Search found 132 matches

by hallkbrdz
Sep 04 2020 9:29am
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 56
Views: 4224

Re: EKartGo Project

I hate delays... but life happens... I should have some photos and possibly video up this weekend of the start to the battery build. It’s unfortunately going slower than planed because of various things that seem to come up that need more attention. In the mean time here is my electrical layout. Thi...
by hallkbrdz
Sep 03 2020 3:20pm
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 38
Views: 3194

Re: "Copper/nickel sandwich" buses for series connections

Copper to copper? Probably not, too conductive.

8mm x 0.2mm nickel strip (four wide) to 0.8128mm and 2mm plate copper is what I am doing. Then nickel to nickel (cell).
by hallkbrdz
Sep 02 2020 8:31am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77666

Re: Spot Welding Copper Strips to 18650 Battery Cells

Good to know. I picked up my batteries and will try it out tonight on some scrap copper.
by hallkbrdz
Aug 26 2020 10:25am
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 56
Views: 4224

Re: EKartGo Project

Battery construction... Cells are here Spacers are here Busbar copper and plastic is now here Nickel strips are here KWeld - here tomorrow! Plan diagrams below. Busbar construction will have the nickel strips first welded to the busbars and then the busbars will be welded to the cells. All busbars w...
by hallkbrdz
Aug 25 2020 10:31pm
Forum: Large EV General Discussion
Topic: EKartGo Project
Replies: 56
Views: 4224

EKartGo Project

It's finally time to start documenting my build on this forum, and eventually with videos on YouTube. The goal for this build is to create a kart that is competitive with both of the local tracks karts. B&S 206, and TAG 100cc. Obviously the B&S is easier (and will allow for much longer runti...
by hallkbrdz
Aug 24 2020 7:17pm
Forum: E-Vehicles General Discussion
Topic: Orion2 BMS weatherproofing
Replies: 1
Views: 555

Orion2 BMS weatherproofing

Curious - what have people used to weatherproof the connectors into a Orion2 BMS? Post what you have if you don't mind. :wink:
by hallkbrdz
Aug 24 2020 7:14pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77666

Re: Spot Welding Copper Strips to 18650 Battery Cells

BTW - Keith said the KWeld kits won't be back in stock until the end of September. No details as to why.
by hallkbrdz
Aug 21 2020 8:33am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77666

Re: Spot Welding Copper Strips to 18650 Battery Cells

I assume the KWeld people are on holiday? Figures, finally have all the battery parts and nothing to assemble them with. I'll be using 0.032 inch buss bars for the 4x5 groups with 0.08 inch bars for the 2x10 groups. That should prove adequate for my average current requirements along with 1/0 supply...
by hallkbrdz
Aug 17 2020 6:30pm
Forum: Items Wanted
Topic: Wanted: Pre-owned Kelly KLS14401-8080IPS - US
Replies: 2
Views: 157

Re: Wanted: Pre-owned Kelly KLS14401-8080IPS - US

Well, you never know who started a project buying the top model and then abandoned it due to whatever. :thumb:
by hallkbrdz
Aug 17 2020 5:21pm
Forum: EBike General Discussion
Topic: bulkbattery review question
Replies: 8
Views: 545

Re: bulkbattery review question

Showed up today - looks good so far!
by hallkbrdz
Aug 17 2020 12:42pm
Forum: Items Wanted
Topic: Wanted: Pre-owned DC/DC conv. 12v from 126v-175v
Replies: 2
Views: 134

Wanted: Pre-owned DC/DC conv. 12v from 126v-175v

Wanted: Pre-owned DC/DC converter 12v from 126v-175v

Let me know what you have.
by hallkbrdz
Aug 17 2020 12:39pm
Forum: Items Wanted
Topic: Wanted: Pre-owned Orion BMS2 48-cell
Replies: 0
Views: 128

Wanted: Pre-owned Orion BMS2 48-cell

Wanted: Pre-owned Orion BMS2 48-cell, US seller please.

Let me know what you have.
by hallkbrdz
Aug 17 2020 12:31pm
Forum: Items Wanted
Topic: Wanted: Pre-owned Kelly KLS14401-8080IPS - US
Replies: 2
Views: 157

Wanted: Pre-owned Kelly KLS14401-8080IPS - US

Wanted: Pre-owned Kelly KLS14401-8080IPS, US seller please.

