Search found 618 matches

by kdog
May 30 2020 7:10am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 251
Views: 53984

Re: Spot Welding Copper Strips to 18650 Battery Cells

@badazzsteveo
I used a home built transformer based spot welder. Like a mot welder but 2-3x stronger.
by kdog
May 23 2020 12:35am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Motor noise assitance
Replies: 2
Views: 95

Re: Motor noise assitance

remember not to swap around the red and black hall sensor wires (+and-)- only the blue yellow and green. otherwise youll be replacing the halls in your motor. there is an algorithm here on ES somewhere to find the best combination in the least moves- easy to google as well.
by kdog
May 10 2020 6:14am
Forum: Battery Technology
Topic: 60V 100A BMS 65mm and Thinner Than 21mm?
Replies: 9
Views: 434

Re: 60V 100A BMS 65mm and Thinner Than 21mm?

I find that by the time I've welded, fitted balance wires, insulated and packaged my battery, it's usually wider than 70mm.
by kdog
May 10 2020 6:03am
Forum: Battery Technology
Topic: BMS modding for more current
Replies: 32
Views: 5399

Re: BMS modding for more current

I hope EG hasn't left the forum, I think some stuff went down late last year.
This was a great little how to thread for basic modding of bms's with some really good pics.
by kdog
Apr 27 2020 10:00pm
Forum: Motor Technology
Topic: Low Power, High Regen?
Replies: 20
Views: 501

Re: Low Power, High Regen?

Out of production now but the adaptto controllers had the ability you are after. You can set all the parameters for power, Regen, charge voltage termination (say 80%soc) and then Max allowable voltage (for Regen). Super helpful for me as I live on a hill and Regen after about 5mts of riding for a bo...
by kdog
Mar 16 2020 9:09pm
Forum: E-Bike Technical
Topic: Hall sensors not working after replacing wire
Replies: 4
Views: 371

Re: Hall sensors not working after replacing wire

Well hopefully I can be more helpful. I assume you are turning the wheel in your video, or is it powered and your using the throttle (best is slowly by hand). The idea is that each hall led will turn on as a magnet passes over the sensor indicating it is working. From the video it appears that green...
by kdog
Mar 03 2020 10:35pm
Forum: E-Bike General Discussion
Topic: A2B Octive/Metro purchase?
Replies: 52
Views: 2012

Re: A2B Octive/Metro purchase?

These are shit bikes in many ways including major flaws in the frame... Do yourself a favour and steer clear. Plus any a2b parts are pretty much non existent. They handle like crap at speed. lots of annoying intracies
by kdog
Feb 16 2020 3:46pm
Forum: E-Bike General Discussion
Topic: 40k flat commute @ 40k/hr, Direct Drive or Geared?
Replies: 5
Views: 566

Re: 40k flat commute @ 40k/hr, Direct Drive or Geared?

I'd definitely be thinking dd hubby for efficiency, quietness and extreme reliability. I've done <8k Kms on several of mine (9c, lellie )and never touched them once. I love regen (hills), but it might not be an issue for you. 9c is a great choice for a basic hub. 8turn in a 26" wheel will get you 40...
by kdog
Feb 13 2020 10:53pm
Forum: Motor Technology
Topic: Hall sensor for Mac repair
Replies: 6
Views: 524

Re: Hall sensor for Mac repair

Thanks AW for the extra info. The terminology gets confusing. The supply I used to test them was a single cell 18650, hence not the 5v.
I've ordered some ss41s now... Just have to wait for them to arrive.
by kdog
Feb 13 2020 2:28pm
Forum: Motor Technology
Topic: Hall sensor for Mac repair
Replies: 6
Views: 524

Re: Hall sensor for Mac repair

Damn! I missed that spec, thanks for picking that up e-beach. I haven't measured the controller voltage but I assumed it was ~5v. I would be pretty confident that that is the issue....sigh, now to get that epoxy off :(
Cheers
by kdog
Feb 13 2020 7:26am
Forum: Motor Technology
Topic: Hall sensor for Mac repair
Replies: 6
Views: 524

Hall sensor for Mac repair

Hi all I'm having a little trouble with a repair on a friend's Mac motor. He crashed on the motor cable exit side, munched his cables and blew the halls. The controller is fine (tested on another motor). I've pulled new cable though (what a bitch!) and squared that all away no probs. To order halls ...
by kdog
Feb 03 2020 10:42pm
Forum: General Discussion
Topic: BMS 4s - 20P
Replies: 2
Views: 809

Re: BMS 4s - 20P

Bms's are rated by 3 factors
Chemistry
No. of series groups
Max and continuous amp limit
Chose one that suits your needs based on this.
Give yourself 50-100% headroom on amp limit as its usually overrated.
Without details on your specific needs this is all I can give you.
by kdog
Feb 03 2020 9:13pm
Forum: General Discussion
Topic: Welding failure
Replies: 14
Views: 1022

