Search found 94 matches

by krlenjuska
Mar 14 2020 7:56am
Forum: Battery Technology
Topic: DIY Spot welder power- limiting factor?
Replies: 5
Views: 250

Re: DIY Spot welder power- limiting factor?

I have same electronics and everything works 100%. Just use 70mm2 secondary wire and dont worry. You will get 1.4 -1.8V with 2 full turns and this is enough for good spot welds. One more thing - always use 20ms at start and increase current when you test welds. If your nickel strip is thick you can ...
by krlenjuska
Jan 06 2020 10:56pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 34
Views: 4330

Re: JP spot welder open source

Has anyone decided to build a batch of these for sale. I'd really like to use this welder but do not want to go to the trouble of fabricating one. Or is there a recommended alternative for someone who just wants to purchase a welder similar to the JP spot welder? I have all parts for 10pcs but simp...
by krlenjuska
Dec 01 2019 6:08pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1334
Views: 162782

Re: bluetooth BMS?

zipoman wrote:
Nov 30 2019 4:42pm
Yes, it is possible change settings only with app. But i cant set max voltage 3,5V for LFP, min 3.65V - I must set this voltage by pc. For li-ion I think no problem with 4.1V max voltage, problem is low value.
Thanks i ordered 6S-10S version.
by krlenjuska
Nov 29 2019 2:31pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1334
Views: 162782

Re: bluetooth BMS?

I have 1 question about JBD bluetooth BMS.
Is android app enough for settings like charging voltage, balance start voltage and discharge cutoff voltage? I want to charge my pack to 4.10V. I dont wanna buy UART module if i dont need it.

Thanks!
by krlenjuska
Nov 17 2019 5:57am
Forum: Battery Technology
Topic: BMS for 4S30P battery pack
Replies: 11
Views: 1096

Re: BMS for 4S30P battery pack

You have smart bms. Check this thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=88676 https://www.aliexpress.com/item/33043068582.html?spm=2114.12010612.8148356.23.55a53de2ayFwtM Check this store also: https://www.aliexpress.com/store/1379203?spm=a2g0o.detail.1000002.2.15197614ZnM5oS ...
by krlenjuska
Nov 16 2019 5:59am
Forum: Battery Technology
Topic: BMS for 4S30P battery pack
Replies: 11
Views: 1096

Re: BMS for 4S30P battery pack

You have smart bms. Check this thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=88676 https://www.aliexpress.com/item/33043068582.html?spm=2114.12010612.8148356.23.55a53de2ayFwtM Check this store also: https://www.aliexpress.com/store/1379203?spm=a2g0o.detail.1000002.2.15197614ZnM5oS
by krlenjuska
Nov 16 2019 5:34am
Forum: Battery Technology
Topic: BMS for 4S30P battery pack
Replies: 11
Views: 1096

Re: BMS for 4S30P battery pack

You asked for reccomendation from your list - i think second is good.

https://www.aliexpress.com/item/3283793 ... 4c4dP1O6H3
by krlenjuska
Nov 15 2019 8:16pm
Forum: Battery Technology
Topic: BMS for 4S30P battery pack
Replies: 11
Views: 1096

Re: BMS for 4S30P battery pack

I used second one for acudrills - without any issues so far.
by krlenjuska
Nov 15 2019 6:53pm
Forum: Battery Technology
Topic: BMS for 4S30P battery pack
Replies: 11
Views: 1096

Re: BMS for 4S30P battery pack

Probably not because you dont need better one - this bms can handle 10A without isues.
BTW why 30P battery? What is this for?
by krlenjuska
Nov 15 2019 3:40pm
Forum: Battery Technology
Topic: BMS for 4S30P battery pack
Replies: 11
Views: 1096

Re: BMS for 4S30P battery pack

I use this for accudrill battery repair and works just fine.

https://www.aliexpress.com/item/3285201 ... 4c4dJcgbsF
by krlenjuska
Nov 12 2019 1:13pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 34
Views: 4330

Re: JP spot welder open source

Riba - can i use 1N4004 diode instead of 1N4001? Only difference is voltage if im not wrong.
by krlenjuska
Nov 07 2019 5:35pm
Forum: Battery Technology
Topic: How to change cutoff voltage of the controller
Replies: 7
Views: 647