Let me know what you have.
by hallkbrdz
Aug 13 2020 2:31pm
Forum: EBike General Discussion
Topic: bulkbattery review question
Replies: 8
Views: 545

Re: bulkbattery review question

Update (1 day)

The cells have shipped as two packages. Good email notifications of payment, shipping, etc. so far. Weight seems a little low however based purely on mfr cell weight * number. We'll see when they get here next week, hopefully they can count. :wink:
by hallkbrdz
Aug 13 2020 10:15am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77666

Re: Spot Welding Copper Strips to 18650 Battery Cells

Or... this approach looks very robust and easily made to carry the 350A surge current I'm designing for (borrowed from spiningmagnet's ebike site :D ) Spot weld the strips to the buss bar, then attach the strips to the cells. https://i0.wp.com/www.electricbike.com/wp-content/uploads/2019/03/BatteryB...
by hallkbrdz
Aug 13 2020 8:41am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77666

Re: Spot Welding Copper Strips to 18650 Battery Cells

Interested because I'm either going to use .3mm copper / nickel coated spot welded, or just use plain soft copper and physically compression sandwich it like Kohlme did for his 26650 LiFePO4 pack. I'd prefer welded. I think the positive terminals should be doable, but am concerned about the negative...
by hallkbrdz
Aug 12 2020 2:31pm
Forum: EBike General Discussion
Topic: bulkbattery review question
Replies: 8
Views: 545

Re: bulkbattery review question

Hopefully they are good... they are associated with 18650batterystore.com.

Just ordered 425 Molicel P26A cells for a great price of $1466.25 delivered.

I'll post an update once they arrive (or not).
by hallkbrdz
Aug 12 2020 12:50pm
Forum: Motor Technology
Topic: I'm looking for developers/engineers interested in high current (+1kA) controller development
Replies: 13
Views: 1148

Re: I'm looking for developers/engineers interested in high current (+1kA) controller development

Axiom is overkill for most applications and there is a sweet spot in between, that spot is currently occupied by Sevcon & curtis controllers. I fully agree with that statement. I really like the Axiom VESA-based design but I don't need to drive that large of a motor. A modified design that coul...
by hallkbrdz
Aug 12 2020 8:00am
Forum: Motor Technology
Topic: Yamaha in the motor business
Replies: 0
Views: 709

Yamaha in the motor business

A video about this popped up yesterday in my feed on YT. I'm looking forward to their smaller motors, the more suppliers the more to choose from! Warning: Lots of speculation in the video...

https://global.yamaha-motor.com/business/e-motor/

https://www.youtube.com/watch?v=gGv0sVChnjc
by hallkbrdz
Aug 11 2020 9:42am
Forum: Large EV General Discussion
Topic: Go Kart Update
Replies: 77
Views: 14320

Re: Go Kart Update

Any updates for this year with runtimes? Just curious how your pack does with that load.
by hallkbrdz
Aug 10 2020 10:04pm
Forum: Items Wanted
Topic: WTB Samsung 20R cells
Replies: 4
Views: 179

Re: WTB Samsung 20R cells

Never mind...

I received a reply from Voltaplex, apparently these are NLA. So nothing to start a project with...
by hallkbrdz
Aug 09 2020 10:23pm
Forum: Items Wanted
Topic: WTB Samsung 20R cells
Replies: 4
Views: 179

Re: WTB Samsung 20R cells

Fair question. These are for an electric racing kart so weight is a big consideration along with high kW burst output. I also want to keep the voltage high to avoid any diminished performance at the critical end (120v motor for now). These are in the sweet spot for that for non-RC commercial cells. ...
by hallkbrdz
Aug 09 2020 8:01pm
Forum: Items Wanted
Topic: WTB Samsung 20R cells
Replies: 4
Views: 179

WTB Samsung 20R cells

Looking for a source for 506 new cells to start with for the first battery pack. Anyone know of a good one that has these in stock for reasonable prices and shipping - or did all the ecig people buy them up? :wink: