Search found 5452 matches

by d8veh
Jun 07 2018 9:30am
Forum: E-Bike Technical
Topic: Cop proof throttle
Replies: 32
Views: 1810

Re: Cop proof throttle

In Europe, Australia, and anywhere else that EN15194 applies, you cannot restrict a motor to 250w to make it legal. The requirement is that the motor must be rated by the manufacturer at no more than 250w. You cannot use a motor rated at more than 250w, no matter how little power you put through it....
by d8veh
Jun 07 2018 9:05am
Forum: E-Bike General Discussion
Topic: Q128C sources?
Replies: 25
Views: 1229

Re: Q128C sources?

Thanks Molybdenum, I will give that a try as soon as I get my order from BMSB. I am also going to order the set of gears from the Ebay seller in London. If they turn out to be the right parts maybe I'll be able to repair the core too and keep it as a spare. Are you sure that it's your gears that ar...
by d8veh
Jun 07 2018 8:38am
Forum: E-Bike General Discussion
Topic: Watt or Ah Meter Options?
Replies: 10
Views: 543

Re: Watt or Ah Meter Options?

The LCD3 also shows actual battery voltage if you press the power button twice. You soon figure out the relationship between range and voltage. The cheap wattmeters are OK if you modify them. You can add add an auxillary battery so that they don't lose their memory, and you can rewire then with a re...
by d8veh
Dec 13 2017 1:33pm
Forum: E-Bike General Discussion
Topic: Electric handbike
Replies: 20
Views: 1254

Re: Electric handbike

I think the Q100 is a bit small for operation by the throttle alone. It'll work, but I think the Q128C will be able to handle the torque much better. The Bafang CST would also be good, but I'd get the 500w version if you can because it's the same size and weight as the 350w one, but it can handle a ...
by d8veh
Dec 03 2017 5:19am
Forum: E-Bike Technical
Topic: 36 Volt 350 watt controller how to connect?
Replies: 15
Views: 1094

Re: 36 Volt 350 watt controller how to connect?

The 14v wilĺ drop to 5v as soon as you connect. It comes through a pull-up resistor, so everything is protected by that resistor anyway.
by d8veh
Dec 03 2017 5:00am
Forum: E-Bike Technical
Topic: KT-LCD3 Stuck
Replies: 1
Views: 291

Re: KT-LCD3 Stuck

Did somebody put a password in? If so, it's locked without the password.
by d8veh
Dec 03 2017 4:50am
Forum: E-Bike General Discussion
Topic: Trying to connect LCD3 to Kunteng controller
Replies: 4
Views: 698

Re: Trying to connect LCD3 to Kunteng controller

You can't connect the LCD to that type of controller. The 5 way connector carries data to communicate between the two, without those two two wires on the controller, it can't communicate. You can use the LCD as a battery gauge and main switch, but that's all. None of the other functions will work, a...
by d8veh
Nov 24 2017 9:30am
Forum: E-Bike Technical
Topic: The Swizzbee (aka Dolphin) ebike - help !
Replies: 12
Views: 742

Re: The Swizzbee (aka Dolphin) ebike - help !

He posts regularly on the UK forum under the name Nealh. AFAIK, it's all sorted now. I'm sure he'd be happy to make dialogue with you.
http://www.pedelecs.co.uk/forum/electric-bicycles/
by d8veh
Nov 24 2017 9:24am
Forum: E-Bike Technical
Topic: Low voltage indicated with full charge
Replies: 7
Views: 497

Re: Low voltage indicated with full charge

Try setting P5 to zero.
by d8veh
Nov 23 2017 7:36am
Forum: E-Bike Technical
Topic: 2WD (Two-Wheel Drive) FAQ
Replies: 214
Views: 41104

Re: 2WD (Two-Wheel Drive) FAQ

You can use one throttle with more than one controller provided that you only use the 5v wire from one controller, i.e. don't parallel the 5v wires. If you're using more than one battery, you need to make sure that the grounds are linked to give one common ground. You don't need a buffer if you do i...
by d8veh
Nov 23 2017 7:20am
Forum: E-Bike General Discussion
Topic: PAS Sensor/ magents not holding..
Replies: 5
Views: 385

Re: PAS Sensor/ magents not holding..

I don't understand. The magnet disc is clamped between the crank and the bearing on a hollowtech installation, so it can't slip. Can you show a photo of what you've done?
by d8veh
Nov 22 2017 7:29am
Forum: E-Bike Technical
Topic: High-speed, long-distance (heavy "30^3") Q128 commuter build
Replies: 67
Views: 4596

Re: High-speed, long-distance (heavy "30^3") Q128 commuter build

Is the brake binding? The wheel doesn't look true enough for a rim brake.
by d8veh
Nov 21 2017 5:42am
Forum: E-Bike Technical
Topic: Shengyi Motors
Replies: 10
Views: 781

Re: Shengyi Motors

The slower one will have better efficiency at low speed. The efficiencies change with speed, so which one climbs best depends on the speed at which you ae climbing.
by d8veh
Nov 20 2017 5:29am
Forum: E-Bike Technical
Topic: KT-LCD1 vs KT-LCD3
Replies: 16
Views: 1782

Re: KT-LCD1 vs KT-LCD3

Thanks for the reply; that sounds about right to me. A 36v 10A controller will top out around 420 watt (10*42v), so in theory my 11A controller should do 440 watt, possibly more with the peak rated at 22A. You're right to think it might be subjective, I confirmed it by taking both controllers out o...
by d8veh
Nov 20 2017 5:14am
Forum: E-Bike Technical
Topic: 48 Volt 1000 watt controller how to connect throttle?
Replies: 3
Views: 453

Re: 48 Volt 1000 watt controller how to connect throttle?

