Search found 688 matches

by kdog
Jul 30 2020 1:39am
Forum: Battery Technology
Topic: Oset 24 r battery upgrade - Help!
Replies: 3
Views: 518

Re: Oset 24 r battery upgrade - Help!

Hey I looked into making up a battery for a friends osset about a year ago but it never eventuated. The motor won't really care what voltage your battery is, it's the controller you need to worry about. I don't know what max voltage it can handle, but it shouldn't be too hard to find out, if in doub...
by kdog
Jul 29 2020 8:43am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1668
Views: 260642

Re: Thread for new battery breakthrough PR releases

I think they're aiming at the ev market...
by kdog
Jul 28 2020 7:07am
Forum: Battery Technology
Topic: Need opinion : Designing a 7s14P in a small box 11*9
Replies: 11
Views: 753

Re: Need opinion : Designing a 7s14P in a small box 11*9

In this layout, you have only room for 3 connects ( with standard nickel build) where you have to join the next row. That's 6 amps per connection which is still OK with 0.2mmx7mm nickel. The first layout had room for 7 at the worst point. You could solder some copper strip or wire over the nickel to...
by kdog
Jul 27 2020 11:22pm
Forum: Battery Technology
Topic: Need opinion : Designing a 7s14P in a small box 11*9
Replies: 11
Views: 753

Re: Need opinion : Designing a 7s14P in a small box 11*9

Im assuming you've tried rotating 90deg and getting 14cells in one run... Whilst it's not the ideal layout for high amp draws, your ~0.4c draw should be fine. Just make sure you have as many series connects as possible and that you pull the power out evenly at the pos and neg end ie. run a fat coppe...
by kdog
Jul 27 2020 10:55pm
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1668
Views: 260642

Re: Thread for new battery breakthrough PR releases

Aus/us co-lab is trying to get a new battery off the ground. Source: the driven.nz "Magnis Energy Technologies and its US partner Charge CCCV (C4V) announced to the ASX on Friday morning its Extra Fast Charge technology managed to get a battery up to 85 per cent in just six minutes" Normal...
by kdog
Jul 27 2020 10:47pm
Forum: Battery Technology
Topic: Something I Don't Get With How a Pulse Welder Works...
Replies: 11
Views: 509

Re: Something I Don't Get With How a Pulse Welder Works...

Also it's only operating for milliseconds per few seconds. If the primary needed 5amps, even very thin wire could sustain that at 1-2%duty cycle.
by kdog
Jul 25 2020 5:15am
Forum: Battery Technology
Topic: BMS wrong voltage end no output with load
Replies: 12
Views: 339

Re: BMS wrong voltage end no output with load

Some of these small bms's require a charge to turn on. You might have to discharge the cells a bit to get it to charge... to turn on.
by kdog
Jul 16 2020 3:44pm
Forum: Battery Technology
Topic: DIY spot-welder, transformers from microwave ovens?
Replies: 69
Views: 16213

Re: DIY spot-welder, transformers from microwave ovens?

Make sure you have removed the magnetic shunts from between the primary and secondary coils (a small stack of lams). Then make sure you have no high resistance points along the path to the electrodes which will need to be copper. At ~1v any resistance means rapid loss of current. Are you operating t...
by kdog
Jul 13 2020 7:53am
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 703

Re: Spot Welder Electrodes Stick Baaad

:( no good. I'm thinking maybe something has gone wrong with the switching circuitry, for sure nothing is going to go wrong with those two coils (unless there's s short somewhere) . Very mysterious specially since you changed the electrodes etc. Start from the plug and check over it again. I'm outta...
by kdog
Jul 12 2020 6:52am
Forum: Battery Technology
Topic: What kind of BMS can i use on a 52v 14s 8p battery?
Replies: 26
Views: 1126

Re: What kind of BMS can i use on a 52v 14s 8p battery?

Bms could be perfectly fine...just turned off. Have you tried a quick charge? Test it it's off by putting an appropriate load across the output. If it's off that 51v will drop to nothing. (I'm assuming it doesn't have an on/off switch/wires). On it should show full voltage on output. Since your usin...
by kdog
Jul 07 2020 7:19am
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 703

Re: Spot Welder Electrodes Stick Baaad

Obviously tungsten melts at way higher temp but whatever the process was, brazing most likely it stuck hard. Micro arcing could potentially melt the surface but I don't think so. I was so dissapointed cause I thought tungsten would be grand. If you haven't tried more power then try it. I'm not talki...
by kdog
Jul 06 2020 7:14am
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 703

Re: Spot Welder Electrodes Stick Baaad

Something weird that I noticed with the machine that probably isn't related is that on strong electrode pressure and also with the head pressing for longer before firing the welds come out super weak which makes no sense to me. What always worked for me was the head pressing the lightest the machin...
by kdog
Jul 06 2020 7:05am
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 703

Re: Spot Welder Electrodes Stick Baaad

Wrt loss of power: still enough to weld but not enough to free the electrode once the weld is made is my thought. With a good weld, i usually notice a tiny amount of copper on the nickel that has departed the electrode. This is only based on observation of my own set up and might not apply to others...
by kdog
Jul 06 2020 6:43am
Forum: EV Business World
Topic: Tesla warranty ??
Replies: 5
Views: 399

Re: Tesla warranty ??

