Controllers lacking support

[Floris]

I got a 1500 ebike kit from aliexpress which included an sw900 and generic controller. I'm pretty happy with the set, but i wanted some more options. The speed limiting worked fine, but i wasn't able to change the maximum amperage. Turns out a lot of sw900+controller combos dont do that, so i asked a seller on amazon (alex.song) wether their controller supported setting a max speed and amperage.

After 3 emails from probably 3 different people one of them said i should get the one with the ukc1 display because that allowed me to change the settings, but after ordering that it turns out it still doesn't do what i want. I can't set a max speed from the display, it just ignores that, and it resets its max amperage to 45 after every restart, even though it says its maximum is 35A.

I think i'll return the ukc screen+controller because it doesn't do what i wanted it to, or am i missing something?

Does anyone know of any display/controller combo that actually accepts changing settings? And what seller did you get it from?

Something to note maybe: one of the people i got a response from linked me to the risunmotor website, which my display has the logo of, but i did link them the combo on amazon i was specifically looking for and got their email adress from amazon as well.


Edit: this should probably be in 'technical' but i dont see a delete post button

 

[E-HP]

I got a 1500 ebike kit from aliexpress which included an sw900 and generic controller. I'm pretty happy with the set, but i wanted some more options. The speed limiting worked fine, but i wasn't able to change the maximum amperage. Turns out a lot of sw900+controller combos dont do that, so i asked a seller on amazon (alex.song) wether their controller supported setting a max speed and amperage.

After 3 emails from probably 3 different people one of them said i should get the one with the ukc1 display because that allowed me to change the settings, but after ordering that it turns out it still doesn't do what i want. I can't set a max speed from the display, it just ignores that, and it resets its max amperage to 45 after every restart, even though it says its maximum is 35A.

I think i'll return the ukc screen+controller because it doesn't do what i wanted it to, or am i missing something?

Does anyone know of any display/controller combo that actually accepts changing settings? And what seller did you get it from?

Something to note maybe: one of the people i got a response from linked me to the risunmotor website, which my display has the logo of, but i did link them the combo on amazon i was specifically looking for and got their email adress from amazon as well.


Edit: this should probably be in 'technical' but i dont see a delete post button

I think you'll first need to identify the controller. It should have a label that you can take a pic of. The SW900 works with Lishui controllers as well as JN / DC MOTO CONTROLLERBYLITHIUMBATTERY controllers and some other oddballs. It's a display that's often programmed specifically for a controller, with certain parameters being locked down or limited in range in the process. If you order one separately from the controller, it's a crap shoot on whether all of the functions will work.
Once you identify the controller, folks with more familiarity with those controllers might be able to provide more insight.
Do you have a link to the kit?

SW900 hard core tweaking

Greetings! I've just got myself a Chinese conversion kit with SW900 display and have been dialing in for a while. It's a 1000w 48v HUB motor installed on the rear wheel of a 20inch fold Carraro Flexi with 21 speeds. I've got three questions: 1- Is it possible to control the voltage level of...

endless-sphere.com

 

[Floris]

I think you'll first need to identify the controller. It should have a label that you can take a pic of. The SW900 works with Lishui controllers as well as JN / DC MOTO CONTROLLERBYLITHIUMBATTERY controllers and some other oddballs. It's a display that's often programmed specifically for a controller, with certain parameters being locked down or limited in range in the process. If you order one separately from the controller, it's a crap shoot on whether all of the functions will work.
Once you identify the controller, folks with more familiarity with those controllers might be able to provide more insight.
Do you have a link to the kit?

SW900 hard core tweaking

Greetings! I've just got myself a Chinese conversion kit with SW900 display and have been dialing in for a while. It's a 1000w 48v HUB motor installed on the rear wheel of a 20inch fold Carraro Flexi with 21 speeds. I've got three questions: 1- Is it possible to control the voltage level of...

endless-sphere.com

Hi, thank you for your reply. I bought both controllers and displays in combination, so the sw900 and generic controller came with the kit, and i bought a display+controller combination after that to try to limit amps.
Here is the link where i got the kit: https://nl.aliexpress.com/item/1005...o.order_list.order_list_main.5.569e79d2yED5yJ
Here is the link where i got the new display+controller: Amazon.nl

The sw900 (came with grey controller) says "S/N:2112 18 YE 232 D" on the bottom, and has a 48v sticker. This lets me limit my max speed just fine, but the amperage setting only goes up to 20 and gets ignored by the controller which always goes to 1500w.

