Search found 219 matches

by ChrisBarron
Wed Aug 13, 2014 10:41 am
Forum: Electric Motor Bikes
Topic: Elecscoot E4 scooter with LiFePO4 cells
Replies: 15
Views: 32848

Re: Elecscoot E4 scooter with LiFePO4 cells

It is possible that that one cell was faulty from the start and therefore the very reason why you couldn't travel above 20mph. Once the whole pack is charged you can remove that one cell and see how it goes. Charging with a missing cell would cause an overvoltage problem across the pack, unless you ...
by ChrisBarron
Tue Aug 12, 2014 8:08 am
Forum: Electric Motor Bikes
Topic: Elecscoot E4 scooter with LiFePO4 cells
Replies: 15
Views: 32848

Re: Elecscoot E4 scooter with LiFePO4 cells

According to the website Grumpy it has 20 cells, 60V at 70Ah. (4.2kWh) Not sure that TS or Winston ever made a 70Ah cell, so maybe they were between iterations when they wrote the tech spec. They quoted 100 mile range, which would have to be at an average consumption of 42Wh/mile, not even bicycles ...
by ChrisBarron
Sun Aug 10, 2014 6:38 pm
Forum: Electric Motor Bikes
Topic: Elecscoot E4 scooter with LiFePO4 cells
Replies: 15
Views: 32848

Re: Elecscoot E4 scooter with LiFePO4 cells

Hello Colin, I take it that you have the Elecscoot 4 if you expect a top speed of 60mph and a 100 mile range ? http://www.greenelectricbikes.co.uk/elecscoot-scooter-range.htm I don't know where they fit all the cells to get that level of performance, but there you go. How much money would you like t...
by ChrisBarron
Sat Aug 09, 2014 11:34 am
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

The latest speed test video is here https://www.youtube.com/watch?v=LdhxEzJ7owk&feature=youtu.be As an added stroke of luck I was looking for acharger and saw an old Thundersky 80V (7A) charger on ebay, which was just managing to produce 2V and so was listed as faulty. The seller gave it to me f...
by ChrisBarron
Wed Aug 06, 2014 7:53 pm
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

Another test completed, this time with a current shunt in circuit to get some useful data. Peak speed was 66kmh (I have a relay driver on it's way which will allow me to introduce a controller bypass. The controller only reaches between 90-95% pwm and has an output to drive a bypass controller. I'm ...
by ChrisBarron
Thu Jul 31, 2014 4:02 pm
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

I just rigged up a datalogger and found a stretch of disused road to play on. Although the road was not long enough to allow me to run up to top speed, I was reaching 60kmh in under ten seconds and it felt like 70-80 was achievable because it had more to give. Still not getting my hopes up too much,...
by ChrisBarron
Mon Jul 28, 2014 5:50 pm
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

The woodruff key has been replaced (humourously with one designed for a Lambretta scooter, it's a perfect fit !) I've moved on with a few other things too. The LiFePO4 Headway pack is assembled, and a fuse is fitted to both battery packs at their positive terminals. The potbox is behind the headstoc...
by ChrisBarron
Sat Jul 05, 2014 4:36 pm
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

It was going so well..... The woodruff key on the motor/front sprocket has sheared through. It goes to show how much torque is being generated, not surprised really, I'm not the lightest passenger in the world ! It probably should be a sign that I definitely ought to change the gearing to keep the t...
by ChrisBarron
Sat Jul 05, 2014 1:27 pm
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

Having realised that the gearing is not helping the motor work with it's current drive system, I decided I could either change rear sprockets (could be expensive to get one made), or try doubling the pack voltage. I had read somewhere in the past that the EV10 24-48V controller I have can actually s...
by ChrisBarron
Tue Jul 01, 2014 9:44 pm
Forum: Electric Motor Bikes
Topic: Another EV bike :)
Replies: 135
Views: 179954

Re: Another EV bike :)

Throttle pot arrived this AM and I managed to hook it up this evening....and find a quiet piece of tarmac to test on. Initial feelings are that it might not get to 50mph, but it's too hard to tell of the acceleration is limited due to the motor current limit or an all round lack of power. I think a ...

Go to advanced search