Search found 121 matches

by Upperfoot
Jan 08 2021 7:23pm
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 54
Views: 4111

Re: EKartGo Project

I would try out those cell holders you can put together like logo, I personally use the ones from https://e-bikestuff.com/en/11-cell-holders
by Upperfoot
Dec 03 2020 6:58pm
Forum: Motor Technology
Topic: ME1616 motor with sevcon gen4 size 6 80V low power??
Replies: 9
Views: 644

Re: ME1616 motor with sevcon gen4 size 6 80V low power??

To get around the field weakening issue you can remain within its optimum RPM (about 3800rpm) and gear it appropriately based on the RPM for the speeds you want to achieve.
by Upperfoot
Dec 02 2020 4:42pm
Forum: Items for Sale - New
Topic: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout
Replies: 69
Views: 20211

Re: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout

Frank wrote:
Dec 02 2020 8:27am
Did these guys ever get an online store set up?
They are easy enough to deal with over email and bank transfer, I've purchased from them in the past.
by Upperfoot
Dec 02 2020 4:19pm
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 54
Views: 4111

Re: EKartGo Project

Spot welding... been there, tried that. MAYBE that is possible with a high power spot welder, but defiantly not with a KWeld (it will just timeout at 200ms). The thick copper bus bar absorbs the heat energy too quickly. Also using a MOT solder station does not work well. For me that was because of ...
by Upperfoot
Dec 02 2020 12:54pm
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 54
Views: 4111

Re: EKartGo Project

I wonder if rather than using solder which can be time-consuming, opposed spot welding could be another choice? Copper sandwiched between nickel could potentially work, as I know that spot welding copper to nickel alone is difficult to get right even with specialist equipment. I'll do an experiment ...
by Upperfoot
Nov 23 2020 1:57pm
Forum: Items for Sale - New
Topic: UK - Battery/EV Surplus Stock
Replies: 3
Views: 463

Re: UK - Battery/EV Surplus Stock

Two items just sold;
  • 80 x Samsung 30Q - Unused
  • Elcon/TC 18-99v 3.3kW EV Charger - CAN 500kbps
by Upperfoot
Nov 18 2020 6:49am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Drive Sprockets
Replies: 1
Views: 151

Re: Drive Sprockets

Hello, We are currently building an electronic speedway bike but have hit a slight snag with the drive sprocket. Our rear sprockets can be 428 chain or 520 chain and we can't seem to find a sprocket in either 428 or 520 that will fit the motor. It is 19mm with a 6mm keyway. Does anyone know where w...
by Upperfoot
Nov 17 2020 11:30am
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 54
Views: 4111

Re: EKartGo Project

Brilliant work! I can see you've put a lot of time, effort and passion into this project, the spreadsheet is especially helpful. Loved your video content on youtube as well
by Upperfoot
Nov 16 2020 8:27am
Forum: Items for Sale - New
Topic: UK - Battery/EV Surplus Stock
Replies: 3
Views: 463

Re: UK - Battery/EV Surplus Stock

Added new item;

Eltek Flatpack 2 HE 3000W - I can program it to a particular voltage and current limit when you order;

Voltage: 43.5V - 57.6V
Current: 0 - 62.5A
by Upperfoot
Nov 10 2020 5:54pm
Forum: Items for Sale - New
Topic: UK - Battery/EV Surplus Stock
Replies: 3
Views: 463

UK - Battery/EV Surplus Stock

Hello everyone, Have some leftover stock here that I want to get rid of; 100% Nickel Foil Strip - 7mm X 0.15mm X 100m - £180 inc VAT Copper Foil C101 (99.98%) in Coil 305mm X 0.10mm X 10m - £130 inc VAT Xiaomi Essential Scooter x 1 - £270 inc VAT each Eltek Flatpack2 HE 3000W (Custom ordered voltage...
by Upperfoot
Nov 07 2020 4:45am
Forum: Items for Sale - Used
Topic: Selling 55-60kW Electric Go Kart - North West UK - £3,000
Replies: 3
Views: 554

Re: Selling 55-60kW Electric Go Kart - North West UK - £4,000

Wow...where were you a year ago when I started my ekart build?? I’m using a ME1507 for my build along with a Sevcon Gen4 size 4. I’m about to start the process of programming the Sevcon any tips?? Thanks! Nice one! Just a lot of persistence, and don't be afraid to reach out to people, I wouldn't ha...
by Upperfoot
Oct 25 2020 2:10pm
Forum: Items for Sale - Used
Topic: Selling 55-60kW Electric Go Kart - North West UK - £3,000
Replies: 3
Views: 554

Selling 55-60kW Electric Go Kart - North West UK - £3,000

Hello guys, focusing on another venture so I'm wanting to part ways with my Electric Kart, it's in full running condition but I haven't used it in quite a few months and is just gathering dust! https://i.imgur.com/AXpi6tJ.jpeg You can see a gallery around the Kart here - https://imgur.com/gallery/AG...
by Upperfoot
Oct 16 2020 7:27am
Forum: Large EV General Discussion
Topic: 3.8Mw Electric hypercar
Replies: 18
Views: 1114

Re: 3.8Mw Electric hypercar

Well a dragster was being worked on with those specs (exc range) https://insideevs.com/news/408448/ev-dr ... australia/
by Upperfoot
Oct 03 2020 7:12am
Forum: EBike Build Threads
Topic: Vector bike and frame owners.
Replies: 1082
Views: 171335

Re: Vector bike and frame owners.

