Search found 406 matches

by Pajda
May 04 2021 4:19pm
Forum: Battery Technology
Topic: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)
Replies: 32
Views: 1154

Re: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)

Several problems were mixed together here. In my opinion, there may or may not be a connection between them. New marking from Samsung I think that the change in marking was aimed at simplifying the orientation in the released versions of cells for customers, nothing more. It was confusing to decide ...
by Pajda
May 04 2021 8:54am
Forum: Battery Technology
Topic: 40T, neodymium magnets, plasti dip cycle test
Replies: 168
Views: 13989

Re: 40T, neodymium magnets, plasti dip cycle test

I must say that I like to follow your inventive approach :)
by Pajda
May 03 2021 4:39pm
Forum: Battery Technology
Topic: Panasonic NCR21700T
Replies: 13
Views: 1235

Re: Panasonic NCR21700T

Unfortunately I put them into the shelf because more interesting cells (at least for me) arrived which fully occupies my testers. I have crucial problem with those cells that any fundamental production consistency cannot be expected at all here.
by Pajda
May 01 2021 5:23am
Forum: Battery Technology
Topic: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)
Replies: 32
Views: 1154

Re: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)

vanturion wrote:
Apr 28 2021 7:20pm
That's good to know, speaking of - will we need to wait for next Christmas for an updated cycle chart :wink:?
Good question, is there any worldwide public holiday around? The Samsung 30Q6 is already running in the tester. :wink:
by Pajda
Apr 29 2021 4:23pm
Forum: Battery Technology
Topic: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)
Replies: 32
Views: 1154

Re: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)

Is it fair to say they're now as good as VTC6, or still too early to tell? I think that only reason for going with VTC6 is its overall "production stability". In case of price and performace VTC6 is beaten by 30Q "141" or HG2 in majority of tests, but those two cells suffers wit...
by Pajda
Apr 28 2021 11:05am
Forum: Battery Technology
Topic: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)
Replies: 32
Views: 1154

Re: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)

For 2021 I can recommend to look for Samsung 30Q6 version. I got samples for testing recently and my results can confirm informations from Samsung "Introduction of New 18650 30Q6" presentation. This new model have slightly lower DCIR but more important there has been made a huge improvemen...
by Pajda
Apr 27 2021 1:48am
Forum: Battery Technology
Topic: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)
Replies: 32
Views: 1154

Re: Soliciting advice for 18650 cell choice in 2021 (+ 25R pack performance recap)

goatman is right, if you need battery cycler, you should pick EBC-A20. EBD-A20H is only DC load without charging function.

And thanks for correcting my ES nickname :)
by Pajda
Apr 16 2021 2:30pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

I had determined the correct color association, but then plugged them into pins 35/21 in the wrong order :roll: . There was also a bad connection between the +5V supply and the ME1302 encoder, so that wire had to be replaced. Those things are quite common. Another common problem is that the sin-cos...
by Pajda
Apr 16 2021 8:16am
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

I used the procedure outlined in one of the Sevcon manuals to determine the phase order of the motor we're using and which wire was sine and which was cosine. Once it was hooked up I followed the directions in another post on this forum and ran the encoder commision script. After graphing my voltag...
by Pajda
Apr 10 2021 7:22am
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

Here you can see all contactor settings in older DVT 1.10 (licenced), as I mentioned before DVT software evolved during times and newer versions have more or different setting possibilities. But you could alway be able to set all parameters thru the "console" if you know their ID. Also I m...
by Pajda
Apr 08 2021 3:58pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

Hmm.. you can also try to use small automotive 12V relay connected to Sevcon contactor output and so your Kilovac contactor will be switched by it on another 12V power supply. This will show you if there is problem with the current draw of your EV200. But more probably there is still some bug in the...
by Pajda
Apr 08 2021 1:43pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

That is a good point, can you please send us contactor setting window screen and what type of relay/contactor do you use?
by Pajda
Apr 05 2021 1:57pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

In my experience asking dealers, they only supply the software and license to paying customers, either buying the hardware or retaining them on an annual service contract. My impression was the goal is to reduce the value of secondhand units in circulation. I don't understand why there aren't freel...
by Pajda
Apr 05 2021 8:32am
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

