Search found 3435 matches

by jonescg
Apr 21, 2018 8:47 pm
Forum: Alternative Energy
Topic: Biomass to Fuel?
Replies: 3
Views: 46

Re: Biomass to Fuel?

I think liquid fuels will still be essential for farming and agriculture. There's no way a farm can produce a few thousand tons of wheat on solar+battery powered tractors. So biodiesel makes sense in this instance. Smaller farms growing high value produce (horticulture, flowers, medicinal plants etc...
by jonescg
Apr 20, 2018 8:13 pm
Forum: Battery Technology
Topic: Tesla Model 3 battery teardown!
Replies: 4
Views: 165

Re: Tesla Model 3 battery teardown!

Save yourself the pain and skip to 29 mins. Or just open the files I posted for stills.
by jonescg
Apr 20, 2018 7:47 am
Forum: Battery Technology
Topic: Tesla Model 3 battery teardown!
Replies: 4
Views: 165

Tesla Model 3 battery teardown!

CpCrkO1x-Qo The guys at Autoline Network have put a Tubecast together of the Model 3 teardown where they discuss the BMS, onboard controls, and of course, the battery :twisted: The cooling system was always going to be an engineering challenge, given their desire to pack as many cells into the spac...
by jonescg
Apr 18, 2018 6:58 am
Forum: Large EV General Discussion
Topic: XING Mobility Miss R - Electric Supercar Concept
Replies: 6
Views: 122

Re: XING Mobility Miss R - Electric Supercar Concept

liveforphysics wrote:
Apr 18, 2018 5:47 am
Novec is pretty phenomenal in all aspect$$$, including its ability to weep right through most common fluid sealing interfaces. Quite the fluid to contain long term in complex systems, but possible to do.
Tell me about it... we're playing with it at work at the moment. Not a fan...
by jonescg
Apr 18, 2018 3:39 am
Forum: Large EV General Discussion
Topic: XING Mobility Miss R - Electric Supercar Concept
Replies: 6
Views: 122

Re: XING Mobility Miss R - Electric Supercar Concept

LockH wrote:
Apr 16, 2018 3:52 pm
"an immersive-cooled battery pack"... 8)

See that enormous radiator at the front? If they are immersing the battery in Novec or equivalent fluid with a quarter of the heat capacity of water, they will need 4 times as much radiator :)

Very cool though.
by jonescg
Apr 18, 2018 1:13 am
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3196

Re: Supercapacitors vs batteries. Capacity.

Yeah nobody has doubted the energy storage figures, and even the cycle life is good (really, 15,000 cycles would be enough) but to call it a supercapacitor instead of a lithium titanate cell is simply marketing.
by jonescg
Apr 15, 2018 7:55 pm
Forum: Battery Technology
Topic: Cycle Life tests or experience with Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E
Replies: 26
Views: 531

Re: Cycle Life tests or experience with Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E

https://endless-sphere.com/forums/viewtopic.php?p=1197080#p1197080 I had the voltage divider in there as I was testing 2s2p batteries, however I have since started using it as a single cell tester by wiring the battery sense wires directly to the analog input. Don't change the mV limits though as it...
by jonescg
Apr 15, 2018 8:29 am
Forum: Battery Technology
Topic: How to measure -60V to 1000V
Replies: 15
Views: 669

Re: How to measure -60V to 1000V

Yes capacitance on these HV packs would get super hairy. Particularly those with aluminium enclosures so close to the full potential of the pack. Working on live stuff (if you must) at these voltages is serious stuff. As for measuring voltage on a 1000 V pack, I use a voltage divider on Voltron and ...
by jonescg
Apr 13, 2018 7:57 am
Forum: Resources & EV Related Parts and Services
Topic: Australia - resources for e-bikes, kits and parts
Replies: 47
Views: 16354

Re: Australia - resources for e-bikes, kits and parts

Sorry for the necropost, but thought it better than making a new thread. Does anyone know someone in Sydney who can put together a battery pack? I have batteries BMS etc coming, but need somebody with the equipment/expertise to assemble it. TIA I'd say Bruno might be able to help you. Not sure what...
by jonescg
Apr 11, 2018 9:06 pm
Forum: Battery Technology
Topic: Is is it possible to build a 48 or 52v battery pack using removable (non soldered) 18650 cells
Replies: 22
Views: 342

Re: Is is it possible to build a 48 or 52v battery pack using removable (non soldered) 18650 cells

The thing I find with batteries is that the best battery is one which is built fit-for-purpose. If an application calls for 30 kW continuous, and 30 kWh of stored energy, you will need a cell capable of 1C continuous. If you felt like you could get away with 15 kWh instead, but you still need 30 kW,...
by jonescg
Apr 11, 2018 9:05 am
Forum: Battery Technology
Topic: Cycle Life tests or experience with Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E
Replies: 26
Views: 531

Re: Cycle Life tests or experience with Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E

I plan on setting up a life cycle test on some cells shortly. But the list of cells to test is long and I need more power supplies and Arduino boards. Plus it can take a month to get good data...
by jonescg
Apr 08, 2018 8:18 pm
Forum: Battery Technology
Topic: Why not Panasonic 18650pf
Replies: 20
Views: 1780

Re: Why not Panasonic 18650pf

Do take into account the maximum continuous discharge rate, as the higher energy density cells have higher DC impedance. This means under sustained loads they will sag to a point where a less energy dense cell would have delivered the same number of Wh at a higher power rating. For example, high C-r...
by jonescg
Apr 07, 2018 5:16 am
Forum: Items for Sale - New
Topic: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout
Replies: 20
Views: 2032

Re: li-ion 18650 Adjustable size BATTERY HOLDER - Honeycomb Layout

Yep. I just received my order of 1000 triple hexagons. Pretty convenient way to put a pack together.
by jonescg
Apr 03, 2018 2:09 am
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3196

Re: Supercapacitors vs batteries. Capacity.