Not sure why this is such an issue to need to post about it. Googled several headlight assemblies from Porsche Audi etc all roughly the same cost as the Tesla give or take a thousand (but at these prices what's a grand) . Some were more.... I highly doubt if I walked in the local Audi shop with my o...
by kdog
Jul 05 2020 6:22am
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 703

Re: Spot Welder Electrodes Stick Baaad

Oh and tungsten is by no means the hardest material on the planet! No where near it. An ordinary grinding wheel will make mince meat of it, so you'll have no issue shaping the end. It is the hardest pure metal, so you won't be able to use any metal based tools with it, files etc. Tungsten carbide on...
by kdog
Jul 05 2020 6:15am
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 703

Re: Spot Welder Electrodes Stick Baaad

I tried tungsten... It was unusable due to... Sticking :? But I know others have used it with good success. My thoughts would be(in no particular order) : Loss of power from machine Corroded connection Heat affected/contaminated electrodes Electrodes wider due to shortening I use solid copper wire f...
by kdog
Jul 04 2020 12:08am
Forum: EBike Technical
Topic: Hub Motor Upgrade 500W to 750W
Replies: 82
Views: 2427

Re: Hub Motor Upgrade 500W to 750W

If a 500w motor is 'wicked hot' to touch then 750 isn't going to be much better as some one already said. Step up to the biggest geared hub you can find which ottomh is something like the mac. ~1000w cont. Probly. Others on the market. If your hubby is so hot that it is burning you it is already toa...
by kdog
Jun 21 2020 3:51pm
Forum: Battery Technology
Topic: 36v charger TEMPORARY on 48v system
Replies: 10
Views: 336

Re: 36v charger TEMPORARY on 48v system

In my experience the trimpots are for fine tuning and won't give you more than a few volts either wsy. You won't get more than about 45volts out of it before you're outta turns. But if youre lucky, absolutely turn down current output to maintain same output wattage, otherwise she blow quick (just a ...
by kdog
Jun 17 2020 6:36am
Forum: EBike Technical
Topic: Adaptto Mini-E/Max-E Owner's Thread
Replies: 5176
Views: 635599

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

Had a scary moment a few days ago. On my 3kw hub driven by a midi e, I was cruising along a gravel bike track at about 5km/h with my 3yo on the back in the kids seat, two old ladies in front of me and my boys on bikes on their way to school. The throttle stopped working, then about 2secs later the b...
by kdog
Jun 14 2020 3:52pm
Forum: EBike General Discussion
Topic: Cheap 3 kw hub motors?
Replies: 29
Views: 1147

Re: Cheap 3 kw hub motors?

$250 (I'm assuming USD) 2nd hand is probly the only way you'll find some thing for that price in 3kw motors shipped . But if you want a new one, have a look on aliexpress at the plethora of generic 3kw motors there.
by kdog
Jun 08 2020 4:40am
Forum: Motor Technology
Topic: 9 pin motor cable connector
Replies: 2
Views: 217

Re: 9 pin motor cable connector

20mm Max Diam for 9 pins. 3 of which need to carry 20amps...thats fairly tight. You would have more commercial options if you split it into two plugs (halls /phases) or gave yourself more room. I haven't google images (you can do that), but something like the bafang motor cable (also used by others)...
by kdog
Jun 04 2020 8:21am
Forum: Battery Technology
Topic: Which BMS is better: ANT or JBD?
Replies: 16
Views: 1107

Re: Which BMS is better?

Weird advert for that first one :shock:
I know nothing about either of them, but one is $13 and the other is ~$75 so that probably tells you the answer. I like the LCD display with the second one... Go with that one...but as I said I know nothing of their specs.
by kdog
Jun 03 2020 4:10am
Forum: Battery Technology
Topic: Simple regen design
Replies: 2
Views: 150

Re: Simple regen design

I had a mtn board with controllers that didn't have regen. I installed some 50amp auto relays to switch between power mode (motor) and a regen circuit I made. It was a learning experience, as in I learnt that switching high current DC is a pita. The relays fused shut (no brakes) or failed open (no p...
by kdog
Jun 01 2020 5:37pm
Forum: Battery Technology
Topic: Need a video of a lipo fire
Replies: 7
Views: 404

Re: Need a video of a lipo fire

I've got one, intentional short of an old pack. In a fireplace... Interested?
by kdog
May 30 2020 7:10am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77511

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.