Search found 95 matches

by Okami
Jun 30 2020 1:39pm
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 173
Views: 35970

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

Hi, very nice and detailed build log. What caught my interest was - U said it is is registered as moped. Did u have to go individual test or u had different approach how to make it road legal? At least it doesnt seem to me like it was commercially made ebike/frame from start but I might be wrong, ju...
by Okami
Jun 29 2020 2:13pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 69
Views: 13752

Re: Neu 8057 6kW left hand drive hardtail with vesc and encoder

Wanted to say great topic and thanks for giving introduction to higher volt vesc as well. Too bad the uk based company who sells its logic board doesnt offer power stage part as well. Though from what I understand nowadays it is easy to order small component assembly in china and then add the big co...
by Okami
Jun 16 2020 11:22pm
Forum: Motor Technology
Topic: Powering Boosted Rev Motors
Replies: 2
Views: 169

Re: Powering Boosted Rev Motors

Figure out curent battery setup, then increase voltage x times.(by getting suitable controller for desired voltage/wattage)

This doesnt include boosted rev might have software limit, then previous statement isnt as true

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by Okami
Jun 10 2020 1:18pm
Forum: Battery Technology
Topic: internal resistance battery pack
Replies: 6
Views: 247

Re: internal resistance battery pack

Damn burning down house seems rough and i suppose that wasnt a joke. Well i think 10mOhm for 18650 cell is quite ok, i know older cells have it at like 30-40mOhm more or less. But yeh, depends on wiring and what device measures it. There was a discussion on how single device should be used for measu...
by Okami
May 21 2020 1:25pm
Forum: Battery Technology
Topic: Any lipo checker that is not powered only from first cell?
Replies: 17
Views: 452

Re: Any lipo checker that is not powered only from first cell?

Im following as well, almost messed up lipo once due to this

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by Okami
May 05 2020 12:35pm
Forum: E-Bike Non-hub Motor Drives
Topic: Slawek's angle grinder drive
Replies: 49
Views: 18129

Re: Slawek's angle grinder drive

Hi, very cool topic. Would have loved to see more details and info about the build!

Although the whole documentation and video was very good and detailed.

Planning on doing something similar myself, now im not sure if angle grinder reducer box I have chosen will fit for the job..
by Okami
Apr 28 2020 2:26pm
Forum: Items Wanted
Topic: [EU] 1500W, 36-48v, +500 RPM Hub motor with rim - Wanted
Replies: 0
Views: 483

[EU] 1500W, 36-48v, +500 RPM Hub motor with rim - Wanted

Hi, interested to buy 1500W hub motor with rim. Preferably rear mounted one. 1000W versions might be also worth to look at. Not sure if anyone has such available but will try my luck here. Missed a good deal on aliexpress with Eu shipping, now I have to either wait a month till restocking happens or...
by Okami
Apr 20 2020 5:16am
Forum: Motor Technology
Topic: Rewinding flipsky 80100 motor
Replies: 20
Views: 1639

Re: Rewinding flipsky 80100 motor

it's too nice weather :D I am out trail running instead of winding motors.. 10 turns of 2.5x1.25 will give kV 91 in delta and then copper fill is 50%, a 60% increase of copper from original winding :D Nice weather is good argument for spending time outside indeed. Why do u think more manufacturers ...
by Okami
Apr 19 2020 5:14pm
Forum: Motor Technology
Topic: Rewinding flipsky 80100 motor
Replies: 20
Views: 1639

Re: Rewinding flipsky 80100 motor

So did u manage to put the new winding?

And how much more copper+/- u got to add this time?

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by Okami
Apr 19 2020 4:57pm
Forum: Battery Technology
Topic: Why Measure Capacity by Discharge and not by Charge?
Replies: 33
Views: 1125

Re: Why Measure Capacity by Discharge and not by Charge?

@DogDipstick Some really good info u posted above.

I guess I will look into options to measure IR more precisely from now on.

Also wonderful feature to find out capacity in 15minutes time.

Made my understanding of batteries more j insightful for sure.

Sent from my ALE-L21 using Tapatalk

by Okami
Apr 12 2020 2:12pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 550

Re: Pack Cycle Life - Can you help with the math?

Yes it is possible. But never guaranteed, just too many interacting variables, stuff happens. A better approach might be to post it this way: "How can we maximize the odds that the pack will. . ."? You need a SoH% number as your defined EoL, the cells rarely drop off a cliff, capacity just keeps de...
by Okami
Apr 09 2020 5:21am
Forum: Battery Technology
Topic: Why Measure Capacity by Discharge and not by Charge?
Replies: 33
Views: 1125

Re: Why Measure Capacity by Discharge and not by Charge?

Some good points about WH / amp hour difference. Well lately ive been wondering how to include ambient temperature's effect on battery capacity as well. I forgot to mention I was riding in 10C (~49F) or below conditions, so a bit far from the ideal 25C. Maybe temperature also impacts why Ah and WH n...
by Okami
Apr 08 2020 2:36pm
Forum: Battery Technology
Topic: Why Measure Capacity by Discharge and not by Charge?
Replies: 33
Views: 1125

Re: Why Measure Capacity by Discharge and not by Charge?

