Search found 3249 matches

by jonescg
Dec 10 2018 12:54am
Forum: Large EV General Discussion
Topic: jonescg's eCRX pre-build thread!
Replies: 81
Views: 14001

Re: jonescg's eCRX pre-build thread!

Kurt wrote:
Sep 17 2018 3:36am
Im missing my old hoist...shed. So know how you feel about not wanting to start new projects without the space and gear.

Kurt.
Hoist to go in.jpg
Hoist to go in.jpg (159.11 KiB) Viewed 23 times
It gets installed on Wednesday :D
by jonescg
Dec 09 2018 10:28pm
Forum: Items Wanted
Topic: Open source e-bike controller - 250-500 W wanted
Replies: 5
Views: 146

Re: Open source e-bike controller - 250-500 W wanted

Quick question about the CA and Grinfineon - can you set the bike up to work with the CA, and then disconnect the CA? Say for those who don't want another gizmo hanging off their handlebars?
by jonescg
Dec 09 2018 8:38am
Forum: Battery Technology
Topic: The "thermal management of LiPo" thread!
Replies: 80
Views: 6570

Re: The "thermal management of LiPo" thread!

One of my recently completed LiPo modules with the liquid cooling plate on the base. The thermal epoxy has a thermal conductivity of 1.2 W/m.K which is nothing flash, but it's only about 1-2 mm thick, and it's oozed up in between the cells. That bottom surface represents about 20% of the available s...
by jonescg
Dec 08 2018 7:11am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 533
Views: 88924

Re: Assembled Hi-Power LiPo battery packs - any interest?

Just some pictures of the Prelude battery coming together:
4 done and a spare.jpg
4 done and a spare.jpg (220.67 KiB) Viewed 23 times
by jonescg
Dec 03 2018 10:47pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 2929
Views: 99443

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Has it been calculated how many square miles of unused roof space there is in US ? The USA is consuming 27,000 TWh primary energy per year. The total estimated output of every viable residential roof top is 1,000 TWh. . https://www.forbes.com/sites/rrapier/2018/04/29/the-solar-power-potential-of-ro...
by jonescg
Dec 02 2018 11:00pm
Forum: Battery Technology
Topic: VOC sensor for detecting electrolyte leakage... before it's too late!
Replies: 16
Views: 634

Re: VOC sensor for detecting electrolyte leakage... before it's too late!

And just to prove there's nothing new under the sun, these guys published the idea about 4 years ago:
Lorentz2014c_manuscript.pdf
(2.67 MiB) Downloaded 5 times
by jonescg
Nov 28 2018 10:18pm
Forum: Battery Technology
Topic: any experience with Outlast phase-change material?
Replies: 7
Views: 270

Re: any experience with Outlast phase-change material?

I have their brochure on my desk right now. As others have stated, it's great for absorbing heat but if it goes through a phase change, it's clearly not designed to be structural.
by jonescg
Nov 28 2018 10:10pm
Forum: Items Wanted
Topic: Open source e-bike controller - 250-500 W wanted
Replies: 5
Views: 146

Re: Open source e-bike controller - 250-500 W wanted

Thanks AW - from what I can tell they are looking to use both torque and cadence to determine how much assistance to add. They hope to use an AKM motor on the rear wheel. Not sure how much code they want to mess with. Will try and get some more information out of them. They are mechanical engineers ...
by jonescg
Nov 28 2018 7:30pm
Forum: Battery Technology
Topic: VOC sensor for detecting electrolyte leakage... before it's too late!
Replies: 16
Views: 634

Re: VOC sensor for detecting electrolyte leakage... before it's too late!

jonescg wrote:
Nov 28 2018 5:40pm
Yeah PTC was just shy of 100'C, VOC detected leaking electrolyte at 120'C.
Correction -
112 degrees C when the PTC popped.
129 degrees C when the cell leaked electrolyte.
160 degrees C at the surface when the cell went into thermal runaway.
by jonescg
Nov 28 2018 5:40pm
Forum: Battery Technology
Topic: VOC sensor for detecting electrolyte leakage... before it's too late!
Replies: 16
Views: 634

Re: VOC sensor for detecting electrolyte leakage... before it's too late!

Yeah PTC was just shy of 100'C, VOC detected leaking electrolyte at 120'C.
by jonescg
Nov 28 2018 6:39am
Forum: Items Wanted
Topic: Open source e-bike controller - 250-500 W wanted
Replies: 5
Views: 146

Open source e-bike controller - 250-500 W wanted

Can the brainstrust here make a recommendation on which e-bike controller to get? It's for a bike where a new kind of torque / effort sensor will tell the controller how much motor to deliver. It needs to be somewhat configurable / hackable so they can try a few things to optimise the feedback betwe...
by jonescg
Nov 28 2018 2:07am
Forum: Battery Technology
Topic: VOC sensor for detecting electrolyte leakage... before it's too late!
Replies: 16
Views: 634

Re: VOC sensor for detecting electrolyte leakage... before it's too late!