Re: Welding failure

Here a section of a weld I did on it a while ago. We (my son mostly :lol: ) smashed it up with a mallet, and had a look at its composition. In this section the weld is the lighter top most metal and a few mm below is the base metal. This one didn't fail like the one in question (well until the malle...
by kdog
Feb 03 2020 12:38am
Forum: General Discussion
Topic: Welding failure
Replies: 14
Views: 1022

Re: Welding failure

It hard to get a reasonable pic of it... Looks like rubbish on screen.
I guess it's probably as discussed, an unfixable failure. Good thing it's only a cheap vice but annoying that it's now useless. Mostly I fix stuff and use till its final death.
by kdog
Feb 02 2020 5:47am
Forum: General Discussion
Topic: Welding failure
Replies: 14
Views: 1022

Welding failure

Hi For the welders or metallurgists out there, can someone explain to me what process causes this. I welded up a repair in my sons cheap vice that looked like cast iron judging but the grainy structure of the metal. The section for the weld was about 5mm thick and was the extension arm near the head...
by kdog
Jan 12 2020 4:40pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Gazelle Cabby Electric Conversion
Replies: 5
Views: 2558

Re: Gazelle Cabby Electric Conversion

FYI they look like KT parts (not made by gazelle), if you need replacement electricals (controller, display etc) you will probably be able to get them cheap off aliexpress or ebay.
by kdog
Dec 28 2019 3:45pm
Forum: E-Vehicles General Discussion
Topic: Gear Reduction Motor Heating
Replies: 20
Views: 1709

Re: Gear Reduction Motor Heating

Ha I knew that was going to trip me up.... Haven't used the simulator for s while....but I have never noticed that option. Thanks for pointing it out. If I plugin enough reduction to keep speed down to 3kph on a small hub it never overheats even on 25deg with zero human power and 100kg. OP should be...
by kdog
Dec 27 2019 9:30pm
Forum: E-Vehicles General Discussion
Topic: Gear Reduction Motor Heating
Replies: 20
Views: 1709

Re: Gear Reduction Motor Heating

hey kale A friend of mine built an e-barrow. He used a 250w unite motor (one with a built in 9:1 reduction) then reduced it further 4:1 using chain and sprockets. it was just a brushed motor and he didn't bother even putting a controller on it- just a hefty on/off switch (actually I think it was two...
by kdog
Dec 14 2019 7:08am
Forum: E-Vehicles General Discussion
Topic: smoregrava's Torque Monster Electric Paxster Rebuilt
Replies: 2
Views: 806

Re: smoregrava's Torque Monster Electric Paxster Rebuilt

That's awesome! What are the specs on it? Great video too, loved the time-lapse.
by kdog
Dec 03 2019 8:35pm
Forum: Battery Technology
Topic: Need help constructing a pack
Replies: 6
Views: 582

Re: Need help constructing a pack

That's where the DIY bit comes in... I would build a battery housing to fit your frame first utilising highly sophisticated CAD (cardboard aided design) then fit your battery to the interior of the space you have left. Don't forget to include space for padding, insulation, wires and bms. Don't make ...
by kdog
Nov 12 2019 2:57pm
Forum: Battery Technology
Topic: Vax slimstick battery
Replies: 0
Views: 1462

Vax slimstick battery

Has anyone repacked a vax battery?i just picked up a vax slimstick cheap, I'm thinking of putting some 3.5ah cells in it, replacing the old 2ah ones it currently has. Hoping there are no nasty surprises like the bms locking out when I pull the cells.
by kdog
Nov 12 2019 5:01am
Forum: General Discussion
Topic: Other uses for a spoke
Replies: 5
Views: 1165

Re: Other uses for a spoke

Gross! But effective I imagine.
I bent a few around into a carabiner shape using the neck as the catch. Works quite well for light loads ~1-2 kg
Great thread!
by kdog
Nov 07 2019 4:54am
Forum: Battery Technology
Topic: Spot welder
Replies: 7
Views: 670

Re: Spot welder

Or look at the nickel over copper technique. 0.1 of both is easy as pie and gives you .5mm equivalent in nickel alone. I tthinkthe topic is covered in the spot welding copper thread.
by kdog
Nov 05 2019 3:36am
Forum: Alternative Energy
Topic: Stationary Charging a battery
Replies: 7
Views: 1580

Re: Stationary Charging a battery

Well to put some positvity into the thread.... I recently did a trip with 120w of (2x60w) panels that you could have put on a bike trailer no problem at all. I was using a lifpo4 4s 30ah battery and charging via a sla solar regulator and with bms. I was able to charge at 5amps and so it was only 6hr...