Endless Sphere

see how we catch fish? One could quickly determine if Marcos is the real deal. I bet he is ... When you are looking for help it is near impossible to find. Poking around in a forum like this can often result in access to super specialized charters. ... So who is currently employing marcos, how much ...

Hello, Please use the search function. I assume this is a student project of some sort? What you are doing is asking to be (what we call) "spoon fed". What will get you some traction is to dig around, come up with a "rough cut" plan, then accept criticism on that plan (I.e. there is no shortage arou...

A rare word of caution from me... I am sure you are fine with a genset - but the other day I was jumping a 5.8L V8 with a pair of 4Ah 4S Lipo packs - and we managed to create a considerable fireball. Yea packs were out of balance Yea packs were low Yea its like a 500A draw Yea yea yea... But yea... ...

Awesome - have fun. If you are looking for aging profiles you can find them at social gatherings like "lunch" and the like. You just have to make enough rounds (picture bit swarming - there are only 100pcs to the puzzle) to get enough random pieces, to frame out the border (bounds) and internals, to...

Meh - over it Intent was to break down existing USB-C articles to just what is needed to leverage the charging. Its covered other places but in a more complicated way than nessesary https://hackaday.com/2016/04/22/hackaday-dictionary-usb-type-c/ https://www.scorpia.co.uk/2016/03/17/using-usb-type-c-...

Got half way thru a long post on hacks for DIY charging with USB-C links pics breakdowns Accidentally clicked one of my attachment hyperlinks Pic opened upon hitting "back" - submission lost :evil: The data has to be cached on either my machine or on the server Cant find it Ideas welcome -methods

"Junk Bikes" (aka Jump Bikes) are directly, in a meaningful way, changing the culture in Santa Cruz Now... instead of folks coming here on a Sunday and spending hours driving around in circles looking for parking (which will later result in parking tickets...) And being "stuck" in the tourist traps ...

sorry but no, physics dont work that way. (not exactly anyway) What physics does not work what way? You are sounding like Luke. Probably a miscommunication? I made no statement that accelerated aging was simple and directly related to C-Rate - I just posted margined estimates on how long I thought ...

OMG you are an animal...

Its like you are doing someones Phd research for them

(not myspace profiles, facebook profiles, or LinkedIn profiles... "Aging Profiles") Just for clarification :P -methods EDIT: The above is conservative and calculates in margin. Yes I get that a 3C discharge happens in 20 minutes and that it will probably return to nominal temp in 20 minutes - so sti...

Have at whatever you like. The principles of Accelerated Aging apply The second order principles apply too (like COOL DOWN TIME) so get back to us when you are done calculating how long it will take to life-cycle the cells. At higher discharge rates you will require more cool-down period If 0.2C tes...

For single cell charging I have tried many things... In the end If you want to succeed as a hobbyist in anything remotely related to Electrical - you will - require a variable power supply. AKA - Lab Supply At a minimum this device has a power switch and 2 dials One dial sets the max voltage limit O...

Thanks for the reminder Fechter My only intention in this thread is to make sure that Vendors have a vector to provide positive and proactive customer service. I have come to the conclusion (myself) that altho Eric may not be around, that an officer of Luna can be, so things should be good. I do ten...

Justin is a special and unique guy. Every time he comes around I am inspired to create the positive change that I want to see in the world. The CA is my favorite tool... and I have convinced our Accountant that we need THREE for our current builds :wink: (plus one for my test bench, and one for each...

Accelerated aging can be used to move this test along. Contact someone on LinkedIn and get a profile By running at 20C, 40C, 60C, 80C... By increasing the rate of thermal expansion/contraction By pushing this limit or that limit... You can get a reasonably accurate 10 year run into 10 weeks ... As f...

.... The whole house got evicted by new property owners. So not "my" basement door any more [sigh]. A year later and house STILL sitting empty. [Grumble Grumble] ACK! I understand that grumble - believe you me! Keep belting out the information. Even if all can not absorb it... our "bots" can... and...

jonescg wrote: ↑

Apr 29, 2018 6:41 am

+1 on temperature control - it's probably the number one factor in cycle life. If you can hold the cell temperature as close to 20'C it will live a long life. ....

jonescg has been after this for a long time.
I trust his judgement like I trust Steves.

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P.S. And yea... I have charged a lot of cells to 4.4V Best thing you can do for yourself... Is get a representative sample (10pcs of the same) Take it out to the middle of a parking lot Hook it up to a power supply Start trying to brake them See what happens :idea: There is Testing and D-Testing For...

I would junk the BMS I would hand-charge the remaining cells up to 4.2V I would discharge the entire pack at a low C rate such that the 4.4V cells dropped to 4.2 I would bump-charge the low riding cells up to 4.2 to bring them all up to balance I would then loosely attach the pack to the bike (such ...

If you are allowing the pack to get above 60C (Which is very hot... burn you quick hot...) there will be other things to worry about. so - * Regular Use * Failure mode ... Failure mode is ... eh... an ugly subject. We are all still learning what to do when things go sideways. Just make sure that the...

LockH -
Hammering out the intel - as usual

-methods

(p.s. how is that basement door doing???)

Thank you for your service teklektik!

-methods

... E bikes are available to rent here and now. ... We have 350 rental ebikes here in Santa Cruz On any given day I see 30-40 of them buzzing around Men, Women, kids, elderly - all pedal-assisting They work on a battery swap program - one guy as far as I can tell Bikes are made out of nearly all "u...

Close... but more like this: . . . IMG_0024.jpg source: EM . . . Thats not the "evil one". The Evil one was 4 hub motors on 10" custom machined omni-directional wheels running 60V autonomous/remote control We chased Astro Teller out of the lab with it- literally. The machine would move in the most c...

Final post on the subject: What appears to be a very unbiased (if not particularly flattering) review on "another forum" which is paid for by Luna: https://electricbike-blog.com/2017/12/12/welcome-to-the-new-age-of-affordable-electric-motorcross-testing-the-sur-ron-60v-32ah-dirt-bike/ So - My review...