I'd never be happier to be wrong! The thing is, this is a promise of orders of magnitude more energy density than the most advanced capacitors on the market. Someone deserves a frigging Nobel Prize if they have actually done it. It sounds like an electrochemical storage device being described as a s...
by jonescg
Apr 01, 2018 12:23 am
Forum: Vendor Relations Corner
Topic: Ovartech
Replies: 2
Views: 166

Re: Ovartech

Hi Ian, Rod Dilkes had exactly the same experience. Plus after I wrote to them asking for a price they said they generally won't sell one-offs, and if they do, it would be for twice the price I was quoted 6 months earlier. I daresay TC might be a better place to go shopping. Hope you get your money ...
by jonescg
Mar 28, 2018 10:09 pm
Forum: Technical Reference Area
Topic: Connectors ! Andersons, Deans, etc..
Replies: 22
Views: 23629

Re: Connectors ! Andersons, Deans, etc..

spinningmagnets wrote:
Jan 09, 2018 10:52 pm
From jonescg, Amphenol water-resistant connectors. They come in a variety of pin-counts and housing shapes.

http://www.amphenolpcd.com.cn/products. ... CateId=178
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Arrived today :)
by jonescg
Mar 28, 2018 3:24 am
Forum: Battery Technology
Topic: Capacity loss in LiCoO2 (LiPo) cells
Replies: 1
Views: 175

Capacity loss in LiCoO2 (LiPo) cells

Some researchers devised a predictive model which examined how cycling your battery at lower states of charge extends its life: 151 Capacity loss in LiCoO2.pdf Basically, these things shorten the useful life of a battery: Spending lots of time at high states of charge Being discharged from high SOC ...
by jonescg
Mar 27, 2018 8:14 pm
Forum: Alternative Energy
Topic: An off-grid install in the city
Replies: 18
Views: 806

Re: An off-grid install in the city

...... All up he's going to have a 5.5 kW solar system with 12 kWh of lead AGM batteries for about $5000. He wouldn't have done it unless the batteries were free. ?? If the batteries were free, and the panels were cheap , used,...how come the $5k ? You can buy a new 5kW system fully installed and g...
by jonescg
Mar 27, 2018 1:04 am
Forum: Battery Technology
Topic: DIY Car-sized battery pack ?
Replies: 3
Views: 257

Re: DIY Car-sized battery pack ?

I'm doing a car conversion (1988 Honda Prelude) for a friend and it's going to be using 960 x 7000 mAh cells. Liquid cooled too.
I'll start a build thread soon.
by jonescg
Mar 27, 2018 1:00 am
Forum: Alternative Energy
Topic: An off-grid install in the city
Replies: 18
Views: 806

Re: An off-grid install in the city

Or just buy a 24 volt / 48 volt fridge. Only has to keep a carton of beer cold :) https://www.energymatters.com.au/westinghouse-330-litre-dc-fridgefreezer-white-lhand-p-362.html Yeah the LEDs are pretty basic - no ballasts or anything like that. So far so good. All up he's going to have a 5.5 kW sol...
by jonescg
Mar 26, 2018 9:15 pm
Forum: Battery Technology
Topic: Long term use of Anderson and xt60 connectors
Replies: 6
Views: 234

Re: Long term use of Anderson and xt60 connectors

There wouldn't be an issue with the disconnection and re connection, but a pre-charge circuit would definitely help extend the life of the mating surfaces.
by jonescg
Mar 26, 2018 8:34 pm
Forum: Alternative Energy
Topic: An off-grid install in the city
Replies: 18
Views: 806

Re: An off-grid install in the city

Perth never gets 100 mph (160 km/h) winds. I calculated the wind load on these arrays and it worked out to about 25 kg-force per screw for a 100 km/h wind. Plenty of strength in the fixings, but thanks for your concerns all the same. "Is there a reason you didn't go with a grid tied system?" Yes, we...
by jonescg
Mar 24, 2018 9:11 pm
Forum: Battery Technology
Topic: Battery connector 600amp
Replies: 5
Views: 254

Re: Battery connector 600amp

I use Andersons for big stuff, or Amphenol HVSL conenctors for high end applications. But with 50 mm2 cable that's not unreasonable.

And 600 amps calls for at least 95 mm2 cables. And even then, that's for a 5 second burst.
by jonescg
Mar 24, 2018 8:29 am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 508
Views: 77039

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

Finished a quick 14s3p battery for an ES member. I'll leave the balancing / monitoring up to them, but the 8mm2 cables will have XT90s put on them.
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by jonescg
Mar 24, 2018 8:25 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Magnax bvba Axial Flux Motors
Replies: 2
Views: 198

Re: Magnax bvba Axial Flux Motors

If diameter space isn't an issue, sure. Like say, drive wheels on a replica steam locomotive...