Vector is a reseller for Eleek frames FYI, though they do interchange some of their components for higher quality variations (Brakes being an example)
by Upperfoot
Aug 11 2020 10:15am
Forum: Large EV General Discussion
Topic: Go Kart Update
Replies: 77
Views: 14287

Re: Go Kart Update

Hello Hallkbrdz,

The pack has been retired in favor of a custom 18650 pack which is being UN38.3 tested, I'll update you guys with an update as quite a few things have changed as it's now a commercial venture, still want to share the knowledge and experience I've gained over the last 12 months!
by Upperfoot
Jun 29 2020 1:38pm
Forum: Items for Sale - New
Topic: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout
Replies: 69
Views: 20211

Re: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout

Just purchased some to try out, they fit together brilliantly, come with little tools to help you assemble and disassemble the pack so you don't cut your fingers to shreds, will let you know how pack building goes.
by Upperfoot
Jun 26 2020 2:37am
Forum: Battery Technology
Topic: HobbyKing unable to provide UN38.3 and MSDS
Replies: 13
Views: 414

Re: HobbyKing unable to provide UN38.3 and MSDS

“Enlightening “..?? I think you are a bit late to the game here ? Did you really expect a chinese hobby battery supplier to comply with western regulations, standards, and documentation. ?? You should consider yourself fortunate that you got such an honest reply, and not just a bunch of forged “cut...
by Upperfoot
Jun 25 2020 11:35am
Forum: Battery Technology
Topic: HobbyKing unable to provide UN38.3 and MSDS
Replies: 13
Views: 414

Re: HobbyKing unable to provide UN38.3 and MSDS

Well, this has been an enlightening journey for me. I've passed the information onto the relevant regulatory agencies as it's a public safety risk, especially if those shipments are incorrectly put onto passenger flights. They'll most likely disappear and reappear as another name.
by Upperfoot
Jun 25 2020 11:13am
Forum: Battery Technology
Topic: HobbyKing unable to provide UN38.3 and MSDS
Replies: 13
Views: 414

Re: HobbyKing unable to provide UN38.3 and MSDS

So Lucky Stuff Limited is the distributor in the UK - https://support.hobbyking.com/hc/en-us/articles/360036342033-Do-you-have-a-warranty-return-address-in-Europe- Yuheng, Wu is the current owner - https://beta.companieshouse.gov.uk/company/07555774/officers Yuheng, Wu also works at Hextronik (tradi...
by Upperfoot
Jun 25 2020 10:42am
Forum: Battery Technology
Topic: HobbyKing unable to provide UN38.3 and MSDS
Replies: 13
Views: 414

Re: HobbyKing unable to provide UN38.3 and MSDS

Remember, there's a lot of these battery companies literally selling recycled garbage to their customers, so you can't really think they care about anything beyond money? If someone comes after them they probably just intend to disappear and crop up under some new name. (IIRC BMSBattery has already...
by Upperfoot
Jun 25 2020 9:43am
Forum: Battery Technology
Topic: HobbyKing unable to provide UN38.3 and MSDS
Replies: 13
Views: 414

HobbyKing unable to provide UN38.3 and MSDS

I wanted to send along some unused batteries under IATA PI965 Section IA and requested a UN38.3 certificate and MSDS for one of their LiPO products and I got the below response... how exactly are they shipping goods around without those two things?

Image
by Upperfoot
Jun 09 2020 8:32am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 471
Views: 63054

Re: BOSS LEVEL CUSTOM SPOT WELDER

rojitor wrote:
Jun 09 2020 3:50am
Sorry guys. I have just buried my mom.
I have no time for this.
Kind wishes to you and your family
by Upperfoot
May 25 2020 12:58pm
Forum: Battery Technology
Topic: 30Ah 28s LiPo from 7s bricks
Replies: 35
Views: 2954

Re: 30Ah 28s LiPo from 7s bricks

Very nice Nuxland! Looks like those LiPO's are doing the job nicely, 8kg lighter, 5AH more, while pushing out more amps.

Did you measure any temperatures?
by Upperfoot
May 22 2020 2:52am
Forum: Battery Technology
Topic: (semi)-solderless design: Attaching cells with solder tags using brass bolts
Replies: 16
Views: 578

Re: (semi)-solderless design: Attaching cells with solder tags using brass bolts

...the added risks of compression joint resistance I do get your point but is it not a bit overrated? I mean there are people (e.g. Shawn McCarty with batteryblocs) who have been using magnets and compression for years without issues apparently. Also we're all using XT90-like connectors to connect/...
by Upperfoot
Apr 28 2020 8:24am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 514
Views: 58212

Re: Li-ion cells cycle ageing

Thank you for performing this tests!! There are interesting statistics about these cells. The Sony VTC6 will have reached the 700 cycles soon. The other cells soon after. What cells are you going to test after? That is actually a very good question :) I've always been intrigued about RC LiPO cycle ...