Yeh, it starts to seem that way. Funny how I relied on such theoretical Wh estimate to calculate range before. It sure is convenient to know batteries WH amount right away than figure out voltage and amp hours for pack versus different voltage pack and its amp hours. Though when charging the charger...
by Okami
Apr 08 2020 12:59pm
Forum: Battery Technology
Topic: Why Measure Capacity by Discharge and not by Charge?
Replies: 33
Views: 1125

Re: Why Measure Capacity by Discharge and not by Charge?

Well, thinking about consumed energy, im more baffled to which measure I should calculate kilometers per pack. For data monitoring I have G.T. Power Watt meter ------ After a ride I get 7.4 Ah consumed (with 6s li-ion battery) but in terms of Watt Hours, I get 134 Wh consumed. If I multiply 7.4A X 2...
by Okami
Apr 04 2020 3:45am
Forum: Motor Technology
Topic: Rewinding flipsky 80100 motor
Replies: 20
Views: 1639

Re: Rewinding flipsky 80100 motor

Some very good info. Thanks for insights. Also very nice models, clear to see everything. In your opinion, what amperage can these 80 size motors do? Still using 6360-6370 size motors but wondering about amp limits they can do. I know this is purely depending on wiring, copper fill and other factors...
by Okami
Apr 02 2020 11:58am
Forum: Battery Technology
Topic: HUGE EMPTY Downtube/Craddle Battery Box with Keylock
Replies: 28
Views: 5395

Re: HUGE EMPTY Downtube/Craddle Battery Box with Keylock

Nice topic considering downtube cases.

Im facing similar dilemma now. Want something which holds about 60cells and is removable.

Your info u posted definately helped just not sure im ready to pay that sum for a case but it made me to look in the right direction.
by Okami
Mar 25 2020 12:31am
Forum: Battery Technology
Topic: Capacity Mapping (Optimal Charge-Discharge Voltages)
Replies: 99
Views: 30909

Re: Capacity Mapping (Optimal Charge-Discharge Voltages)

I've read batteries on sattelites are kept at around 3.9v.

It was said that this voltage is not too high and not too low.

Not sure to what chemistry batteries it was referred though.

More like li-ion variety for sure, not sure about its chemical structure

Sent from my ALE-L21 using Tapatalk

by Okami
Mar 09 2020 1:46pm
Forum: Motor Technology
Topic: What precharge system does Sevcon use?
Replies: 4
Views: 314

Re: What precharge system does Sevcon use?

Sounds good. Relay system would be great indeed.
by Okami
Mar 09 2020 11:34am
Forum: Motor Technology
Topic: What precharge system does Sevcon use?
Replies: 4
Views: 314

Re: What precharge system does Sevcon use?

So do u want to "repair" existing controller or "borrow the idea" and use the relay for different controller?



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by Okami
Mar 07 2020 12:16pm
Forum: Motor Technology
Topic: Does adding more cap to the DC bus on a controller help? Look in here for the answer.
Replies: 10
Views: 859

Re: Does adding more cap to the DC bus on a controller help? Look in here for the answer.

Thanks for clarifying. Yes, im pretty much noob about custom made brushless motor speed ontrollers but Shaman was the guy which made it more understandable for the common guy. Kudos to him for that. So seems like if developer is keen enough and spends his time to calculate components with the right ...
by Okami
Mar 07 2020 11:41am
Forum: Motor Technology
Topic: Does adding more cap to the DC bus on a controller help? Look in here for the answer.
Replies: 10
Views: 859

Re: Does adding more cap to the DC bus on a controller help? Look in here for the answer.

So is it possible to make your own snubbers or they have to be embedded on the pcb itself? Ive heard a few things about them but not much on how to make one, if the speed controller pcb design does not have it. Seems like major safety improvement, which has not been widely enough executed, at least ...
by Okami
Feb 19 2020 2:53am
Forum: Motor Technology
Topic: Mid-drive motors of 250W compared from a mechanical viewpoint
Replies: 1
Views: 637

Re: Mid-drive motors of 250W compared from a mechanical viewpoint

Well, it would be great to see their real performance vs weight and so on.

But as mentioned, if these are 250W versions their power is software limited, so not always possible to bypass this limitation.

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by Okami
Feb 17 2020 3:22pm
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 24
Views: 2629

Re: DIY Motor Dyno/load?

Nice to see some progress on dyno. I suppose with golden motor ones u mean these ones right: https://www.goldenmotor.com/frame-bldcmotor.htm They do seem fine, though I might look into some non branded ones as I think Golden Motors are putting some margin on them. Seems like gocarts are using them, ...
by Okami
Jan 08 2020 2:32pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 460
Views: 59156

Re: BOSS LEVEL CUSTOM SPOT WELDER

Ok, long story short - I thought my welder went dead when actually it was wire coming loose off the Lipo cell Tab. Due to difficulty soldering the wire back to lipo (because of going from 4s to 3s lipo), the new solder connection didnt stick very well and started coming off. I did think for a few mo...
by Okami
Nov 16 2019 2:34pm
Forum: Battery Technology
Topic: Generic-Chinese-Bluetooth-BMS-communication-protocol
Replies: 35
Views: 11219

Re: Generic-Chinese-Bluetooth-BMS-communication-protocol

A very nice surprise !!! Thank you very much bres55 for this Arduino sketch to read Chinese BMS :D Starting from your sketch for Mega or Uno, I made a version for an ESP8266 variant. The one I used is a ESP8266 DSTIKE DEAUTHER (+-13Euro) board with onboard OLED & Wifi. Possibilities are endless now...