Search found 3363 matches

by jonescg
Feb 18, 2018 12:06 am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 487
Views: 72692

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

I think the Kapton and potting compounds are probably the best way to go about it for now. And perhaps a 100 ohm resistor between the negative terminal and the chassis to ground any build up. This enclosure was also a very tight fit. If I'd made it a little bigger and used more potting compound to f...
by jonescg
Feb 17, 2018 11:12 pm
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 487
Views: 72692

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

Zero packs are potted inside aluminium cases too aren't they? My first bike has this problem - I'd get shocks off it all the time. That's why I went to polycarb enclosures...
by jonescg
Feb 17, 2018 10:31 pm
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 487
Views: 72692

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

Battery potted.jpg Well that was stressful. Thermal epoxy ensures its permanent; no going back. Despite all the efforts to keep it isolated, I'm still measuring a few volts between the terminals and the case. It rapidly diminishes so it could be a capacitive thing. That's why I like polycarbonate I...
by jonescg
Feb 17, 2018 9:04 pm
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 487
Views: 72692

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

Arlo1 wrote:
Feb 17, 2018 11:04 am
What BMSs are those?
ZEVA. Ian Hooper also lives in Perth - good bit of kit but the quiescent current is higher than I'd like for small capacity packs.
by jonescg
Feb 17, 2018 8:17 am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 487
Views: 72692

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

This pack is finally going together. Kapton in.jpg I was sent a sample of some of DuPont's latest Kapton - it has a thermal conductivity of 0.8 W/m.K which is about 7 times better than the regular stuff. It's also very thin. I just used contact adhesive spray to put it in place. I also have some the...
by jonescg
Feb 16, 2018 11:10 pm
Forum: Battery Technology
Topic: Tesla 18650 question
Replies: 12
Views: 207

Re: Tesla 18650 question

If you can cool the cells in any way, they will last longer. You won't get any more energy out of them, nor will their efficiency change, but they will last longer. The only cells which don't get as hot under discharge are things like the VTC6 and LG HG2 cells, which are rated for 30 amps per cell o...
by jonescg
Feb 16, 2018 8:22 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1599
Views: 34104

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Most Australians heat their homes with electricity? Here it's propane or natural gas. Natural gas is super cheap nowadays.[url][https://www.nmgco.com/Current_Natural_Gas_Rates.aspx/url] Gas was cheap here until the export marked exploded - now it's getting rather pricey. Natural gas producers would...
by jonescg
Feb 15, 2018 10:53 pm
Forum: Battery Technology
Topic: Tesla 18650 question
Replies: 12
Views: 207

Re: Tesla 18650 question

I've discharged Sanyo NCR18650GA cells at 1.5 C and they got to 80'C. I discharged a Tesla module at a little over 1 C with water coolant flowing through the pack, and the cells still got to about 46'C.

18650s just love getting hot...
by jonescg
Feb 14, 2018 3:29 am
Forum: E-Vehicles General Discussion
Topic: Lithium batteries for Submarines
Replies: 17
Views: 260

Re: Lithium batteries for Submarines

And I think that's the reason we'll never see civilian ships using nuclear reactors. There's about 52,000 merchant ships on the seas right now - if any number of them were fuelled by a <60 MW reactor, the anti-proliferation treaties might as well be ripped up. How hard would it be to keep an eye on ...
by jonescg
Feb 14, 2018 2:35 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1599
Views: 34104

Re: Wind and Solar vs Coal, Gasoline, Nuclear

If Jay Wetherall said one day, the SA government wanted to build a 2 GW thorium reactor in Port Pirie (and it would apparently have immediate support from the federal Libs, because they're keen on nuclear too) is there a reactor he could sign on the doted line for? Somehow I don't think it's mature ...
by jonescg
Feb 13, 2018 7:58 pm
Forum: E-Vehicles General Discussion
Topic: Lithium batteries for Submarines
Replies: 17
Views: 260

Re: Lithium batteries for Submarines

Spinningmags - I assume the reactor section of a nuclear sub is able to be opened to the sea should anything go runaway? Same thing could be done for lithium batteries going thermal too. Water, and lots of it.
by jonescg
Feb 12, 2018 11:33 pm
Forum: E-Vehicles General Discussion
Topic: Lithium batteries for Submarines
Replies: 17
Views: 260

Re: Lithium batteries for Submarines

I thought one of the bonuses of the lead batteries was ballast... Similar application to locomotives.

