Search found 281 matches

by Elektrosherpa
May 17 2022 10:16am
Forum: EScooter/EMotorcycle Build Threads
Topic: Electric Roadster
Replies: 165
Views: 14364

Re: Electric Roadster

Dui, ni shuo de dui wrote:
May 16 2022 5:24am
That's so cool, you guys are lucky.
If it wasn't so cold there and if you guys had better food I'd really consider going there :lol: :lol: :lol:
Yes, I agree to the "cold" thing.
But food is no problem, you just need to cook yourself ;)
by Elektrosherpa
May 17 2022 6:14am
Forum: EScooter/EMotorcycle Build Threads
Topic: 1984 Honda Elite CH125
Replies: 19
Views: 1631

Re: 1984 Honda Elite CH125

If your BMS really says that it is designed for 40A, I can tell you from my experiences that this will be way too weak for really powering the QS138 motor: My battery came with a 65 A BMS, and this was too weak, too. I have exchanged it to one with 200/350 A, and only now the battery is useable. For...
by Elektrosherpa
May 16 2022 11:06am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Did another 25 km, observing mainly the motor temperature, and voltage drop when accelerating: With full battery at start (83-84V), voltage drops by 5-6 V while accelerating violently (full throttle). As soon as top speed is reached, Amperes go down and voltage back up. I moved the temp.sensor, whic...
by Elektrosherpa
May 16 2022 3:51am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

... please make sure that this is ok before everything else, if a motor burns it's far less drama than a battery ... Before starting to burn, there should be a remarkable rise of the battery temperature, no? I have 2 temperature sensors in the battery, which came with the BMS, and they didnt show A...
by Elektrosherpa
May 15 2022 1:22pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Good job on swapping your BMS, plus it seems to be an interesting one I haven't heard of before, which does active balancing, a relatively rare feature on cheap BMS :thumb: Hmm... I dont know what an expensive BMS costs, but to be honest, I don't find my BMS really cheap. Actually, it was one of th...
by Elektrosherpa
May 15 2022 3:56am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

I modified my battery box/holder (added a mechanical locking mechanism for the opening side cover), and at this opportunity I moved the temperature sensor of my controller display/speedometer from the controller (where I had put it first) to the motor, to observe the motor temperature more closely. ...
by Elektrosherpa
May 15 2022 3:51am
Forum: EScooter/EMotorcycle Build Threads
Topic: RIPPY SCOOT
Replies: 69
Views: 3372

Re: RIPPY SCOOT

... the motor gets very hot and doesnt cool down after stopping. ... The ctlr gets hot too and will probably get the fan/radiator that was intended for the battery pack. ... Would be interested to know what temperature you call "very hot" resp. "too hot". My QS138 is also gettin...
by Elektrosherpa
May 13 2022 11:09am
Forum: EScooter/EMotorcycle Build Threads
Topic: Electric Roadster
Replies: 165
Views: 14364

Re: Electric Roadster

Looks really cool, this minimalistic style. :thumb:

What I am asking myself:
Can you drive on the streets over there without a license plate ???
by Elektrosherpa
May 13 2022 4:16am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

_GonZo_ wrote:
May 12 2022 2:34pm
That is way I was proposing to increase the gear ratio in your motorbike.
I am afraid this is not possible:
I can not find a sprocket smaller than 11 teeth.
And the 70 teeth rear sprocket is the maximum I can fit without getting into contact with the swing arm etc.
by Elektrosherpa
May 11 2022 5:32pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

So you should be able to reach around 80 Km/h. To move a motorbike at 80Km/h you need around 4000W to 6000W So it is possible that the motor does not have enough power (it is a 3000W motor) to be able to move your vehicle at that speed. So if the numbers up here are right, then you are "chokin...
by Elektrosherpa
May 11 2022 5:10pm
Forum: Battery Technology
Topic: BMS w.bluetooth - question
Replies: 9
Views: 494

Re: BMS w.bluetooth - question

Their little display is amazing as well and has an on/off button for powering the BMS on for the first time and also for turning it on/off as you please (no self drain when off). .... Any questions about it, just let me know As described in the last posts, I have purchased and installed the JK BMS,...
by Elektrosherpa
May 11 2022 5:45am
Forum: Vendor Relations Corner
Topic: Dongguan Huanhuan Energy Technology Co., Ltd - absolutely to avoid
Replies: 0
Views: 283

Dongguan Huanhuan Energy Technology Co., Ltd - absolutely to avoid

The "Dongguan Huanhuan Energy Technology Co., Ltd" from Guangdong, China has fooled me badly with a battery purchase: I ordered a 72V 54Ah battery for my electric motorbike conversion, and clearly told them I need a battery capable of 150A continuous and 300A peak discharge, with separate ...
by Elektrosherpa
May 11 2022 4:59am
Forum: EScooters/EMotorcycles
Topic: INDEX, motorcycle and scooter E-Conversions
Replies: 40
Views: 4698

