Search found 2048 matches

by parabellum
Jun 27 2018 11:09pm
Forum: Electric Watercraft
Topic: Electric Surf Board
Replies: 638
Views: 148625

Re: Electric Surf Board

What about these Flier ESCs? This one seems crazy to me http://www.fliermodel.com/en/prc-show.asp?id=684 22S and 800A are still 31kW if we divide the specs in half Or this one https://www.ebay.es/itm/400A-Boat-ESC-W ... SwzJhZ0Rgt Is still 11kW with the same specs halved I think, Luke tried 22s 400...
by parabellum
Jun 27 2018 10:47pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61457

Re: bluetooth BMS?

Dui, ni shuo de dui wrote:
Jun 27 2018 9:14pm
The only time where I see the BMS heating is at the end of the charge, I guess that is whenever its doing the balancing.
Do you know what mosfet's are used in your BMS? Link to the BMS?
by parabellum
Jun 27 2018 8:53am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61457

Re: bluetooth BMS?

I did connect a battery to BMS yesterday and balanced a 24s battery, which happened to have 1 cell low or at least BMS thinks so. My observation: If more then 13 cells are draining, BMS gets to 60C and switches a bunch of lower cells off to cool, at 45C it resumes on those cells. At ~12-13 cells dra...
by parabellum
Jun 26 2018 11:35am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 936

Re: Parallel BMS for 4 x 12v start battery in Parallel

Thank you so much..... as thought..... I'll Parallel and use the other product for the separate bleed circuit! Perfect! Thank you! :) Just for clarification and deeper understanding of the problem. You see the chronology of events of 1 BMS is like following. 1)BMS measures individual cell voltages,...
by parabellum
Jun 26 2018 8:43am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61457

Re: bluetooth BMS?

i am still pretty uncomfortable running 200+ amps tru that BMS. i got the 300A 32S version but those currents makes me a bit "yikes". preventive upgrading to better mosfets something i should consider? i dont care about heat as the controller and bms is cooled by a fan and the battery is way overki...
by parabellum
Jun 26 2018 12:15am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61457

Re: bluetooth BMS?

Hey what is the balance current while balance charge ? app work fine ? Luk Default setting is at 200mA. App works stable, but I only used it for settings, there is a bug in changing values in portrait mode, you must turn to landscape to be able to write. It was frustrating for 5 min before I figure...
by parabellum
Jun 23 2018 2:19pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 936

Re: Parallel BMS for 4 x 12v start battery in Parallel

In normal conditions, yes, any balancing circuit will. Those A123 are beasts and do not go out of balance easily anyway. But in your case, there are 2 scenarios: 1)Your GEN is holding charge at <V than needed to hold balancer triggered continuously or you can make that happen in some way (diodes etc...
by parabellum
Jun 22 2018 2:40pm
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 78
Views: 4919

Re: Sensorless at standstill, development updates and status

Cool. Will it be discrete chip managing position or all going into main brain unit?
by parabellum
Jun 22 2018 2:28pm
Forum: Battery Technology
Topic: MAKING A CHEAP BATTERY PACK WITH CHINESE CLONES? IMR AKA LMO BATTERIES 18650
Replies: 38
Views: 1097

Re: MAKING A CHEAP BATTERY PACK WITH CHINESE CLONES? IMR AKA LMO BATTERIES 18650

That's gotta have some thick stuff! I know when I do 3 welds the bottom of the battery gets pretty hot at 6xx amps... That is the interesting part, with higher Amps less energy is used to make better weld. K-weld is energy based spotwelder, you adjust the Joules you want in a weld, and pulse is red...
by parabellum
Jun 22 2018 10:42am
Forum: Battery Technology
Topic: MAKING A CHEAP BATTERY PACK WITH CHINESE CLONES? IMR AKA LMO BATTERIES 18650
Replies: 38
Views: 1097

Re: MAKING A CHEAP BATTERY PACK WITH CHINESE CLONES? IMR AKA LMO BATTERIES 18650

mightbaal wrote:
Jun 22 2018 2:07am
709A (mine) puts out 650A on the highest setting
That is not optimal, in KWeld tread they work around 1200A pulses for .15-.2 tabs and striving for up to 2000A for thicker Nickel. They are shorter but results are better then long low current discharges.
by parabellum
Jun 22 2018 10:03am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61457

Re: bluetooth BMS?

Got the android APK in English and Chinese today, in my spam folder and the BMS works and beeps and shows a bunch of strange numbers, voltages, warnings, settings and I am a happy man now! :D I was getting mad yesterday, trying other versions of xiaoxiang without any success. This one has different ...
by parabellum
Jun 21 2018 9:45pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 949
Views: 61457

Re: bluetooth BMS?