So the VOC sensor gives you 4.5 minutes advance warning of things about to go bad. Assuming the cell was heating due to some kind of internal failure - in this instance I was just heating it with Nichrome wire at 3 amps (about 10 W). The PTC miraculously worked in this instance, effectively disconne...
by jonescg
Nov 26 2018 2:59am
Forum: Forum Rules and Features
Topic: The future of our forum - facebook versus web forums
Replies: 37
Views: 1555

Re: The future of our forum - facebook versus web forums

I'm a big fan of forums. There's a reason they persist to this day - they do their job extremely well :es: Love this place, and all it stands for. Facebook is not the right tool for build logs and technical knowledge. If you want an argument about men's rights activism and cultural Marxism (whatever...
by jonescg
Nov 25 2018 7:57pm
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 533
Views: 88924

Re: Assembled Hi-Power LiPo battery packs - any interest?

Frank - hope to get that data this week. I've been busy with other stuff, but hope to get some numbers soon. I have a test rig where I measure inlet and outlet temperatures, as well as cell top temperatures. The thermal conductivity in that plane is very good (it's like 50% copper and aluminium thro...
by jonescg
Nov 23 2018 12:36am
Forum: Battery Technology
Topic: VOC sensor for detecting electrolyte leakage... before it's too late!
Replies: 16
Views: 634

Re: VOC sensor for detecting electrolyte leakage... before it's too late!

neptronix wrote:
Nov 23 2018 12:31am
That is awesome even if amateur code. So was the voc sensor just noisy?
I think its the ADC not being all that great. The average of 10 readings makes a huge difference.
by jonescg
Nov 23 2018 12:34am
Forum: Battery Technology
Topic: The "thermal management of LiPo" thread!
Replies: 80
Views: 6570

Re: The "thermal management of LiPo" thread!

i have 3 questions... 1. Why are you running your LIPO packs so hard that you need to think about cooling them? 2. Don't you know that running a LIPO pack hard shortens it's life significantly? 3. Ever hear of using larger LIPO packs so that over heating is never a problem? From the first page... I...
by jonescg
Nov 22 2018 10:52pm
Forum: Battery Technology
Topic: VOC sensor for detecting electrolyte leakage... before it's too late!
Replies: 16
Views: 634

Re: VOC sensor for detecting electrolyte leakage... before it's too late!

Just thought I would put some code up for anyone who is keen to try this. I set the Figaro VOC sensor up with an Arduino and logged the VOC output as a 0-1023 value It was awfully flakey so I found a bit of code to help with averaging sensor values (hey, it's a big deal for a noob like me!) int VOC1...
by jonescg
Nov 19 2018 10:45pm
Forum: Battery Technology
Topic: Do I need diodes with this layout?
Replies: 38
Views: 1224

Re: Do I need diodes with this layout?

I've never seen a contactor with a 100 volt rated coil...
by jonescg
Nov 16 2018 3:30am
Forum: Items for Sale - Used
Topic: Nissan Leaf Motor Adapter Plate Kit Solution - Most Manual Vehicles
Replies: 9
Views: 490

Re: Nissan Leaf Motor Adapter Plate Kit Solution - Most Manual Vehicles

I hope to use a Nissan Leaf in my CRX conversion, but the intention is to use the OEM final reduction and differential as well. Single speed FTW.

But any tips on motor mounts are appreciated.
by jonescg
Nov 14 2018 7:56pm
Forum: Battery Technology
Topic: Compression of Li-ion cells is good - but not too much
Replies: 6
Views: 415

Re: Compression of Li-ion cells is good - but not too much

We're all sort of wondering if that shouldn't be kilopascals - it equates to one ton of pressure on a 135 mm x 50 mm pouch cell!
by jonescg
Nov 14 2018 1:16am
Forum: Battery Technology
Topic: Compression of Li-ion cells is good - but not too much
Replies: 6
Views: 415

Compression of Li-ion cells is good - but not too much

226 Effect of compression on Li Ion cells.pdf
(1.24 MiB) Downloaded 40 times
Compression of a stack of electrodes in a Li-ion cell results in improved capacity retention, but at some point, it's not as helpful since it retards ion movement within the electrolyte. About 1.3 MPa looks to be ideal.
by jonescg
Nov 07 2018 7:33am
Forum: E-vents
Topic: AEVA National Conference, EV Expo and AGM!
Replies: 0
Views: 444

AEVA National Conference, EV Expo and AGM!

Just a reminder for all Aussies who are likely to be headed to the Sunshine State - the Australian Electric Vehicle Association (AEVA) will be hosting our annual conference and EV expo this weekend (November 9th and 10th) at the Brisbane Exhibition and Conference Centre, Southbank. https://evfest.ae...
by jonescg
Nov 07 2018 6:17am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 533
Views: 88924

Re: Assembled Hi-Power LiPo battery packs - any interest?

Toby - we can compromise - come to Brisbane for the AEVA conference and Expo! Brisbane is just up the road (in West Australian terms) :mrgreen:
by jonescg
Nov 07 2018 1:20am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 533
Views: 88924

Re: Assembled Hi-Power LiPo battery packs - any interest?

Technically they are a 2C continuous, 5C peak, but I wouldn't push them that far (usual LiPo rules). At 2C they are more like 190 Wh/kg, which is still entirely useful. The manufacturer of the cells does any chemistry you like, so I might see if they can do NMC in the same size format. There will be...