Search found 778 matches

by zzoing
Jan 14 2022 9:06pm
Forum: EBike Technical
Topic: Reducing Rotor back-iron
Replies: 8
Views: 229

Re: Reducing Rotor back-iron

What do you mean? can you post a fast picture please?
by zzoing
Jan 14 2022 9:04pm
Forum: EBike Technical
Topic: Surron X DC-DC capacity?
Replies: 1
Views: 126

Re: Surron X DC-DC capacity?

Write to Bruno Poweeeer or his shop email, they specialize in Sur Rons, and tell us what they say!
by zzoing
Jan 14 2022 9:15am
Forum: EBike General Discussion
Topic: Exploding ebike tire?
Replies: 23
Views: 510

Re: Exploding ebike tire?

Good find MadRhino... Best work safety accident info since I read about bench grinding wheels being covered in metal which can cause them to explode into a worker at 5000rpm... They are one of the most fatal workshop equipments. If it exploded at rest, i'd say it's not possible: must have been a mou...
by zzoing
Jan 14 2022 6:47am
Forum: Battery Technology
Topic: Can someone please run a science test on 18650?
Replies: 4
Views: 232

Re: Can someone please run a science test on 18650?

Indeed it does. The ranges of the steel can are 170-250u. The max force / the resistance kN until the battery was compressed exactly by 1000u was 70-80kg for all the cells tested, and then the short circuit happens at 500-600kg. Even though there's lots compression contacts in the industry, There's ...
by zzoing
Jan 10 2022 11:09pm
Forum: Battery Technology
Topic: Can someone please run a science test on 18650?
Replies: 4
Views: 232

Re: Can someone please run a science test on 18650?

Because nobody knew, even vaguely, if it's 20 pounds/ 120 pounds, the previous time Wrecker Magoo asked this question in 2014!!! Sorry I just found a science document: :) https://www.researchgate.net/publication/309562726_Deformation_and_failure_mechanisms_of_18650_battery_cells_under_axial_compress...
by zzoing
Jan 10 2022 10:49pm
Forum: Battery Technology
Topic: Can someone please run a science test on 18650?
Replies: 4
Views: 232

Can someone please run a science test on 18650?

Hi, Please can you test compression limit that an 18650 can withstand... Is it 20 pounds? 90 pounds? Please can you compress some 18650's on some bathroom scales and measure on a precise caliper how many KG can change the height of the 18650? Do you have high-precision calipers at 10 microns? I just...
by zzoing
Jan 07 2022 5:52am
Forum: Battery Technology
Topic: Can the PTC and CID in an 18650 have discontinuity from knocks?
Replies: 0
Views: 116

Can the PTC and CID in an 18650 have discontinuity from knocks?

I checked for discontinuities in a weldless 18650 box. There was a 0.041ms loss of signal when I dropped it from 35-40 cm straight onto the lid against wood... Do you think it could be the PTC / CID which could have vibrated and lost power? Because the CID contact area is quite small compared to the...
by zzoing
Jan 06 2022 8:17pm
Forum: Battery Technology
Topic: New Research on Reviving Lithium Batteries
Replies: 2
Views: 184

Re: New Research on Reviving Lithium Batteries

Can we test that voltage trick at home? Do we pulse wave it using a specific volts? I can't believe that some li-ion 18650 cells are achieving 1100 cycles these days. they've risen from 450 to 1100 since 2014, so perhaps we will be at 2300 recharges soon.
by zzoing
Jan 05 2022 12:34am
Forum: Alternative Energy
Topic: Fresh Air Engine
Replies: 12
Views: 462

Re: Fresh Air Engine

That's very good CAD work and good engineering. I'd suggest to channel your time and efforts into technologies which are fairly recent and currently changing and growing in user base, things that you spend a lot of time on and want a fix for, things that you find very inconvenient and you know other...
by zzoing
Jan 05 2022 12:07am
Forum: Battery Technology
Topic: Today work - Reparing citycoco trash transport..
Replies: 3
Views: 247

Re: Today work - Reparing citycoco trash transport..

Hahah that's very conscientious, i like that. I found a complete citycoco style scooter at the recycle center once, next to the metal scrap bin, with 3 lead acid batteries beside it. I lifted it and it was 40 kilos, i.e. twice as much as my ebike... I'm on the first floor of a building so i left it!...
by zzoing
Jan 04 2022 11:51pm
Forum: Battery Technology
Topic: DIY Spot welder power- limiting factor?
Replies: 9
Views: 1733

Re: DIY Spot welder power- limiting factor?

Your welding cables are crazy long, are they 2m? what AWG? if you upgrade 100A cables to 200A or use them for shorter lengths, it boosts the weld a lot.
by zzoing
Jan 04 2022 11:46pm
Forum: Battery Technology
Topic: Help with Motorcycle battery
Replies: 3
Views: 299

Re: Help with Motorcycle battery

Technically, you can measure every single line on the voltmeter, and there may be a hidden fuse someplace or a BMS wire that has come loose, I'd measure every wire from the BMS end twice using very precise multimeter tips if it's on the molex. If it's fine, and you have studied the BMS wiring diagra...
by zzoing
Jan 04 2022 11:37pm
Forum: Battery Technology
Topic: Cycle life tests of High Power density cylindrical cells
Replies: 7
Views: 618

