Search found 195 matches

by jumpjack
Oct 11 2019 7:26am
Forum: Battery Technology
Topic: Charge 52V Dolphin with this MPT-7210A?
Replies: 11
Views: 1660

Re: Charge 52V Dolphin with this MPT-7210A?

Is there any tutorial/manual for this regulator? I read it is also for lithium, but cant find any screenshot showing charge curve or battery type.
by jumpjack
Sep 10 2019 9:11am
Forum: Battery Technology
Topic: Fuse Questions
Replies: 23
Views: 544

Re: Fuse Questions

rg12 wrote:
Sep 04 2019 7:52pm
I'm looking for a fuse that will blow when the current reaches 120A.
To know exact behaviour, currents and timings of a fuse, you have to study the curves in its datasheet. Fuses don't just "break", it's a matter of time and energy.
by jumpjack
Sep 10 2019 9:03am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1625
Views: 192853

Re: Thread for new battery breakthrough PR releases

New, longlife NCM battery (NCM532/AG) , thanks to new type of electrolyte and "artificial graphite (AG)": up to 5000 cycles at 1C and DoD100%, 1 year storage time without self-discharge:
http://jes.ecsdl.org/content/166/13/A3031.full
by jumpjack
Aug 01 2019 9:00am
Forum: E-Bike Technical
Topic: Kelly Controllers Configuration Program - a Definitive Translation
Replies: 23
Views: 5985

Re: Kelly Controllers Configuration Program - a Definitive Translation

Step 4 step4.PNG [3] Releasing Throttle Starts Regen: This option will use regeneration whenever the throttle is released. For example, free-wheeling down a hill will recharge the batteries whether the breaks are applied or not. Note however, that if this option is enabled, then it will be more dif...
by jumpjack
Jun 13 2019 9:21am
Forum: E-Vehicles General Discussion
Topic: Sinusoidal wave brushless motor controller
Replies: 20
Views: 5739

Re: Sinusoidal wave brushless motor controller

I also tried decoding the error codes, I obtained this picture: https://jumpjack.files.wordpress.com/2019/06/1524795894.png This BASIC source decodes the raw data into human readable error messages (if above picture is right): Sub conv(Data9Data10) Dim ErrorText(15) Dim ErrorNum(15) ​ ErrorText(0) =...
by jumpjack
Jun 13 2019 8:29am
Forum: E-Vehicles General Discussion
Topic: Sinusoidal wave brushless motor controller
Replies: 20
Views: 5739

Re: Sinusoidal wave brushless motor controller

using documentation available around and documwntation from Kelly, I was able to build this table: https://jumpjack.files.wordpress.com/2019/06/comandi-new.png It summarizes all serial commands I am aware of. I didn't start experimenting yet, anyway I'm going to do that using an ESP32 module rather ...
by jumpjack
Jun 13 2019 3:40am
Forum: Motor Technology
Topic: Kelly, CANBUS and Arduino
Replies: 8
Views: 1772

Re: Kelly, CANBUS and Arduino

Found something about Kelly usage of CANBUS protocol: http://www.oblibene.biz/userdata/shopimg/elektrolode/file/KBL%20User%20Manual.pdf Table 2: KBL Controller CAN Commands List (page 15) Any suggestion about USB/CANBUS module which could be used both on PC and on Arduino? I also received from Kelly...
by jumpjack
Jun 12 2019 3:24am
Forum: E-Vehicles General Discussion
Topic: Connection diagram of an advanced BMS in an EV
Replies: 0
Views: 478

Connection diagram of an advanced BMS in an EV

They were recently published two interesting documents describing in detail the connections of an "advanced" BMS inside an EV. "Advanced" because it does not just manage the cells, but the whole vehicle, thanks to several contactors and sensors. The BMS comes in two variants: modular (BMS-M12, older...
by jumpjack
Jun 12 2019 2:32am
Forum: E-Bike Technical
Topic: Random power cut issues
Replies: 4
Views: 400

Re: Random power cut issues

How can I usae CANBUS to read data from a kelly controller?
by jumpjack
Jun 11 2019 3:36am
Forum: Motor Technology
Topic: Power cut issues with Kelly KHB72701
Replies: 1
Views: 240

Power cut issues with Kelly KHB72701

The power arriving to my motor is sometimes cut down from nominal 5 kW to 4 kW, then 3kW, and eventually to 0.8 kW (10A at 80V). BUT Battery is full (80V for a 72V nominal battery). Cells are fine (lowest is at 3.3V, highest is 3.34V) Temperature can vary from 15°C to 35°C when problem arises. Motor...
by jumpjack
Jun 11 2019 3:17am
Forum: E-Bike Technical
Topic: Random power cut issues
Replies: 4
Views: 400

Random power cut issues

I am encountering some issues on my electric car since some months, and nobody here appears to be able to figure out what is going on, even the shop which sold it to me; they totally replaced the BMS and the service battery, thinking that they could in some way affect the electrical system of the ca...
by jumpjack
Aug 01 2018 4:38am
Forum: Battery Technology
Topic: Highest capacity 18650 cells
Replies: 68
Views: 7310

