Search found 515 matches

by kdog
Feb 26 2019 5:36am
Forum: Battery Technology
Topic: BMS got heated while discharging
Replies: 3
Views: 202

Re: BMS got heated while discharging

What is the max draw on your controller? maybe you were pulling 30amps or something and it just got hot and died. Also cheap bms's have lots of issues so best use them at about 2/3 their stated max continuous draw.
by kdog
Feb 22 2019 5:06pm
Forum: Battery Technology
Topic: 2 transformers in parallel for more current?
Replies: 1
Views: 94

Re: 2 transformers in parallel for more current?

you can do it, there is info here on ES and also on the web about it. the MAIN thing is to get the phases around the right way (both primary and secondary) otherwise it'll be a dead short. I thought about it for a while but then opted to rewind a bigger single transformer. it was foil wound- pretty ...
by kdog
Feb 22 2019 1:52pm
Forum: E-Bike Technical
Topic: Nickel Strip ratings
Replies: 14
Views: 368

Re: Nickel Strip ratings

Spot welding repository,.. :es: first page
by kdog
Feb 17 2019 1:52pm
Forum: Battery Technology
Topic: 84V pack not reaching full charge
Replies: 14
Views: 363

Re: 84V pack not reaching full charge

Two ways that I know of,
Heat the cell till glue softens a slide it out.
Methylated spirits releases the glue like magic. Just a few drops will do, and don't get it on the other cells or it will all fall apart.
by kdog
Feb 14 2019 4:58am
Forum: E-Bike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 5052
Views: 497030

Re: Adaptto Mini-E/Max-E Owner's Thread

Pretty sure it balances when turned on, and, over the balance threshold voltage as set in BMS settings (adjustable ). 'Balancing'shows up on the display when you check the battery screen during this time.
by kdog
Jan 29 2019 10:38pm
Forum: E-Bike General Discussion
Topic: Recognize this?
Replies: 12
Views: 485

Re: Recognize this?

L is folded version of R. Looks like a pos, would ride like it too.
by kdog
Jan 29 2019 6:59pm
Forum: Battery Technology
Topic: Batteries not charging or powering bike. Why?
Replies: 8
Views: 230

Re: Batteries not charging or powering bike. Why?

As usual, AW is all over it, I'd listen to him. Write down and post all individual cell group voltages, then check that respective balance wire have this same voltage(carefully,) total pack voltage before and after bms, pics of the battery at cell level both sides would help. Maybe measure charger o...
by kdog
Jan 15 2019 7:42am
Forum: Battery Technology
Topic: BMS modding for more current
Replies: 18
Views: 1661

Re: BMS modding for more current

Hey eg thanks for this thread. I'm just at the beginning of looking to modify some bms's to make them more reliable. Not so much to increase amps but to better current sharing etc. I've had a few fail bc one or two mosfets basically do 90%of the work. In fetchers pics above, are the mosfets stacked ...
by kdog
Jan 12 2019 7:15pm
Forum: Motor Technology
Topic: Room temperature superconductors
Replies: 7
Views: 394

Re: Room temperature superconductors

How do you maintain 24million psi except in a diamond anvil? -135deg is a breeze compared to that!
by kdog
Jan 08 2019 2:49am
Forum: E-Vehicles General Discussion
Topic: Very high-powered drag braking to control speed while pedaling
Replies: 22
Views: 940

Re: Very high-powered drag braking to control speed while pedaling

Have a big red button that deploys chalos tyre! :lol: seriously you are getting way too in depth about a thing which is really not that difficult. Get a dd motor, a controller with variable Regen and your done-oh remember to turn it off when you want to go slow on the flat. Now go and build it, and ...
by kdog
Jan 07 2019 5:33am
Forum: E-Vehicles General Discussion
Topic: Very high-powered drag braking to control speed while pedaling
Replies: 22
Views: 940

Re: Very high-powered drag braking to control speed while pedaling

Not quite sure I get your problem entirely (tldr), but if you've ever tried riding a DD ebike without power I think you'll find yourself at acceptably low speed on the flat. As for down hill, Regen even with pedalling will result in the same low speed on most hills. If not... Turn it up (the Regen t...
by kdog
Jan 05 2019 5:05pm
Forum: Battery Technology
Topic: BMS Replacement - Ezee Battery
Replies: 1
Views: 159

Re: BMS Replacement - Ezee Battery

did you try aliexpress, pretty sure clrd are selling on aliexpress.
by kdog
Dec 13 2018 11:35pm
Forum: E-Bike Technical
Topic: Motor growl problem
Replies: 9
Views: 449

Re: Motor growl problem

I reckon you've blown some fets. Open the end of the controller and have a smell/look. A friends (kt cont) did exactly this after turning up his regen. Very suspicious! I don't think kt have figured out how to control the Regen currents precisely-ive heard of a few dying after Regen related events. ...
by kdog
Dec 09 2018 7:02am
Forum: Battery Technology
Topic: Why large parallel connection in battery packs ?
Replies: 9
Views: 504

Re: Why large parallel connection in battery packs ?

