Endless Sphere

Now hopefully we have dispelled any myths. . . The type held and propagated by folks who have no practical sense of Power and Electricity. ... NO ... You can not practically "grab a charge" from a DC Fast Charge Station with a couple resistors and some jumper cables. :lol: ... What you can do tho. ....

I am actively recruiting right now. By actively... I mean right here, right now, get you an interview and an offer. ... If you are coming from someplace like Tesla... I can guarantee you an interview and priority. I value Tesla Engineers over Apple, Google, or anywhere else. Tesla has, over the last...

This will be slow to roll out... but I now am familiar with how to do this. From Easiest to Hardest: J1772: Basically you take any charger with a 240V input and zip-tie it to your bike. Add a diode and a couple relays and you are set. You will of course need the correct inlet connector. I can help y...

I have butted heads with the owner of Luna in the past. Credit where credit is due... In the business I did with him (Eric) he held up his end of the bargain and delivered what was requested in the condition described on time. Those rims look pretty munched... I would just use them myself EH... In t...

I did not read the thread, so probably should not post, but here is some factual data: * Utah, specifically Salt Lake City, is actually less than 50% Mormon. Compare that to some traditionally Christian cities. * Utah just passed the gnarliest DUI law in the country. .05 IIRC. * In the startup commu...

As for me? I have ex-wives and kids and Adult stuff to deal with. If you have ever had lawyers and kids and responsibility you will understand. ... I work 10hr days at an EV Startup 6 days a week. We are in the Bay Area and looking to hire... so if you want to "get some" and you have sKiLLz then con...

I have been participating, on and off, on forums similar to this since before we had digital cameras. Back then... the world was a different place. Search Engines effectively did not exist and ... the Internet as we know it... did not yet exist. This was not that long ago. Anyway... As things natura...

Semantics... But sure I agree.

I have been renting Jump Bikes... Even tho I have two perfectly good personal ebikes.

I like not worrying when I reach the end of the "last mile"... As opposed to the weight of protecting personal property.

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Step one is sparking interest in ebikes.
Charge station, swaps, pickup program... Matters not.

This early.. . they need to pick them up just to assess wear and service mechanical parts.

Santa Cruz now has a generation who think power assist rocks.

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20180929_080327_HDR-1328x747.jpg . From Android ... Pics? We rode last night. The program is a smashing success. The headlights must be upgraded The front brake needs more bias 20180929_080405-1328x747.jpg This is my sons sun flower. In the background is one of Santa Cruz's most valued Oak Trees. ....

WOOOHOOO Finally got the controllers re-flashed for pure current mode. .... And the best news of all, the bike runs straight and true .... Wow...I'm just elated. And a huge huge shoutout to Fany and Kelly Controllers. ... Kelly is a good company. They treated me well over the years. They make good ...

Soooo much information. Thanks for posting. Let me read through this and I may have some questions. In the mean time, thanks for sharing all this knowledge. Dont bother reading most of it - it is drivel I was high on coffee and cigarettes :lol: sigh... its all a man can do while he spools up for th...

Yes yes but I want a 80amp pack 120peak like a 20s8p of Samsung 25r. But what buss bar systen can supply that and fit on a bike. Keep your fuses. Hey Zip Its ok... I want a 100A/200A peak :P For my ebikes I still run pouch cells Their roots are in RC flight and that aligns perfectly with ebikes. I ...

To be clear If nit picking In this very particular case It is more reliable to run a coil that is of a voltage that is close to your pack This lowers the stress on the PWM fets (one top that stays on, but the bottom nchannel switches) They are small fets and ... if they fail... your system will fail...

That means over current on your contactor coil This is because the Sevcon is PWM'ing your pack voltage and sending that to your coil. If it is a raw coil... it works... as say your pack is 100V and the coil is 24V you send a 25% duty cycle... you get ok voltage Your contactor has built in supression...

I have seen them overseas but they are more a company that you spec and order batches from... So from the supplier I am sure you could get sample batches out of them - 5 could happen but 20 is where I usually start (Enough to convince them that you are doing an engineering evaluation) Zero specified...

I have on my KMX trike a rim I think it came from a 2008 Zero... so that would be a 17" motorcycle rim? I used to adapt (lace) all bike rims to the special KMX hub... which takes a funny shaft size... but that got old. I had an adapter machined with the ID of the KMX shaft and the OD to fit this par...

Kit for 30 cells = $1 a cell
So - 10*14 = $140

For that.... You could build a kit which is sound (in an engineering sense) and safe.

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Sorry - one last bit Where you may replace the pogo pins with standard nickle springs @ 1/10th cost or buy pogo pins in quantity 100,000 Where BMS ends up in pack for free* Where you supply LabView program to characterize pack in 3 steps to assess first bank to LVC and highest bank - Program tells y...

So back to the OP Back on topic Using the legos provided (I have mine) I wish to build a pack which can be serviced and rebuilt I believe the best method to do this is to spring-load We know from our proofs above that should a single spring fail it will not fail our pack (Proof, we build P then S, p...

So looking at these Lego cell combiners (thank you to OP... you are RAD for sharing this) Mine have channels built in for strips right out of the box My caliper says they are 0.300 inches across Obviously this was the original intent Run strips across the parallel tracks Go over the top of that (or ...

Example: Yea - I was bound by NDA, and before that bound by threat of death - (I took part in the original Validation while working with a clearance ... at a place so serious that we were not even allowed to LOOK at the internet without risking an infraction) - but the information is freely accessib...

A quick note: 1) My "lego cell holders" came in from Amazon... They are GREAT! My Accountant ordered them as a surprise for me They were DIRT CHEAP They hold together well They grasp the cells well They are the only way to go IMHO - as they keep an air gap between the cells (Please new folks - never...

P.S. Most people running dual controllers are doing so in a tandem configuration. Speed mode is a confusing mode for many people. It can be visualized in 2 ways 1) Big difference in current speed vs demanded speed This is like flipping an OpAmp into saturation - the current limit dominates 2) Tiny d...

Keeping away so as to bring the different perspective: Started reading a few pages back Skimmed the last page or two ... I saw a side by side freewheel test... I would expect those to come in line on line. 10% is a major difference in two motors that are supposed to be "the same". When I was importi...