Re: Highest capacity 18650 cells

Hillhater wrote:
Jul 31 2018 5:52pm
jumpjack wrote:
Jul 31 2018 9:28am
If database on https://lygte-info.dk/ was public it would be possible to create a sparse chart showing various LVC values. Is there a method to access raw data?
?? All the data on lygte site is public accessable ?
I am talking of raw numbers, not charts.
by jumpjack
Jul 31 2018 9:28am
Forum: Battery Technology
Topic: Highest capacity 18650 cells
Replies: 68
Views: 7310

Re: Highest capacity 18650 cells

If database on https://lygte-info.dk/ was public it would be possible to create a sparse chart showing various LVC values. Is there a method to access raw data?
by jumpjack
Jul 30 2018 9:18am
Forum: Battery Technology
Topic: Highest capacity 18650 cells
Replies: 68
Views: 7310

Re: Highest capacity 18650 cells

So, what was the cut off voltage? This issue just came out in another thread, so I created this image which joins two different discharge curves, comparing a samsung cell with an unknown cell from https://www.powerstream.com/lithium-phosphate-charge-voltage.htm : https://jumpjack.files.wordpress.co...
by jumpjack
Jul 30 2018 4:02am
Forum: Battery Technology
Topic: my 18650 frame pack build
Replies: 32
Views: 3467

Re: my 18650 frame pack build

Indeed the INR18650-30Q charts looks very different fromt that on the site I found. Which means that each lithium cell management system must be calibrated for each specific cell variant. According to charts, discharging the cell on the site I found down to 2,5V would be like discharging an INR18650...
by jumpjack
Jul 30 2018 3:46am
Forum: Battery Technology
Topic: Nickel welding strips - current capability ??
Replies: 7
Views: 1348

Re: Nickel welding strips - current capability ??

The "unadequacy" of spot-welded nickel strips is an urban legend, just like venting hole of old A123 cells, which even led to building nickel strips with a hole to prevent hole from being covered! Useless holes in strips: http://jumpjack.files.wordpress.com/2013/05/barrette-a123.jpg Details: https:/...
by jumpjack
Jul 30 2018 3:34am
Forum: Battery Technology
Topic: Highest capacity 18650 cells
Replies: 68
Views: 7310

Re: Highest capacity 18650 cells

The real cycle life killer for many (not all) cells is high charge rates, especially high charge rates at low cell temperatures. Many cells, especially high capacity cells can be destroyed within a few dozend cycles at 0,5C charge at 0°C. The 35E is only good for 1A charge rate even at 20°C(!). Sou...
by jumpjack
Jul 30 2018 2:41am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1133
Views: 98823

Re: bluetooth BMS?

if you want to safe cells from touching each other then there are way more adequate solutions than this rubbish cell holders which really are only good for stationary application. I really don't get why you say that. Did you ever try them, or have just seen them in picture? the interconnecting nick...
by jumpjack
Jul 30 2018 2:25am
Forum: Battery Technology
Topic: my 18650 frame pack build
Replies: 32
Views: 3467

Re: my 18650 frame pack build

That's good. Now we need to know cycle life and balance over time. So you have some more work to do. Get to work. Cycle Life. i can get full 30Ah out of the pack if i charge to 4.20V and discharge to 2.80V. not that i do it every day, but for range tests i did that. i plan to charge to 4.10V. i don...
by jumpjack
Jul 29 2018 7:36am
Forum: Battery Technology
Topic: my 18650 frame pack build
Replies: 32
Views: 3467

Re: my 18650 frame pack build

WARNING! This pack is very nice... but it's just a "pack", it's not a "battery". This is a "pack" of cells: https://endless-sphere.com/forums/download/file.php?id=227817 Also this is just a "pack" of cells: https://endless-sphere.com/forums/download/file.php?id=237598 This is a "battery": https://ju...
by jumpjack
Jul 29 2018 7:21am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1133
Views: 98823

Re: bluetooth BMS?

IMG_0312.JPG This is a very dangerous - but common - method to build batteries, without any holder. Unfortunately, road vibrations will soon cause shortcircuits and falmes in such a battery. Always use holders! you may want to look at my battery build thread. i was only showing the nickle welding, ...
by jumpjack
Jul 28 2018 11:48am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1133
Views: 98823

Re: bluetooth BMS?

IMG_0312.JPG This is a very dangerous - but common - method to build batteries, without any holder. Unfortunately, road vibrations will soon cause shortcircuits and falmes in such a battery. Always use holders! That said... I didn't read the whole thread, but I read some other ones, and I see there...
by jumpjack
Jul 28 2018 11:23am
Forum: Battery Technology
Topic: Bluetooth 10-15s bms review
Replies: 41
Views: 5137

Re: Bluetooth 10-15s bms review

Sorry I don't get if somebody was able to reflash the firmware of this BMS.
I also don't understand where the Windows screenshots come from, I only found the Android app.
And finally, is this firmware compatible with this BMS? But where is the original sparkfun BMS? I can't find it.
by jumpjack
Apr 02 2018 1:42pm
Forum: Motor Technology
Topic: Kelly, CANBUS and Arduino
Replies: 8
Views: 1772

Re: Kelly, CANBUS and Arduino

thanks.
:(
by jumpjack
Apr 02 2018 10:22am
Forum: Motor Technology
Topic: Kelly, CANBUS and Arduino
Replies: 8
Views: 1772

Re: Kelly, CANBUS and Arduino

Anybody?