If you series first, then parallel the strings, you need a bms for each string. So #P x more bmss = lots more wires. Then there's all the problems you'll have when one bms shuts down. Discussion on this currently on another thread.
by kdog
Dec 04 2018 2:46pm
Forum: E-Bike Technical
Topic: BMS help for MJ1 cells
Replies: 4
Views: 252

Re: BMS help for MJ1 cells

Search for litech... They are retailers for bestech bms's. Thryhave hundreds of bms's to chose from, you can select a bms from whatever parameters you want.... Dimensions, amperage, voltage, switch, etc.
by kdog
Nov 28 2018 4:05am
Forum: Motor Technology
Topic: Problem with hub motor / hall / controller
Replies: 15
Views: 875

Re: Problem with hub motor / hall / controller

Loose magnet ring? I know it's unlikely, but it fits the noise and apparent increase in speed.
by kdog
Nov 27 2018 3:41am
Forum: E-Bike Technical
Topic: shimano steps e6000 battery wont take charge
Replies: 3
Views: 313

Re: shimano steps e6000 battery wont take charge

Two things.. First @18v for a year that pack is toast. Average V of 1.8v per cell is below safe, and a year is hell long at that voltage. If and it's a big 'if' you wanted to resurrect it I would have recommended charging very slowly til above 30v then normal charge, monitoring for heat. I would als...
by kdog
Nov 26 2018 11:44pm
Forum: Battery Technology
Topic: choosing the right wire guage
Replies: 9
Views: 488

Re: choosing the right wire guage

What controller are you using? You need to work on the controller parameters when designing your battery. 12kw motor? That's huge, going to need lots of amps. Range, terrain, type of vehicle, req speeds... All important factors to know to when designing a power system. Its a big project to be cuttin...
by kdog
Nov 26 2018 6:05am
Forum: Battery Technology
Topic: Solar panel direct charging
Replies: 3
Views: 375

Re: Solar panel direct charging

Lots of issues here 8) Firstly if your 48 v pack is so low that 18-22v can charge it.. You need to bin it now! I'm assuming it isn't so next point... To charge a 48v (assuming 13s) li-ion battery you need absolutely no more than 54.6v output and current regulated to Max recommended amps for that pac...
by kdog
Nov 26 2018 5:19am
Forum: Battery Technology
Topic: Ready to spot weld. Please check my work!
Replies: 19
Views: 933

Re: Ready to spot weld. Please check my work!

Careful of that near short on the positive end. Might just be the angle of the photo but it looks very close. If I feel uncertain about the way wiring sits, i imagine how its going to be/look after being ridden down dirt roads and bashed around for 10000+ cycles. I'd change that before you go any fu...
by kdog
Nov 26 2018 5:09am
Forum: Battery Technology
Topic: Seeing more 20700s in power tool batteries
Replies: 8
Views: 733

Re: Seeing more 20700s in power tool batteries

That's pretty crappy welding coming from Bosch. Not much point have nice chunky busses when the contact is so poor. Can you replace cells without the bms/hardware/ bricking?
by kdog
Nov 26 2018 4:59am
Forum: Battery Technology
Topic: choosing the right wire guage
Replies: 9
Views: 488

Re: choosing the right wire guage

You can't get away from having the correct amount of copper to carry the current that the controller is demanding no matter whether you series first or parallel first. What changes is only how many wires are involved at any point. Say you parallel first: then each cell can have a smaller wire ( appr...
by kdog
Nov 21 2018 10:20pm
Forum: Battery Technology
Topic: Ready to spot weld. Please check my work!
Replies: 19
Views: 933

Re: Ready to spot weld. Please check my work!

Ha! My kids love them... My 18mth old sticks them all over the shed.. I'm running around trying to find them all...
by kdog
Nov 21 2018 10:15pm
Forum: Battery Technology
Topic: What Are The Pros & Cons Of These 2 Battery Systems?
Replies: 7
Views: 437

Re: What Are The Pros & Cons Of These 2 Battery Systems?

Can't really advise as there is no real detail, but generally speaking... You are generally better off with a (or2) larger battery than two smaller ones. For a given amp draw, you are stressing a smaller battery more, and if you have a deep discharge before you swap them this is also taxing on the s...
by kdog
Nov 21 2018 6:01pm
Forum: Battery Technology
Topic: Ready to spot weld. Please check my work!
Replies: 19
Views: 933

Re: Ready to spot weld. Please check my work!

You don't need insulators on the negative end. Other than that it looks good.