Endless Sphere

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...

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).

Good to know. I picked up my batteries and will try it out tonight on some scrap copper.

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...

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...

Curious - what have people used to weatherproof the connectors into a Orion2 BMS? Post what you have if you don't mind.

BTW - Keith said the KWeld kits won't be back in stock until the end of September. No details as to why.

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...

Well, you never know who started a project buying the top model and then abandoned it due to whatever.

Thanks...

Showed up today - looks good so far!

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

Let me know what you have.

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

Let me know what you have.

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

Let me know what you have.

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.

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...

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...

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).

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...

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

Good to know.

Any updates for this year with runtimes? Just curious how your pack does with that load.

Never mind...

I received a reply from Voltaplex, apparently these are NLA. So nothing to start a project with...

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. ...

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?