Search found 61 matches

by redmouse
Apr 26 2020 7:46pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Honda z50j, first EV build
Replies: 11
Views: 431

Re: Honda z50j, first EV build

Before you start designing the battery, verify how many amps you controller ACTUALLY pulls on the battery side. Some manufacturers like to advertise their controllers with phase current (motor current), but that is highly misleading. I bought a "350A" designated Kelly controller that actually only p...
by redmouse
Apr 18 2020 7:40pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Quality of Kelly Controllers
Replies: 14
Views: 1042

Re: Quality of Kelly Controllers

I have a Kelly KLS7245N https://www.kellycontroller.com/shop/kls-mn/ Two things I dislike about it: -it's very slow from 0RPM and in very low speeds, its probably got some hardcoded ramp that limits the powerin slow RPMs and nothign can be done about it - Their current rating are for the motor, so e...
by redmouse
Apr 18 2020 7:30pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

Hey Dui, turns out you were completely right. Clamp meter only shows 90A maximum draw on the battery cables, so after accounting for some losses, the real power of my bike is actually around 5kW, so five times less than I thought. That's pretty humbling, and gave me a new perspective and respect fo...
by redmouse
Apr 02 2020 3:06pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

I hear the throttles have lag too. Does the throttle have any degree of lag? Default programming had a throttle lag, revs limited and I think 70% battery current limited. But that all was easy to reprogram with the bluetooth dongle. One single thing I dislike about the controller is starts from sta...
by redmouse
Apr 02 2020 1:49am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

generic shunt What did you just call me?? Haha, jk. I didn't know these existed, might be interesting to try! This all means next time I should get three times as big controller as I thought. The Nissan modules can allegedly handle 500A, if I'm running them on 140 then they are underutilized :flame...
by redmouse
Apr 01 2020 4:01pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

Thanks flat tire :) Actually measuring the battery current is a good idea, I have to see if I can get my hands on a meter that can do it, at least to get a rough idea.
Originally I planned to have a BMS that had a power meter function in it, but I broke it :oops:
by redmouse
Apr 01 2020 3:48pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

Hi Dui, thanks! about power - I would have to dyno it to get accurate number, but I feel the real power figure has to be more than 11kW. If you noticed at the beginning of the video, there is a Suzuki Gixxer 150 petrol bike, which allegedly has 10.9kW, and weighs slightly more (not by much). My ebik...
by redmouse
Mar 31 2020 9:40pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

I actually used a cheap throttle, this one for $10 https://m.aliexpress.com/item/32368229312.html?pid=808_0000_0101&spm=a2g0n.search-amp.list.32368229312&aff_trace_key=8700fa52d2b44cbc819677a64ace9be6-1567415867115-07715-bPi5BEcs&aff_platform=msite&m_page_id=5758amp-inLTyJO-q00Nmvp8cT_FVA15857085868...
by redmouse
Mar 31 2020 3:36am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

Re: 25kW Electric Pitbike / Small Motorcycle

Well, electric motor watt rating is just "recommended", you can actually run it on whatever you like as long as it doesn't overheat and the isulation holds.

More discussion about this particular motor here: viewtopic.php?f=30&t=99709
by redmouse
Mar 30 2020 1:13am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: 2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle
Replies: 19
Views: 1050

2̶5̶k̶W̶ 5kW Electric Pitbike / Small Motorcycle

update: I got the power calculation completely wrong, the bike actualy is only 5kW. Turns out although the controller says it's 350A, in reality it only draws 90A maximum from the battery, so after some losses and such, the final power is actually around just 5kW. It still feels crazy powewrful, but...
by redmouse
Jan 08 2020 8:02pm
Forum: E-Bike Reviews & Testing
Topic: Epic 7kw+ 12 fet controller...or there abouts :)
Replies: 139
Views: 18403

Re: Epic 7kw+ 12 fet controller...or there abouts :)

This has been an epic journey, thanks for sharing it with us!

