Search found 1109 matches

by eee291
Dec 29 2020 4:16pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 18
Views: 861

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

I put about 200mil of this stuff in my QS3k mid drive like 2-3 years ago without thinking much about it, maybe I'll open the motor this week and check if any damage occurred :!:
https://www.duralag.ch/uploads/qRexMlJd ... D_ELow.pdf
by eee291
Dec 27 2020 3:39pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

you could try a few things. - try different version of the App - connect with other devices. Android or even better, IPhone. - disconnect all other devices from that box and use only the battery with BMS - try other Bluetooth module - check/post all app settings on here Thanks for the reply! I will...
by eee291
Dec 26 2020 8:39am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

you could try a few things.
- try different version of the App
- connect with other devices. Android or even better, IPhone.
- disconnect all other devices from that box and use only the battery with BMS
- try other Bluetooth module
- check/post all app settings on here
by eee291
Dec 15 2020 2:36pm
Forum: Battery Technology
Topic: Can you see anything wrong with this pack build?
Replies: 21
Views: 949

Re: Can you see anything wrong with this pack build?

is this your battery or is this a "design" you want to copy? because if it's the former then what's the point of critiquing it? You have nothing to add, no technical critique or engineering suggestions? .... Your just doing a post count bump for yourself? I've got something useful to add ...
by eee291
Dec 14 2020 3:45pm
Forum: Battery Technology
Topic: Can you see anything wrong with this pack build?
Replies: 21
Views: 949

Re: Can you see anything wrong with this pack build?

is this your battery or is this a "design" you want to copy?
because if it's the former then what's the point of critiquing it?
by eee291
Dec 12 2020 5:31am
Forum: EBike Technical
Topic: 32Volts 8Amp Battery
Replies: 3
Views: 217

Re: 32Volts 8Amp Battery

From what I can tell your Battery meter isn't made for your battery voltage, and that's why it always shows full. It suddenly showing is empty because the BMS has cut all power. If the battery is a 10S it should charge all the way to 42V and be empty at 30V, but since the BMS allows it to go way bel...
by eee291
Dec 10 2020 5:45pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

Forum websites make lots of money from the ongoing ever-repeating discussions. look who's making bank, 6780 posts in just 2 years :o Yes a Wiki is better for semi-static structured info everyone collaborating to build it and keep it maintained. Stop! It's already dead :oops: Will require a differen...
by eee291
Dec 10 2020 5:44pm
Forum: Items for Sale - New
Topic: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China
Replies: 1407
Views: 301302

Re: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

I wanna build a motoped(or vector vortex) frame and 19"moto wheels with a qs138 and top out at 90ish will the 138 have enough torque to be fun geared to 90mph/144kph? I really wanna have a bike thats fast for off road and have pedals to ride back home lol... 144km/h on a bicycle, hope you like...
by eee291
Nov 29 2020 5:33pm
Forum: EBike Technical
Topic: Stromer st1 diy build
Replies: 1
Views: 647

Re: Stromer st1 diy build

135mm to 150mm isn't a big deal IMO just use some washers to compensate.
And yes, for your use case the the QS 205V 3 is too much if you aren't looking for trouble :lol:
by eee291
Nov 29 2020 5:22pm
Forum: EBike General Discussion
Topic: The battery has three wires. We only have +- controllers. Please help me.
Replies: 1
Views: 204

Re: The battery has three wires. We only have +- controllers. Please help me.

If the new controller is aftermarket and only needs + and - then you can ignore the 3s wire, unless it needs a signal there to activate the BMS but I have no idea.
If it doesn't work just install a aftermarket BMS on the battery as well and you should be good to go.
by eee291
Nov 29 2020 5:14pm
Forum: General Discussion
Topic: How to hook up a single wire brake light
Replies: 1
Views: 289

Re: How to hook up a single wire brake light

That's not how that works.

Applying 12V to brake HI causes the Controller to either regen or just ignore the throttle input.
You need an existing 12V system just like on a motorcycle or car where it sends 12V to the brake lights... and the controller in this case.
by eee291
Nov 15 2020 11:54am
Forum: Battery Technology
Topic: Rectifier Huawei R4850G2 48V 42~58V 3000w
Replies: 136
Views: 26933

Re: Rectifier Huawei R4850G2 48V 42~58V 3000w

There is a link to a Chinese forum in this thread and a ton of other posts with info, it's just a few pages back.
by eee291
Nov 08 2020 7:50am
Forum: E-Vehicles General Discussion
Topic: BMW E "i5" conversion by Matija
Replies: 52
Views: 7209

Re: BMW E "i5" conversion by Matija

In Austria there is one TÜV inspection site per state, I happen to live like 10 minutes away from one and asked once about converting a car. They just looked at me funny and said they have no clue and it's probably too much of a hassle for all of us. It seems to me like they are really old fashioned...
by eee291
Nov 06 2020 2:09pm
Forum: Large EV General Discussion
Topic: Connecting EV motor to splined shaft
Replies: 2
Views: 618

Re: Connecting EV motor to splined shaft

You will need some custom work done.

https://www.hayescouplings.com/hayes-cu ... -adapters/
Something like this maybe
by eee291
Nov 06 2020 1:06pm
Forum: Battery Technology
Topic: Help with LG chem Batteries
Replies: 5
Views: 296

Re: Help with LG chem Batteries

That cell looks beat up as hell, hope the rest don't look like that.

The only way to find the Ah rating for sure is with a capacity meter/Battery capacity tester.
by eee291
Nov 03 2020 4:38pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

I know that the cell counts are configurable in the PC software, but can they be set below the range that they are advertised as being capable of handling? For example, if I buy the 15S version of the 10S-15S BMS linked below, can I configure the BMS to work properly on 8S? I am running 8S right no...
by eee291
Oct 28 2020 4:19am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 82733

Re: QS 3000w midmotor

I'm pretty sure the QS 3K is enough to pull a small car, you just need proper gearing that's all.
by eee291
Oct 28 2020 2:53am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 82733

Re: QS 3000w midmotor

How does this one compare to the Cyclone 3K, for torque grunt at low speeds? I'm pretty sure the cyclone uses a planetary gear set inside the casing, but if we compare purely motor shaft torque then the QS always wins, I don't think the cyclone can handle 25kw peaks. Note that by comparing the cycl...
by eee291
Oct 28 2020 1:48am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 82733

Re: QS 3000w midmotor

I'm trying to get a handle on Kv/winding vs pack voltage issues thus eliminating gearing for simplification, even if just a thought experiment. But also (just curious), isn't there an equivalent DD hub motor version of this unit? QS 205 50H for ebikes, for motorcycles they have some up to 14Kw cont.
by eee291
Oct 27 2020 1:12pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 82733

Re: QS 3000w midmotor

Well of course you lose power due to friction in the motor and drive train, and not to forget electrical losses inside the motor (eddy currents).
There's also a certain rpm range where the motor runs most efficient, if it's outside that range the motor will convert a ton of energy into heat.
by eee291
Oct 27 2020 11:21am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 609
Views: 82733

Re: QS 3000w midmotor

simple, 5000w/72V=69.44A which is pretty weak IMO.
I'm running it with 450A phase and 250A Battery, I can't even get the motor to get hot with repeated launches and hard acceleration :shock:
by eee291
Oct 25 2020 3:36pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

Andrewol wrote:
Oct 25 2020 12:19pm
I'm just asked here if built in gps can be used as anti-theft tracking feature. Car navigation systems exist maybe 10-20 years already without mobile network provider support.
The answer is no, can we move along now? Thanks
by eee291
Oct 25 2020 2:53am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

It's a Bluetooth BMS not a GPS BMS :pancake: You are wrong. In JBD smart bms there is gps speed function available. Why not to use this gps option for tracking purpose? LOL :lol: Your smartphone has GPS not the BMS. You should first buy this BMS and only than claim about its GPS. Today not only sma...
by eee291
Oct 24 2020 12:42pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

Andrewol wrote:
Oct 24 2020 9:21am
eee291 wrote:
Oct 23 2020 2:22pm
It's a Bluetooth BMS not a GPS BMS :pancake:

You are wrong. In JBD smart bms there is gps speed function available. Why not to use this gps option for tracking purpose?
LOL :lol:

Your smartphone has GPS not the BMS.
by eee291
Oct 23 2020 2:22pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1641
Views: 214975

Re: bluetooth BMS?

It's a Bluetooth BMS not a GPS BMS :pancake: