Search found 102 matches

by multifrag
Mar 22 2019 5:02pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

Hello! Friends, tell me, please, have you encountered the problem of reading and changing data in the BMS from a computer? In my PC version of the software, the first tab with cells info works fine, but if I try to do a calibration on the third tab or read the data on the second tab, I get a connec...
by multifrag
Mar 19 2019 9:25am
Forum: Battery Technology
Topic: Looking for 1s custom size LiPo battery
Replies: 0
Views: 91

Looking for 1s custom size LiPo battery

I've already tried aliexpress. Got a battery close to required size, but Wh/l is lower than the battery it was suppose to replace. Right now my device uses ''653850 samsung phone cell'' from 2012. It has 5Wh and 381.7Wh/l. The battery I received from aliexpress was suppose to be 8.9Wh and 555Wh/l, b...
by multifrag
Mar 15 2019 5:28pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

angusinalberta wrote:
Mar 15 2019 2:34pm
Xiaoxiang V2.1.1022 screenshot:
Screenshot_2019-03-15-11-17-13sm.png
Anyone know what the values mean?
Your series voltage is not very uniform. Mine is with in 0.03V and I get 93 for Voltage uniformity.
Check yours in Battery state/ Battery Voltage.
by multifrag
Mar 08 2019 7:43am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

flippy wrote:
Mar 08 2019 4:56am
multifrag wrote:
Mar 07 2019 6:59pm
Are there any benefits over the Xiaoxiang V2.1.1022 version? Your posted app didn't want to connect to my bms, but the interface was not as convenient as the Xiaoxiang.
can you post that version?
I've attached the .apk in 7z archive.
by multifrag
Mar 07 2019 6:59pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

some buttons are chinglish but eveything else is quite litteraly chinese. the other app i posted is much better and does not show functions it does not support. Are there any benefits over the Xiaoxiang V2.1.1022 version? Your posted app didn't want to connect to my bms, but the interface was not a...
by multifrag
Feb 23 2019 1:37pm
Forum: Battery Technology
Topic: Can Sunkko spot welder be used to weld pure nickel strip onto another pure nickel strip?
Replies: 9
Views: 237

Re: Can Sunkko spot welder be used to weld pure nickel strip onto another pure nickel strip?

Works with 709A. Mine required all pulses and the knob at 6-7. Don't forget that you get higher power right at the machine. So if the hand-held tool doesn't have enough ''chooch'', just weld with the tips at the front of the machine. Thanks for your reply and suggestion. Please advise the thickness...
by multifrag
Feb 22 2019 5:23am
Forum: Battery Technology
Topic: Can Sunkko spot welder be used to weld pure nickel strip onto another pure nickel strip?
Replies: 9
Views: 237

Re: Can Sunkko spot welder be used to weld pure nickel strip onto another pure nickel strip?

Works with 709A. Mine required all pulses and the knob at 6-7. Don't forget that you get higher power right at the machine. So if the hand-held tool doesn't have enough ''chooch'', just weld with the tips at the front of the machine.
by multifrag
Feb 11 2019 6:39pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

Voltage reading are spot on, but current is 33% higher then measured(from 4-25A). I'm guessing it's a matter of adjusting the resistor value in the software
by multifrag
Feb 11 2019 5:50pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

Finished wiring the BMS, tested it and left it for a bit. Disconnected one of the temperature probes as I only required one and tried to do some discharge tests... At first there was no output power at all. After figuring that it's probably Cold temperature protection(probe disconnected gives -33C b...
by multifrag
Feb 07 2019 4:02pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

Future reference to people who want to use 3rd party serial adapter like FTD1232. Don't! The VDD is 10.4V. I was lucky and didn't burn my usb chipset in my laptop due to using USB isolator... The bluetooth module has an LDO that's tolerant to 24V. That's the reason why they don't care about higher ...
by multifrag
Feb 06 2019 5:39pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

Future reference to people who want to use 3rd party serial adapter like FTD1232. Don't! The VDD is 10.4V. I was lucky and didn't burn my usb chipset in my laptop due to using USB isolator... The bluetooth module has an LDO that's tolerant to 24V. That's the reason why they don't care about higher v...
by multifrag
Feb 03 2019 10:26am
Forum: Battery Technology
Topic: Real or fake samsung 25r's
Replies: 4
Views: 350

Re: Real or fake samsung 25r's

Try discharging it at 10/15/20A and see how it goes with temperature and capacity. Discharging at 1A for capacity is useless unless you're planing on building a battery with a lot of parallel cells.
by multifrag
Feb 03 2019 10:11am
Forum: Battery Technology
Topic: DIY 14S10P lasercut full wooden enclosure/cell holder
Replies: 21
Views: 857

Re: DIY 14S10P lasercut full wooden enclosure/cell holder

Why do you need a laser cut cell holder when hot glue would do the job? You're spotwelding them so it's not like you will be able to disassemble the pack easily for repairs. You're getting a battery bag as the main enclosure. I can understand if it would be done out of silicone to protect it from vi...
by multifrag
Jan 31 2019 3:34pm
Forum: Battery Technology
Topic: The "thermal management of LiPo" thread!
Replies: 102
Views: 8128

Re: The "thermal management of LiPo" thread!

