM)           48V15AH
48V/1000W    32mph (52KM/H)    26 M (43KM)           48V15AH

The battery is 350 (plus any inport dutys) ouch!

That kit with battery & charger will be 500 and give me top speed 26mph & top range of about 34 miles.
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