Re: INDEX, motorcycle and scooter E-Conversions

Bultaco Sherpa T350 (with Sammy Miller Highboy frame)
Motor: QS 138 70H
Controller: Kelly KLS 7245N
Battery: 72(84)V, 54 Ah (20s) / modified with BMS: JK-B2A24S-20P
Vorher-Nachher-klein.jpg
Vorher-Nachher-klein.jpg (1.9 MiB) Viewed 46 times
viewtopic.php?f=12&t=110352
by Elektrosherpa
May 10 2022 9:46am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Today another ~40 km test ride (still with first battery charge). Tried some slopes-no problem. Then went on our local motocross training ground and did a few rounds there- not in motocross speed, of course (nor me nor the bike are crossers), but faster than trials speed. Worked well, too. Cant you ...
by Elektrosherpa
May 09 2022 3:34pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Do you know more details like the KV (Revolutions per volt)? the rear wheel is a 4" tyre on a 18" rim, this results in a wheel diameter of at about 2026 mm A 2m diameter wheel seems to me that it is not correct :lol: Can it be something like 560mm? Is it the center area of the motor cover...
by Elektrosherpa
May 09 2022 11:11am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Back from another test ride. 30 km, Voltage went down from 83.5 V to 74.5 V. From observing the Amperes drawn while riding, it looks like the battery range will be something between 60 and 120 km, depending on the speed I am driving. At slow speed (~30 km/h) the power consumption is quite low (10-15...
by Elektrosherpa
May 08 2022 5:50pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Do you have the technical details of the motor? What is the reduction you have installed? What is the wheel diameter? As pointed out in the beginning of this thread, the motor is the well-known QS138 (3 kW nominal, many reports available saying that it can handle up to 15 or even 20 kW). The transm...
by Elektrosherpa
May 08 2022 10:22am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Thank you for the replies. So you both agree that the motor should NOT reach a temperature of 65°C. As far as I know, for the Kelly controller, the recommended setting for "motor temperature too high" is 130°C, and the recommended setting for "resume motor temperature" setting is...
by Elektrosherpa
May 08 2022 5:40am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Motor temperature is strange. ... Could be worth it to try changing the switching frequency in some steps. Are you talking about the setting in the Kelly Controller Settings, which I have labelled with a red arrow? Kelly Settings-PWM.jpg (these are not exactly my settings- it is a screenshot from G...
by Elektrosherpa
May 07 2022 1:20pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Today I put everything together, and went for a test ride. In contrast to the first time (with the BMS built in by the battery seller), it didn't last only 1,5 km (~1 mile), but at about 20 km. Driving was OK, top speed was a little lower than last time (maybe 70-75 km/h)- but I must admit that I wa...
by Elektrosherpa
May 07 2022 5:13am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

I tested the bluetooth connection of the JK BMS-had some doubts that it will work through the steel sheet metal battery box. Result: no problem :thumb: Might have to do with the fact, that the bluetooth of the JK BMS uses the power wires as antenna for bluetooth (at least that's what the seller told...
by Elektrosherpa
May 07 2022 4:25am
Forum: EScooters/EMotorcycles
Topic: NEW QS 165 MOTOR
Replies: 67
Views: 4172

Re: NEW QS 165 MOTOR

Hey, very nice! Iam currently trying to understand your calculation on hall sensor angle. Why did you choose 120° in the first place? And why add exactly 360°? Maybe you can point me in the right direction so I can look it up :) The circle is 360° and I want to place 3 sensors evenly on it. So ther...
by Elektrosherpa
May 07 2022 4:19am
Forum: Battery Technology
Topic: BMS w.bluetooth - question
Replies: 9
Views: 494

Re: BMS w.bluetooth - question

Since the top cover of my chinese battery didnt provide enough space for the JK BMS and all the necessary connectors, I have built a new cover from 1mm steel sheet metal: Battery-Cover.jpg (old cover and new one in process of making) Battery-NewCover.jpg final state I did a short test (not driving, ...
by Elektrosherpa
May 05 2022 2:34pm
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

Finished the new top cover for the battery case: Battery-NewCover.jpg Handlebar display plugged in, still lying loose on the battery. I put the old display into the cover again, it can be used to check battery voltage when the battery is removed from vehicle/handle bar display. Left side= charging s...
by Elektrosherpa
May 04 2022 4:31am
Forum: EScooter/EMotorcycle Build Threads
Topic: Conversion of a Bultaco Sherpa
Replies: 205
Views: 11810

Re: Conversion of a Bultaco Sherpa

This is really going to be a neverending story (or at least a very long lasting one)... Just for the records, this is what the battery looked like when I got it: Battery-badBMS.jpg As I said before, I have removed the shitty BMS (dont remind me of the work to remove all the sealing/glue stuff): Batt...