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Messages - Lope

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1
Tech Help / Re: want to build a fast bike, 25-100 hp
« on: September 18, 2009, 01:42:13 AM »
I see. so lithium is the way... :)
Bogan: not ready to build yet, or consider budget seriously, just checking it out.
Frodus: thousands of volts? surely it would be possible to use a step up DC-DC powersupply with a wide input voltage?

According to what I've read on wikipedia, the energy storage abilities of super caps will surpass lithium batteries in the next few years.

2
Tech Help / Re: want to build a fast bike, 25-100 hp
« on: September 11, 2009, 05:00:45 AM »
on a flat road, the forces on the bike are rolling resistance, wind drag, and motor power. It seems to me that lead would only increase rolling resistance a bit, which should not affect top speed much?

I've read of new lead acid technologies that can give up to 1500 cycles, would such batteries be suitable with an EV?
http://www.battery.co.za/Standby/sbyASpec.asp?CAT=K

Cant wait for those super super capacitors to go into mass production...

3
Tech Help / Re: want to build a fast bike, 25-100 hp
« on: September 10, 2009, 03:24:25 PM »
Bogan: Thanks for the info.
So lead acids will give crappy acceleration. What about high cruising speed. Surely lead acids and 2 Etek-rt motors will provide the cheapest high speed solution? For max speed you need power, not power/weight?

4
Tech Help / Re: want to build a fast bike, 25-100 hp
« on: September 09, 2009, 04:38:49 PM »
Ok, thanks for the info guys. You've made a strong case for lithiums, but will have to see what the budget says when its time to build.
Is it true that lead acid batteries would compromise acceleration, but not really top speed?
When you did those acceleration calcs, what weight were you using? (assuming a basic lead or lithium pack?)

5
Tech Help / Re: want to build a fast bike, 25-100 hp
« on: September 08, 2009, 02:35:51 PM »
Thanks for the reply Bogan
that package you linked to is quite nice. 400A @ 72V is 41hp, continuous I'm assuming?
What happens if you need 400A and contactors only seem to come with 200A continuous? can you run them in paralell?
The 2 25kg motors will be a lot easier to work with than a 68kg motor. Plus with permanent magnets it will be a lot more efficient? (not to mention regen)

I'm not keen on LiPO because batteries are a disposable item, thats a LOT of money to spend on disposable stuff. I realize if you factor in max charge cycles etc they're not bad, but still, its not in the budget.

When I've looked at deep cycle batteries, the manufs don't list anything like the CCA, (often only capacity) so how can you work how much current you can draw from them for x amount of time?

Then ofcourse how do you work out how much capacity you need?
Lets say you have a 100Ah deep cycle battery, is it realistic to think you can get 200A from it for 15 mins? or 400A for 7 mins? (50% DOD)
Imagining 6 100Ah batteries on a bike with 50kg of motors is no joke :)
Then how do you work out range at a conservative power output and speed?
Are there any online calculators you recommend?

Once I have some experience with electric bikes I'd probably want to include a small petrol motor in the bike in case of getting stuck :)

6
Tech Help / want to build a fast bike, 25-100 hp
« on: September 07, 2009, 10:44:38 PM »
I'm hoping some people can comment on whether this is feasable...
most electric motorcycles seem to be quite slow.

To compare, I've ridden the Bajaj 180cc Pulsar (12hp max) on the highway and its quite painfully underpowered. It goes up to 100km/h easily enough, but only after holding it at full throttle for 10-15 seconds you can eventually get up to about 115. The Bajaj pulsar 180 is not aerodynamic by any means.
I'm rather used to my 20 year old Honda VFR400 NC24 which made 60hp when new. Its obviously lost a lot of horses but still gets your juices flowing all the way up to 230km/h if you have the kahunas.

Basically I want a really powerful motor and lead acid batteries. (flooded or AGM)
I haven't seen anyone attempt putting this in a motorcycle yet...
http://www.evparts.com/prod-MT2120.htm
At 144 VDC, 28.5 HP continuous, 30.4 HP for one hour, 48.8 HP for five min., 100 HP peak
It would require 12 batteries, that can do a lot of current.
I read somewhere you can't do regen with this motor... is that true?

I don't care about range, I just want it to be fast, and as cheap as possible :) It must be able to do about 140km/h.

My 2nd choice would be this motor: 84V 25hp peak http://www.electricmotorsport.com/store/ems_ev_parts_motors_sepex.php
but then I'd probably want to run 2 of them...

I realize the main challenge here is getting enough battery power into a bike to run these motors... is it doable?
Are there any guides about what motorcycle frames to use? I've seen people use 250cc frames up to 1000cc frames. It doesn't seem to make a lot of difference...? (As long as the batteries fit and the weight of the batteries isn't much more than the ICE components)

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