Re: Cycle life tests of High Power density cylindrical cells

Awesome work!!! What an impressive battery of tests. That's one of the best technical research posts I've seen on ES and compared to other 18650 graphs available... I'd summarize the result as: The LG has quite a lot of resistance and high temperatures, but it's still safe after 1000 cycles, so it g...
by zzoing
Jan 04 2022 11:22pm
Forum: Bike Mechanical & Structural
Topic: Mechanical disc brake becomes weak after few stops
Replies: 5
Views: 155

Re: Mechanical disc brake becomes weak after few stops

I'd send it back to the shop, you can get lots of cable disk brakes used on YT for 10-20 from avid and generic ones. When the cable is tight it's tight. Brake lines are one of the most reliable elements of a bike, steel on steel, they are 1mm accurate once tensioned. I'd search google for similar is...
by zzoing
Jan 04 2022 11:15pm
Forum: EBike Build Threads
Topic: Stealth FUTR owners builds and pics
Replies: 2447
Views: 254304

Re: Stealth FUTR owners builds and pics

That's a total huge BEAST BIKE!!! That's not under the radar! If you change the color scheme to zebra, using make-up to disguise it as a Bosch type ebike, and change the hub aluminium grey, and use forks that are less designed for 12ft drops, Then it will be a stealth ebike... it looks like a trail ...
by zzoing
Jan 04 2022 10:48pm
Forum: EBike Technical
Topic: Crystalite controller info?
Replies: 14
Views: 304

Re: Crystalite controller info?

That was ages ago that I switched away from Xlyte!!! as soon as something as good was available. Perhaps they use high quality caps these days!?. I'd write to them, it's a nice company, I figure they are trying to put quality gear these days! Some folk on here will know what their reputation is, I'd...
by zzoing
Jan 04 2022 10:13pm
Forum: EBike Technical
Topic: Crystalite controller info?
Replies: 14
Views: 304

Re: Crystalite controller info?

I was always well within the voltage specification. The time the caps blew after 1-2 months was because of low quality caps, it was my 3rd/4th xlyte in about 2013. Their hubs used to have the reputation of being slightly out of alignment, and the hub would go up and down by 1mm as well as going roun...
by zzoing
Jan 04 2022 10:07pm
Forum: EBike Technical
Topic: building the BESC - 100V, 400A motor controller
Replies: 109
Views: 9231

Re: building the BESC - 100V, 400A motor controller

I love it! I'd stay under 72V because that's a lot for an ebike and it's the maximum safe voltage limit for human touch as recommended by the IEEE.
by zzoing
Jan 04 2022 10:04pm
Forum: EBike Technical
Topic: 72v Controller suggestion
Replies: 1
Views: 171

Re: 72v Controller suggestion

Anything infineon based will do!!! If it's a serious tool you use, I'd vouch for a grintech sinewave regen controller, then i'd add hot glue to the wires so they don't wiggle so the controller wires are firm and cosy, and then i'd expect 5 years of perfect performance from it because they are good.
by zzoing
Jan 04 2022 10:00pm
Forum: EBike Technical
Topic: Phaserunner Vs. 40A Grinfineon (10T Gmac)
Replies: 6
Views: 427

Re: Phaserunner Vs. 40A Grinfineon (10T Gmac)

Perhaps the Gmac will burn fast on a 40A Grinfineon because it's too overrated. A 1 kilowatt motor on a 1.5 kilowatt controller going uphill will get hot after 5 minutes of tarmac mountain climbing and 1 minute of rocky path climbing. The grinfineon's are very efficient and quality signals, and phas...
by zzoing
Jan 04 2022 9:52pm
Forum: EBike Technical
Topic: Crystalite controller info?
Replies: 14
Views: 304

Re: Crystalite controller info?

I went through a bunch of Xlyte controllers, I found them to be less reliable than grintech generally, sometimes the caps blew after a month of moderate use, all the Xlyte lasted a relatively short time. I'd stay within spec, the Xlyte company is very responsive AFAIK, you can write to them for spec...
by zzoing
Jan 04 2022 9:47pm
Forum: EBike Technical
Topic: 48v controller on 52v system ?
Replies: 17
Views: 407

Re: 48v controller on 52v system ?

Both your controller/system will have a maximum voltage... i.e. Grintech controllers used to be called 48V when they had a max rating of 62V. Generally, your heavy duty DC equipment will stay cooler and last longer at 50-70% of maximum watts rating. Higher volts cause less heat, just match the docum...
by zzoing
Nov 25 2021 12:23pm
Forum: E-Vehicles General Discussion
Topic: Looking for drive reduction suggestions
Replies: 5
Views: 473

Re: Looking for drive reduction suggestions

Hey, check this gear reduction system it uses a peak torque damping technology.

https://youtu.be/sNSKmLGvU_0?t=159
by zzoing
Nov 25 2021 12:01pm
Forum: Battery Technology
Topic: New Easy Lithium Weldless Box crowdfunding project
Replies: 18
Views: 798

Re: New Easy Lithium Weldless Box crowdfunding project

It's laser cut and polished 2mm pure nickel disks welded onto 1mm copper, which is welded using flux and solder, although it can be spot and ultrasound welded too. An advantage of using nickel contacts in high vibration settings is that the contacts become a mirror-flat shim, thereby increasing the ...
by zzoing
Nov 24 2021 6:41am
Forum: Battery Technology
Topic: Rebuilding a lion pack.,
Replies: 4
Views: 332

Re: Rebuilding a lion pack.,

What are your electrical DIY skills like? I'd recommend that you take some photos inside the battery and count the cell number like 10s series or put a multimeter DC on your charger to see if it's 42.0, which means it's 42v maximum charge and 32v minimum, 37v most of the time... What you'll find is ...