Endless Sphere

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...

I think they're aiming at the ev market...

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...

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...

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...

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.

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.

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...

:( 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...

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...

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...

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...

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...

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...

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...

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...

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...

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 ...

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...

$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.

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)...

Weird advert for that first one
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.

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...

I've got one, intentional short of an old pack. In a fireplace... Interested?

@badazzsteveo
I used a home built transformer based spot welder. Like a mot welder but 2-3x stronger.