Has anyone tried using 3M Novac to fully submerge batteries? That's an interesting idea. I wonder how much it costs. Something cheaper, like mineral oil or the lube oil made for hybrid car AC systems might also work (but flammable). Keeping it from leaking out would be the main challenge. You'd als...
by multifrag
Jan 31 2019 8:40am
Forum: Battery Technology
Topic: The "thermal management of LiPo" thread!
Replies: 102
Views: 8128

Re: The "thermal management of LiPo" thread!

Has anyone tried using 3M Novac to fully submerge batteries? There are some Datacenters and PC builds that use it to cool components. The fluids boiling point is 61°C, which is a bit high for batteries, but I'm pretty sure at least it has a lot of heat capture. https://www.youtube.com/watch?v=V7-QWm...
by multifrag
Jan 30 2019 5:46pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

I haven't received the board https://www.aliexpress.com/item/14S-Smart-Li-ion-Battery-PCB-board-Bluetooth-Mobile-BMS-for-48V-58-8VLi-Ion/32794186005.html?af=137322&aff_platform=aaf&cpt=1548846368885&afref=&dp=f1b8d8feda097857fc9841c1eaa66e6d&cv=47843&pvid=3ad7b246-d140-47d9-b011-e55c78fb1e8e&mall_a...
by multifrag
Jan 30 2019 6:10am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

I haven't received the board https://www.aliexpress.com/item/14S-Smart-Li-ion-Battery-PCB-board-Bluetooth-Mobile-BMS-for-48V-58-8VLi-Ion/32794186005.html?af=137322&aff_platform=aaf&cpt=1548846368885&afref=&dp=f1b8d8feda097857fc9841c1eaa66e6d&cv=47843&pvid=3ad7b246-d140-47d9-b011-e55c78fb1e8e&mall_af...
by multifrag
Jan 15 2019 1:31pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61472

Re: bluetooth BMS?

I have a 14s battery that needs a new BMS and was wondering if going Bluetooth route is worth it? The regular 14S 45A BMS sells for £12, while Bluetooth 60A is £37 or £30 for 30A version. The battery is used on BBS02. So it won't see much usage past 25A and 1.5KW. Is it worth paying 3 times more for...
by multifrag
Oct 21 2018 7:55am
Forum: Battery Technology
Topic: ULtra Compact 1800W charger + Eltek programming
Replies: 268
Views: 37509

Re: ULtra Compact 1800W charger + Eltek programming

I'm trying to figure out which of the 4 pins on the flatpack S are can L and H. I have flatpack HE working and used this image for pinout, but for flatpack S I can't find a similar image. Closest I could find is this and it looks like Can L and H are suppose to be pins 3 and 4. Just wanted to check ...
by multifrag
Sep 30 2018 5:18pm
Forum: E-Bike Technical
Topic: Intermittent hall sensor problem
Replies: 4
Views: 220

Re: Intermittent hall sensor problem

TommyCat wrote:
Sep 30 2018 4:00pm
Intermittent is the worst! :( Come to a stop or jerk at speed... I'd start with disconnecting the brake switches first...
I don't have any attached. The controller has no regen, so didn't bother modifying hydraulic brakes i already had installed
by multifrag
Sep 30 2018 4:47am
Forum: E-Bike Technical
Topic: Intermittent hall sensor problem
Replies: 4
Views: 220

Re: Intermittent hall sensor problem

What does the battery voltage do when this happens? Is it happening at any particular place in the ride? I mean, such that conditions during the ride at that point or just before it could be causing it? If it is a hall issue, and you actually have to wait for it to recover, then heat is a possible ...
by multifrag
Sep 29 2018 11:33am
Forum: E-Bike Technical
Topic: Intermittent hall sensor problem
Replies: 4
Views: 220

Intermittent hall sensor problem

I have occasions when the hub motor would just drive into halt or start to jerk while at speed. I figured it was one of the hall sensor going bad. Checked if they react to magnet polarity and all of them do. Checked the wiring for broken or loose wire. All seem to work with out a problem. That leave...
by multifrag
Aug 20 2018 4:28pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Around the world on a solar ebike
Replies: 119
Views: 7662

Re: Around the world on a solar ebike

What about a recumbent? It has a similar position and aerodynamic advantage over normal road bike position. You can pack it into a normal bicycle box. The only problem is stop and start is more difficult, but you can get used to it. Some recumbent even come with a tear shaped back end compartment T...
by multifrag
Aug 20 2018 4:00pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Around the world on a solar ebike
Replies: 119
Views: 7662

Re: Around the world on a solar ebike

"velomobile"?... Looking at the speed and distance covered by people touring in velomobiles, I couldn't help but notice that they were similar to what I was doing with an ebike except they didn't have a motor or batteries that needed constant charging. I even flew to Holland to test ride a Mango ve...
by multifrag
Jul 25 2018 2:13pm
Forum: Endless-Sphere Wiki
Topic: How many of you really use the wiki?
Replies: 69
Views: 8071

Re: How many of you really use the wiki?

It's a shame wiki platform didn't work out. It was a good tool to send newcomers for more info on the subject.