Re: How to change cutoff voltage of the controller

Yes, they are series in the schematic as well--they're just using two paralleled resistors in each case to get the specific resistance they wanted. Yeah they are in series in my case also. 1.5kΩ+10kΩ - 11.5kΩ total. My controller stopped at 20.25V. I will now try use different value of smaller resi...
by krlenjuska
Nov 06 2019 7:14am
Forum: Battery Technology
Topic: Spot welder
Replies: 7
Views: 656

Re: Spot welder

by krlenjuska
Nov 05 2019 2:07pm
Forum: Battery Technology
Topic: How to change cutoff voltage of the controller
Replies: 7
Views: 647

Re: How to change cutoff voltage of the controller

Yeah i figured that also - those 2 resistors are responsible for voltage cutoff. Will try to test with my variable PS and after that i will use math to change resistor value. Only strange thing - it seems to me those 2 resistors are in series in my case - not parallel. Will check later with multimet...
by krlenjuska
Nov 04 2019 3:36am
Forum: Battery Technology
Topic: How to change cutoff voltage of the controller
Replies: 7
Views: 647

How to change cutoff voltage of the controller

Controller is chinese YK31C 24V 500W. 6S battery - cutoff voltage at 3.45 is to high. Panasonic NCR18650BD have lot of energy stored between 3.45 and 3.2. How to change cutoff voltage from 20.5V to 19.2V ? Controller have IC with this marks 339 ST MZH9830 LM339 if im not wrong. I guess (with my smal...
by krlenjuska
Oct 24 2019 5:29pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 34
Views: 4330

Re: JP spot welder open source

I recieved pcbs from JLCPCB. 13 days from order day. This is record for me when i order something from China. Also i should take over other components tomorrow - arrived from mouser to my local electronics store. After that i need to make busbars and cables with electrode holders/electrodes. Also i ...
by krlenjuska
Oct 23 2019 3:12pm
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 37
Views: 2171

Re: Testing the internal resistance of a li ion cell and making determinations

So in reality voltage drop test can give us only DC resistance results - if this is accurate. Also should we measure this at 4.2 voltage or at 3.7V? Some semi-pro tool like vapcell yr1030 will measure AC resistance which is totaly different thing. Which one is important for us? Probably first one - ...
by krlenjuska
Oct 22 2019 7:20am
Forum: Battery Technology
Topic: Boston-Power Swing 5300 Li-ion cell test
Replies: 129
Views: 20120

Re: Boston-Power Swing 5300 Li-ion cell test

I just found 4 Sonata 4400mAH in some ASUS battery pack. Big suprise for me :)
First time for me to see something like this.
by krlenjuska
Oct 21 2019 4:10pm
Forum: Battery Technology
Topic: Nkon not shipping outside EU?
Replies: 8
Views: 938

Re: Nkon not shipping outside EU?

I just sent an email - there is no shipping options for Serbia anymore. Dont know why.
by krlenjuska
Oct 16 2019 8:10am
Forum: Battery Technology
Topic: MOT Spot Welder for 18650 Li-ION batteries
Replies: 6
Views: 565

Re: MOT Spot Welder for 18650 Li-ION batteries

I just tested my bigger transformer (1750VA) and its working just fine. I tested it on pure nickel 0.1 and 0.15 and welds are very good. I dont have thicker nickel right now but will test in the future. This transformer should be enough for 0.25 nickel IMO - maybe 0.3. Welds are clear and strong. I ...
by krlenjuska
Oct 14 2019 10:36am
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 34
Views: 4330

Re: JP spot welder open source

riba2233 wrote:
Oct 12 2019 10:46am
You can use anything from 0.25 w above.
Can i use some other similar mosfets? Cant find 1324 at my local stores.

EDIT: never mind i managed to find it.
by krlenjuska
Oct 11 2019 3:56pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 34
Views: 4330

Re: JP spot welder open source

I ordered PCBs and all components - will try to make this :) Great to hear, please post your progress and pictures here 8) Most difficult thing to do for me is to program pic controller - never tried this :) It's simple once you have a programmer like pickit 2 or 3 with their own software, just con...
by krlenjuska
Oct 10 2019 1:28pm
Forum: Battery Technology
Topic: JP spot welder open source
Replies: 34
Views: 4330

Re: JP spot welder open source

riba2233 wrote:
Oct 10 2019 1:22pm
krlenjuska wrote:
Oct 10 2019 12:54pm
I ordered PCBs and all components - will try to make this :)
Great to hear, please post your progress and pictures here 8)
Most difficult thing to do for me is to program pic controller - never tried this :)