Pocket Bike conversion

From go-karts and bicycles to electric eskies and kids scooters.
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Gow864
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Pocket Bike conversion

Post by Gow864 »

My daughter has a 49cc 2 stroke pocket bike. would a 24V 450w motor and a couple 12V 18AH SLA's be enough for her to ride for half an hour or so? would 450w be powerful enough?

Thanks...
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antiscab
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Pocket Bike conversion

Post by antiscab »

49cc two stroke is about 6kw (if its a good quality one).
4 stroke 49cc is around 3.5kw.

on my moped, i use 60v, 70A for just shy of 4kw (when you take into account voltage sag).
Energy use depends on how fast you go. for me, with throttle full all the time, for half an hour (30km or so of riding), you need at least 20AH (usable) at 60v nominal for 60-70kmh.
for lithium you are looking at 30AH rated.
For lead acid, you need 40AH rated.

Conclusion: 450w will be absolutely gut-less when compared to a 50cc 2-stroke.

Matt
Last edited by antiscab on Wed, 10 Sep 2008, 17:57, edited 1 time in total.
Matt
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1999 Prius - needs batt
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Gow864
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Pocket Bike conversion

Post by Gow864 »

Thanks Matt.

This is a super cheapo chinese import, they call it 49cc, but I reckon my 20+cc chainsaw has more grunt. I just looking for a quick throw together that'll at least move her along at 20+kph...

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antiscab
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Pocket Bike conversion

Post by antiscab »

ah ok, so its more of a low power, non-road going type setup.
not sure i can give you a definate answer on this one.
you might try having a look at the endlessphere forums.

just note that 200w is the legal limit for un-licenced bikes.

Matt
Last edited by antiscab on Wed, 10 Sep 2008, 18:54, edited 1 time in total.
Matt
2017 Renault zoe - 25'000km
2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells
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Richo
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Pocket Bike conversion

Post by Richo »

antiscab wrote:200w is the legal limit for un-licenced bikes.


Someone should be shot for that regulation. Image


750W kit
But you would need more batteries as well.
Lithium pack from e-bay?
So the short answer is NO but the long answer is YES.
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Gow864
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Pocket Bike conversion

Post by Gow864 »

Cheers Richo....
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DVR
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Pocket Bike conversion

Post by DVR »

Richo wrote:
antiscab wrote:200w is the legal limit for un-licenced bikes.


Someone should be shot for that regulation. Image

Yep!!!
Bloody ridiculous law.
A kid can do maybe 50kph on a BMX going to school but in S.A.I can anly do 25kph going to work and in W.A I believe you can only do 10kph!!
What's with that??? Image
Seriously, I recon this is a cause the AEVA should persue. 500W would still be gutless but it would be usable. If they are worried about kids doing stupid things on them they should age restrict them. Not ban them.
Last edited by DVR on Fri, 30 Jan 2009, 15:31, edited 1 time in total.


So long and thanks for all the fish.
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Pocket Bike conversion

Post by Striker »

antiscab wrote:just note that 200w is the legal limit for un-licenced bikes.
In your state, perhaps.

Pocket-bikes are not allowed off of private property in NSW, and neither are electric scooters.

Here the 200w "law" applies only to electric-assist bicycles.

--Striker.
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the government treason and plot.
I know of no reason why the government treason
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