The ukc1 (came with black controller) says "UKC1-VT4.91G-HS-OMD-20240531-N66. In its menu it says its on hardware version 3.0 and software version 4.0. This ignores its maximum speed setting and forgets its maximum amperage setting on restart, changing it to 45.
I also emailed the amazon company expressing my disappointment in the settings not working or resetting, and they also say the speed limit doesn't work and that i should just use a lower assistance level. That's not why i got a fancy screen with a max speed setting.
They also say that "Current limit can be set, and maximal is controller max current, so even you set as 100, it will be maximal only 35A or 45A (according to the controller)." So my controller with a 35A sticker is 45A? That's not what i ordered, and forgetting the setting when i turn it off isnt saving to me. It does actually deliver less power when you turn it down, but i don't want to have to go to the menu, put in a password, etc etc every single time. Interestingly it does remember its maximum speed setting, even though it doesn't use it.


I added some pictures of the ukc1 display and controllers. The ukc1 display looks like that usb port screws off but according to the manual its only for charging phones.

If there is more info or pictures you or anyone else needs just let me know. I'd prefer having this display do what i want, so if there's anything i should try please let me know.
If these simply can't do it, what vendor sells controllers or combinations that support all this?

Edit: I read the link you sent, and i did find something similar about the sw900 and controllers not supporting all of the displays functions, so i guessed i just had an old sw900, but for the new one i specifically asked for one that could limit speed and amperage. Maybe i shouldve been more specific than 'being able to change it', but i doubt many people would see 2 options for speed (20 km/h or unlimited) and a resetting amperage setting as such.

 

[Chalo]

So let me get this right. You ordered a cheap shady generic Chinese controller, and you think you should be able to program it like it's not cheap, shady, generic, or Chinese?

I like dirtbaggy controllers. But I don't expect them to do anything other than whatever it is they do.

 

[Floris]

So let me get this right. You ordered a cheap shady generic Chinese controller, and you think you should be able to program it like it's not cheap, shady, generic, or Chinese?

I like dirtbaggy controllers. But I don't expect them to do anything other than whatever it is they do.

I didn't expect the sw900 to do much and i agree that controller (the whole kit) is cheap shady and chinese, but i had not looked into displays too much at that point and to be fair it does what they said it'd do.

For the other one i specifically asked for functions and they said that ukc1+controller combo was the one to get, so i expected more from that.

But what would you recommend thats actually programmable? Any brands? Websites that ship to the netherlands?

Not to be rude but i know these suck thats why i made a post, i'm interested in making one of these work or in something i can trust, your comment doesn't really get me further.

Edit: it seems like people use sabvoton/mqcon controllers and can program those but if sabvoton.net is their real website they're like half the price of amazon or aliexpress making them the cheapo-est chinese controllers. What controller do you use? And is that programmable or is that not important for you?

 

[Chalo]

But what would you recommend thats actually programmable? Any brands?

I use a lot of KT controllers. They're cheap, mostly reliable, easy to configure. You can turn the max current down by half, with several other set points in between 50 and 100 percent. You can set the top speed, and the fraction of top speed delivered by the level settings less than 5 (which is maximum).

Websites that ship to the netherlands?

eBay.nl? That's where I'd start.

What controller do you use? And is that programmable or is that not important for you?

Lately, it's this:

Brushless Motor Controller-Sine Wave 1200W 48V/60V/72V 35A 15mos For E-Bike | eBay

Color: As Pictures Show. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.

www.ebay.com

Similar ones are available in higher and lower current ranges. They're extremely smooth, quiet, and easy to set up. The 60A one I had failed in less than ten minutes of use, but the two 35A versions I own have been faultless. If they are programmable, I don't know how that would be done. They don't support a display.

 

[Floris]

Thanks for the info! It looks like all KT displays have the same options to limit the amperage.

Sucks that that 60A controller died so fast. I'm not really looking for a controller without display.

Ebay is the same level as aliexpress or amazon when it comes to prices and delivery dates, so i assume also in shadyness. That means i still need to figure out wether their controllers actually support all the displays settings. Did all of your KT display/controller combos let you do what you wanted?

I think my homework for now is to figure out what displays are supported, what kind of settings those offer so i can pick what i want and then figure out who sells a display/controller combo that supports those settings.

Seems KT's website has a controller page: LCD Display Meter--Suzhou Kunteng Electronics Co.,Ltd--Suzhou Kunteng Electronics Co.,Ltd
Other options: LCD3, LCD4 and LCD5, LCD6, LCD7U, LCD7C, LCD8H, LCD8HU, LCD9R
LED displays exist too, but those look too simple to offer a settings menu.

Edit: I edited this paragraph above with the LCDs a few times and all of them regulate power with divisions from 1 (full power) to 2 (half power) as power settings.

Edit 2: Do you buy your KTs from kunteng or someone else who uses the same communcation system? Also, in a way this still isnt exactly what i was thinking of because i dont get adjustments that go per amp, deep down i hope there is an sw900+controller combo out there where all of the functions work.