Would you do a short recap of the mods, and what configuration worked best? And shunt mod, how did you get to 7kW specifically?
by redmouse
Nov 02 2019 5:05pm
Forum: Motor Technology
Topic: How many Amps can this 3500W rated QS hub motor actually take? (build planning)
Replies: 21
Views: 2184

Re: How many Amps can this 3500W rated QS hub motor actually take? (build planning)

Good day fellas, I have another question: I got this BMS from ICGOGOGO, that's rated for 400A (peak I assume) Do you think it's ok to pull 350A 30S peak through it? I have some doubts about the traces, it seems like they are too thin. Would it be ok in your experience, or is it worth soldering on so...
by redmouse
Aug 17 2019 3:23am
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1881
Views: 666816

Re: Your Creation's Before & After Pics

KalistoBG> I saw some custom length spokes on Aliexpress, might be a good option for you:

https://www.aliexpress.com/item/32786936115.html
https://www.aliexpress.com/item/32682585743.html

you could probably find some on ebay and such too.
by redmouse
Aug 17 2019 1:48am
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1881
Views: 666816

Re: Your Creation's Before & After Pics

KalistoBG wrote:
Aug 16 2019 12:38pm
some pic of my last build
I like it! Regular frame and small wheels looking good!
That rear wheel is gangsta af :) Does it stay true? Any plans to do proper spokes? Where is a good source for custom spokes?
by redmouse
Aug 16 2019 6:17pm
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

Thanks, that wattmeter sounds like a useful tool to have - I will put it on my wishlist, and once I stop being a cheap bastard I will buy it :D Meanwhile, I took the bike on my commute and it handled everything like a champ, except one hill. So I'm thinking, if I don't manage to hack the protection ...
by redmouse
Aug 15 2019 3:50pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 4019
Views: 363731

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

Good day folks, would anyone advise which pins on my controller are used for programming? Mine is 18-fet and the board looks different than the example controller. Or can I straight up use the display cables for programming? here's pictures of my controller: https://imgur.com/a/w2XMfQr And in case a...
by redmouse
Aug 15 2019 2:23pm
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

Well, whatever the explanation is, the bike is unusable in this state. It's not only annoying but also potentially dangerous becuse I can end up stuck in the middle of intersection with heavy bike that I can't pedal. I'm going to try removing solder from the shunts next. It has more than enough powe...
by redmouse
Aug 15 2019 5:54am
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

I need advice with programming the controller. Can anyone tell which pins on the board connect to the programing cable of STlinkV2? Better pictures of the board here (with power wires removed, so easier to see: https://imgur.com/a/w2XMfQr On the website there are wiring instructions, but the example...
by redmouse
Aug 15 2019 5:48am
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

More development: I replaced all power wires in the controller with some beefy af thicc gauge wires (10 or 8 AWG) and beefed up all the traces. Didn't even manage to screw up. Unfortunately it didn't substantially help the problem, controller is still cutting out. Interesting thing is it doesn't cut...
by redmouse
Aug 13 2019 12:08am
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

Yep, just confirmed it's definitely controller temperature related.

Took a heatgun and made the controller nice and toasty, and it started cutting out right from the go.

Now to figure out where is the temperature sensing/sensitive component and make it behave.
by redmouse
Aug 12 2019 7:04pm
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

Thanks! I'll try and look for something like that :) I also took some pictures of the controller, posting here in case anyone sees something: https://imgur.com/a/I7q7pZT I was wondering maybe it's the brown-orange thing touching the yellow lead in the very first picture? Wait, no, that's a 104J 100V...
by redmouse
Aug 12 2019 4:10pm
Forum: Motor Technology
Topic: Why would a controller cut out going uphill? (probably not battery related)
Replies: 24
Views: 1458

Re: Why would a controller cut out going uphill? (probably not battery related)

Meanwhile, I tried relocating the controller outside for better cooling (it was under a cover). Combined with cold weather it seems to improve things slightly. It still doesn't even remotely overheat (it feels pretty much stone cold even after an uphill ride). But it makes me wonder - could there be...