Yeey, just got my 300A 8-24S BMC from IC GOGOGO, now begging them to send me a android APK. I have noticed, there are different versions of BMS and APK discussed in this tread. Can someone link, upload or send me an version that could work on my, please? :roll: https://www.aliexpress.com/item/Smart-...
by parabellum
Jun 21 2018 1:11pm
Forum: Battery Technology
Topic: 3d printer filament in battery pack
Replies: 12
Views: 452

Re: 3d printer filament in battery pack

john2364 wrote:
Jun 21 2018 12:14pm
I am considering adding some air vents my only concern is water in the battery pack. could be more exposed to moisture though.
I mean air circulation inside the pack and between battery and enclosure that can get exposed to sun.
by parabellum
Jun 21 2018 12:25pm
Forum: Motor Technology
Topic: Building a 100% DIY ESC for motors
Replies: 34
Views: 2034

Re: Building a 100% DIY ESC for motors

thorlancaster328 wrote:
Jun 17 2018 2:22pm
What do you mean by topology?
Board design is one of most critical steps at those and any power levels.
Known to work BOM will eventually fail at some level on a perfboard or bad board design.
by parabellum
Jun 21 2018 12:08pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 739
Views: 46168

Re: Tesla Model 3

billvon wrote:
Jun 21 2018 11:20am
In any case, I would guess they would mine something else. Or get a different job. Or stop working.
Or start starving on hunger and misery.
Or take guns and start killing people for food.
It all happened on African continent many times and ended in misery and blood bath.
by parabellum
Jun 21 2018 10:24am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 739
Views: 46168

Re: Tesla Model 3

I wonder what happens to those kids in Africa if Cobalt demand suddenly disappears.
by parabellum
Jun 21 2018 9:43am
Forum: Alternative Energy
Topic: Liquid Metal Battery for grid storage/solar time-shift
Replies: 6
Views: 628

Re: Liquid Metal Battery for grid storage/solar time-shift

KalSteve wrote:
Jun 21 2018 2:23am
The Redflow batteries in Australia look like they are working OK, with a few relatively minor teething problems.

https://redflow.com/
Aren’t they flow batteries and not molten salt.
by parabellum
Jun 21 2018 8:29am
Forum: Battery Technology
Topic: MAKING A CHEAP BATTERY PACK WITH CHINESE CLONES? IMR AKA LMO BATTERIES 18650
Replies: 38
Views: 1097

Re: MAKING A CHEAP BATTERY PACK WITH CHINESE CLONES? IMR AKA LMO BATTERIES 18650

mightbaal wrote:
Jun 21 2018 2:26am
Any idea what I am doing wrong?
Getting better!
Only remark: You do not need 2 paralleling strips, on 1 serial connection. It does not harm but no added benefit.
by parabellum
Jun 21 2018 7:26am
Forum: Battery Technology
Topic: 3d printer filament in battery pack
Replies: 12
Views: 452

Re: 3d printer filament in battery pack

what about the sun? depending on the color of the pack it could get very hot from direct sunlight. i have seen PLA melt in the back of a car on a sunny day. PETG is reasonable choice, but I would try to get no direct sun impact on the cells and allow some convectional air circulation if possible. P...
by parabellum
Jun 21 2018 7:01am
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 936

Re: Parallel BMS for 4 x 12v start battery in Parallel

yes, from the generator after startup. If the bleed circuits can handle it, but I'm thinking that the voltage regulator will also limit the current from the generator charging system. I have not used those BMSs you linked but, usually you can parallel them for discharge. I would keep all battery bl...
by parabellum
Jun 20 2018 5:04pm
Forum: Battery Technology
Topic: 3d printer filament in battery pack
Replies: 12
Views: 452

Re: 3d printer filament in battery pack

john2364 wrote:
Jun 09 2018 12:27pm
Is it reasonable to assume that the battery pack will not get above 80c unless there is something seriously wrong with it?
It is reasonable to design that your pack never gets over 60C.
by parabellum
Jun 20 2018 4:54pm
Forum: Battery Technology
Topic: Parallel BMS for 4 x 12v start battery in Parallel
Replies: 25
Views: 936

Re: Parallel BMS for 4 x 12v start battery in Parallel

What is your plan for charging them, with BMS you linked?
by parabellum
Jun 19 2018 3:04pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 739
Views: 46168

Re: Tesla Model 3

The new 21700 cells have less cobalt in the cathode and its replaced with nickel, From what I gather it raises the energy density of the cell but has less reliability, so you can say theres a cost vs safety factor and the higher capacity cells look more attractive on paper but in real life not so m...
by parabellum
Jun 17 2018 12:11am
Forum: Motor Technology
Topic: Building a 100% DIY ESC for motors
Replies: 34
Views: 2034

Re: Building a 100% DIY ESC for motors

Topology.
by parabellum
Jun 15 2018 11:04pm
Forum: E-Bike General Discussion
Topic: GPS tracker
Replies: 136
Views: 19693

Re: GPS tracker

Why not just use some 10-20USD GPS tracker and cheap cel plan? I have bought several in 2011 and still use them , they send coordinate via sms (easily recognized by android phone), can map them, programmable by sms and you can establish voice connection any-time to hear whats going on. If G sensor f...