Normal colouring is green for the battery level indicator LEDs and yellow and brown for the throttle switch. All are optional. If you want to use those things, you need to confirm that the green is battery voltage with a meter. There's a fair chance that the electric door lock red is the ignition wi...
by d8veh
Nov 20 2017 5:06am
Forum: E-Bike Technical
Topic: Unknown Controller
Replies: 3
Views: 468

Re: Unknown Controller

I agree with Motomech. You could use the opportunity to get a better controller. What's it for? Why do you want to change to 48v?

I would say that there's a fair chance that it'll work at 48v, though you'll lose the low voltage cut-off, so you'll need a way of managing that yourself.
by d8veh
Nov 16 2017 5:27am
Forum: E-Bike Technical
Topic: Reconnecting some wires, a beginner's journey
Replies: 16
Views: 885

Re: Reconnecting some wires, a beginner's journey

I wouldn't crimp anything on the motor phase wires or the battery wires. It can work in theory, but only if done absolutely perfectly. The best connector is no connector. I've built many electric bikes and I've never found a need to disconnect a controller once I've installed it, so I tend to solder...
by d8veh
Nov 16 2017 5:15am
Forum: E-Bike Technical
Topic: Throttle cuts off after I hit a bump / pot hole
Replies: 4
Views: 285

Re: Throttle cuts off after I hit a bump / pot hole

Your battery is losing it's connection, so look there to solve your problem. When the battery is switched on, your controller goes through an initialisation procedure. It checks the throttle voltage, and if it doesn't show as zero throttle, it won't give power until it gets a zero throttle signal fi...
by d8veh
Nov 15 2017 8:47am
Forum: E-Bike Technical
Topic: LEILI Bike 5000w LL-7280 Controler diagram
Replies: 2
Views: 432

Re: LEILI Bike 5000w LL-7280 Controler diagram

Show photos of the wires and connectors. Many controllers use standard wiring.
by d8veh
Nov 15 2017 8:45am
Forum: E-Bike Technical
Topic: KT-LCD1 battery voltage setting
Replies: 12
Views: 1795

Re: KT-LCD1 battery voltage setting

P5 doesn't affect the running of the bike at all. You can make it any number you want. It's just for showing the segments on the battery display to stop it jumping up and down with voltage sag.
by d8veh
Nov 15 2017 8:35am
Forum: E-Bike General Discussion
Topic: 350w vs 500w geared hub motor
Replies: 15
Views: 3246

Re: 350w vs 500w geared hub motor

I had some XF07s, that I ran at 36v and 44v. They were around 270 rpm at 36v. The voltage didn't seem to have any effect on torque like it normally does, neither did increasing the current do much, so I spoke with MXUS about it. They told me that I most likely had the Chinese version with weak magne...
by d8veh
Nov 14 2017 8:35am
Forum: E-Bike Technical
Topic: New battery cases?
Replies: 1
Views: 316

Re: New battery cases?

It's a Reention Thunder DT-1. You sometimes see them on Aliexpress, but only if you're lucky enough to enter the right search string.

http://www.reention.com/product/detail/45
by d8veh
Nov 14 2017 8:11am
Forum: E-Bike Technical
Topic: High-speed, long-distance (heavy "30^3") Q128 commuter build
Replies: 67
Views: 4596

Re: High-speed, long-distance (heavy "30^3") Q128 commuter b

Hmmm! A lot of strange results. You're using 36v? You wouldn't want to run a 36v 328 rpm one at 48v. Are the two motors both Q128Cs? With these sort of motors, the no-load power is generally around 36W at around 20 mph. The motor has a one pulse per ritation speed sensor in it, which the controller ...
by d8veh
Nov 14 2017 7:53am
Forum: E-Bike General Discussion
Topic: 350w vs 500w geared hub motor
Replies: 15
Views: 3246

Re: 350w vs 500w geared hub motor

It depends which motor it is. MXUS make a lot of different ones. As I said previously, the 350w rating means very little. You can kill it with 250W or run happilly with 750w. It just depends how you use it. The important characteristic is the kV or RPM at any given voltage. Say you had a typical gea...
by d8veh
Nov 12 2017 5:29am
Forum: E-Bike Technical
Topic: Reconnecting some wires, a beginner's journey
Replies: 16
Views: 885

Re: Re-soldering some wires, a beginner's journey

Soldering technique is different on different types of joints so it's difficult to give exact advice, but as a general rule, keep the soldering iron tip on the joint from before until after you add the solder. With big joints, give plenty of time to allow the joint to heat up so don't be in too much...