Search found 2041 matches

by parabellum
Jun 22 2018 2:40pm
Forum: Motor Technology
Topic: Sensorless at standstill, development updates and status
Replies: 54
Views: 3032

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: 863

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: 863

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: 831
Views: 46605

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: 831
Views: 46605

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: 402

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: 1703

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: 630
Views: 38690

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: 630
Views: 38690

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: 489

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: 863

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: 402

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: 572

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: 402

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: 572

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: 630
Views: 38690

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: 1703

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: 135
Views: 18459

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...
by parabellum
Jun 15 2018 10:38pm
Forum: Motor Technology
Topic: Building a 100% DIY ESC for motors
Replies: 34
Views: 1703

Re: Building a 100% DIY ESC for motors

thorlancaster328 I would go trough Arlo's treads, all of them, time you have waiting for parts, there are a lot of underwater rocks you could eliminate, without burning thousands of USD on components to get there. If you get Highhopes to look at your project, he can provide you a huge short-cut to s...
by parabellum
Jun 15 2018 10:52am
Forum: Resources & EV Related Parts and Services
Topic: Aliexpress. How does it work and what to expect?
Replies: 2
Views: 282

Aliexpress. How does it work and what to expect?

I am new to aliexpress and many specifics are new to me, after using ebay and amazon. I think, there is a need to have some compilation of things to expect and experiences to share about this platform. 1 thing I noticed is a supper slow and funny shipping, not corresponding to options you have avail...
by parabellum
Jun 13 2018 8:18am
Forum: Battery Technology
Topic: My 38kw, 138v, 3.8kwh LTO Battery
Replies: 26
Views: 1464

Re: My 38kw, 138v, 3.8kwh LTO Battery

flippy wrote:
Jun 13 2018 3:15am
put a piece of painters tape on the cell, IR meters dont like reflective surfaces so the temperature wont read right. reading the tape helps a lot.
Black permanent marker is thinner layer, no trapped air inside, temp changes response and accuracy is higher.
by parabellum
Jun 13 2018 12:10am
Forum: Battery Technology
Topic: My 38kw, 138v, 3.8kwh LTO Battery
Replies: 26
Views: 1464

Re: My 38kw, 138v, 3.8kwh LTO Battery

I mean horizontally on top of the plate like I did but in 4 straight lines on some raisers like you say. ABS vicat is 105C and board will probably get there without any heat sink, or you remove 1 resistor and it probably will be OK then.
by parabellum
Jun 12 2018 11:05pm
Forum: Items for Sale - Used
Topic: Panosonic 25ah Prismatic cells for sale $28
Replies: 69
Views: 4037

Re: Panosonic 25ah Prismatic cells for sale $22

Hi Eric. 1.13"/cell looks right, where array starts to hold in 1 peace without cells sliding on each other, thanks. Can you suggest a charge rate and max. charge rate for those cells? P.S. I think it will not harm to add all new findings in the first post, like compression width, DCR and all relevan...
by parabellum
Jun 12 2018 1:21pm
Forum: Battery Technology
Topic: My 38kw, 138v, 3.8kwh LTO Battery
Replies: 26
Views: 1464

Re: My 38kw, 138v, 3.8kwh LTO Battery

What about fitting them horizontally in 4 lines? Printed studs could get to hot in worst case scenario, vicat temp of PETG (I used to print in) is ~80C, boards get over 90C (with heat sinking to terminal) hotter if free standing. What type of connectors will you use? Are there some bolts already you...