Hi André, I think you mixed several problems together :) 1) IXXAT USB to CAN Interface is not connected with the Sevcon DVT software licences. You should get your DVT Customer licence for free from your local Sevcon representative. (I think that some eshops offer IXXAT Interface together with licenc...
by Pajda
Apr 04 2021 2:53pm
Forum: EScooters/EMotorcycles
Topic: how to program a sevcon gen4
Replies: 336
Views: 94495

Re: how to program a sevcon gen4

Hi, your approach described in points 1-3 seems to be good. When capturing the data try also his procedure: 1) spin the motor to the full drill power (ca 1000 rpm is enough) 2) start recording data 3) slowly decrease the speed to the full stop 4) stop recording data .. the idea is not to record cons...
by Pajda
Mar 28 2021 10:33am
Forum: Battery Technology
Topic: Tesla 4680 tabless battery
Replies: 20
Views: 1516

Re: Tesla 4680 tabless battery

flippy wrote:
Mar 28 2021 10:14am
i dont belive for a second that these cells will be comparable to tesla's chemistry, durabillty or reliabillty unless i have tested them and cracked a couple open.
Me too, they will be probably better than Tesla`s original production...
by Pajda
Feb 27 2021 3:45pm
Forum: Battery Technology
Topic: Panasonic NCR21700T
Replies: 13
Views: 1235

Re: Panasonic NCR21700T

TM3 cells from Panasonic at least until MY2021 does have capacity around 4800 mAh as new. So this result is good.
by Pajda
Feb 26 2021 4:08pm
Forum: Battery Technology
Topic: Panasonic NCR21700T
Replies: 13
Views: 1235

Re: Panasonic NCR21700T

Can we have a discharge curve on them please? I think I can do that, do you have any special wish? It will take some time. My opinion is that this cell is not much interesting, for applications up to 1C countinuous discharge, today choice no.1 is Samsung INR21700-50E (50E2). If you really need 3C c...
by Pajda
Feb 24 2021 3:51pm
Forum: Battery Technology
Topic: Panasonic NCR21700T
Replies: 13
Views: 1235

Re: Panasonic NCR21700T

Finally yesterday they arrived. They are definitelly not Panasonic originally made as NCR21700T but some hand-made work. There is no bar code on the can. They seems to be cells removed from TM3 battery pack as there is visible removed UWB aluminium wire bond. Also the initial parameters are comparab...
by Pajda
Feb 14 2021 7:48am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 515
Views: 60271

Re: Li-ion cells cycle ageing

This week I finally managed to continue the 5C torture test. So there is ca one month pause after 150 cycles of VTC6 and 200 cycles of 30Q. No significant recovery visible.
by Pajda
Feb 11 2021 7:58am
Forum: Battery Technology
Topic: Panasonic NCR21700T
Replies: 13
Views: 1235

Re: Panasonic NCR21700T

Thanks for reminding me, still somewhere in transit :(
by Pajda
Jan 10 2021 1:56pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 515
Views: 60271

Re: Li-ion cells cycle ageing

For those who are awaiting another data for "5C cycle life torture test", I had to recently break the test for at least 14 days due to the usage of room where the test is performed. Also small teaser from cold storage calendar life test - Samsung 29E7 after one month storage at 100 % SoC i...
by Pajda
Jan 02 2021 4:08pm
Forum: Battery Technology
Topic: Ebike Battery Capacity Ratings
Replies: 5
Views: 234

Re: Ebike Battery Capacity Ratings

For a new Samsung 35E you should always count with minimum: 3350 mAh @ 12.2 Wh as nominal capacity (100 % DoD at 0.2C rate discharge), nominal capacity above 3400 mAh @ 12.4 Wh is rare.
by Pajda
Jan 02 2021 5:59am
Forum: Battery Technology
Topic: Panasonic NCR21700T
Replies: 13
Views: 1235

Panasonic NCR21700T

Do you have experience with this NCR21700T model from "Panasonic"? Is it fake or rewrap of 21700A with welded cap on plus terminal or genuine one? https://www.aliexpress.com/af/NCR21700T.html?d=y&origin=n&SearchText=NCR21700T&catId=0&initiative_id=SB_20210102025413 I ordere...
by Pajda
Dec 28 2020 7:29am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 515
Views: 60271

Re: Li-ion cells cycle ageing

-25 °C isn´t it much ? Specifications are usually down to -20 °C. Yes it it but it is air temperature which oscilates due to the cheap kitchen freezer regulator hysteresis. I suppose that the temperature of the cells in the box will be relatively stable and definitelly higher than -20°C. It is comm...