But the volumetric energy density would surely mean more time underwater.
by jonescg
Feb 12, 2018 6:22 pm
Forum: Battery Technology
Topic: Need help on 18650 battery series/parallel plan
Replies: 10
Views: 160

Re: Need help on 18650 battery series/parallel plan

Really? Option 1? Even option 2 seemed better. I thought you guys would say option 3 is best because there are so many connections. I like option 1 because it’s probably the easiest with the least connections. Well thats assuming I interpreted your drawing correctly. Is the solid line meant to be l...
by jonescg
Feb 12, 2018 6:57 am
Forum: Items for Sale - Used
Topic: 2x E-Max 110s 4Kw mopeds Silver and Black for sale on ebay
Replies: 5
Views: 381

Re: 2x E-Max 110s 4Kw mopeds Silver and Black for sale on ebay

That's a good price; I hope they sell. For anyone who is interested, take my word for it - once converted to lithium, even garden-variety LiFePO4, they are absolute troopers. I converted mine to lithium and have put 13,000 km on it in the 2.5 years since. If you can, drop a new controller in and the...
by jonescg
Feb 12, 2018 2:37 am
Forum: Battery Technology
Topic: Need help on 18650 battery series/parallel plan
Replies: 10
Views: 160

Re: Need help on 18650 battery series/parallel plan

My eyes are going blurry :D I think any approach where the series current path is not limited is the best. So probably your first drawing. If there are 31 cells in parallel, try to ensure all 31 cells have a series connection to the next 31 cells. Sometimes that's not practical, but aim to get most ...
by jonescg
Feb 11, 2018 7:44 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1599
Views: 34104

Re: Wind and Solar vs Coal, Gasoline, Nuclear

It's not there to power the state, it's there to cover brief shortfalls. Anything after that is a bonus.
by jonescg
Feb 11, 2018 6:41 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1599
Views: 34104

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Hillhater wrote:
Feb 11, 2018 5:46 am
And on the NEMwatch site, its also interesting to see what the battery contribution is to the power supply !!!! :roll:
Usually 30 MW under discharge, and when the wind is really blowing, up to 30 MW charge. The windows of high prices usually last about 2-3 hours.
by jonescg
Feb 11, 2018 4:56 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1599
Views: 34104

Re: Wind and Solar vs Coal, Gasoline, Nuclear

I think the NemWatch widget is pretty darn good with it's up-to-the-half-hour results and live demand data. http://reneweconomy.com.au/nem-watch/ If you look at it very early in the morning (like 3 am AEST) you can see Tumut 3 and Shoalhaven pumping water uphill. ..But it is hosted by RenewEconomy, ...
by jonescg
Feb 09, 2018 8:40 pm
Forum: Alternative Energy
Topic: My DIY battery storage system
Replies: 29
Views: 1887

Re: My DIY battery storage system

Sorry, by "at night" I meant, from 5 pm to 11 pm. It would mean being a total miser yourself, which most folks aren't going to do. Or live as a shift worker.... I plan on using this battery as a test-pack for when we own our own home and go full-legit with solar. Right now it makes no difference whe...
by jonescg
Feb 09, 2018 8:26 pm
Forum: Battery Technology
Topic: DIY battery pack cooling
Replies: 14
Views: 211

Re: DIY battery pack cooling

Some discussion here:
https://endless-sphere.com/forums/viewt ... 14&t=55074

Cooling is good if you can afford the space/weight/cost. Otherwise, build it to be big enough and of the right C-rating that it doesn't get too hot.
by jonescg
Feb 08, 2018 9:11 pm
Forum: Alternative Energy
Topic: My DIY battery storage system
Replies: 29
Views: 1887

Re: My DIY battery storage system

If you could charge a 280 volt DC battery by day, and connect it to a grid-tie inverter, it would theoretically current limit to the maximum power output of the inverter (2 or 4 kW) until the battery was flat. I suspect you would need to limit the battery side current to 20 A or whatever the input c...
by jonescg
Feb 08, 2018 3:02 am
Forum: Battery Technology
Topic: E-moto battery fire
Replies: 1
Views: 154

Re: E-moto battery fire

By the way - this is an old fire - happened over a year ago. Looks like a home-build

Czech translation:

"What make?"
"German prototype. It was a too big boiler. The world champion is the world champion, no. :-)"
by jonescg
Feb 08, 2018 2:57 am
Forum: Battery Technology
Topic: E-moto battery fire
Replies: 1
Views: 154

E-moto battery fire

n0NcLFsEkuw I can't tell whether or not it's a commercial product or a home-build, but the fire was fairly typical of a LiPo fire. They pull the battery pack out at the end and it looks like a big rectangular LiPo pack. I realise they were trying everything they could, but with Li-ion fired, there'...
by jonescg
Feb 07, 2018 8:24 am
Forum: Battery Technology
Topic: Sion Power Licerion Li-metal anode batteries
Replies: 1
Views: 97

Re: Sion Power Licerion Li-metal anode batteries

Yeah it seems using copper and graphite for the anode is more stable, but less energy dense. Using lithium metal as the current collector seems to improve things, but the electrolyte is critical.
by jonescg
Feb 07, 2018 8:10 am
Forum: Alternative Energy
Topic: My DIY battery storage system
Replies: 29
Views: 1887

Re: My DIY battery storage system

Rube wrote:
Feb 07, 2018 4:47 am
jonescg wrote:
Feb 06, 2018 8:18 pm
Fame! :lol:
Not as good as your sultury radio voice :D
Just for you mate :)

http://iview.abc.net.au/programs/abc-ne ... 808W033S00

Starts at 12:27