Search found 3371 matches

by jonescg
Feb 20, 2018 11:32 pm
Forum: Battery Technology
Topic: Inside an LEV50 prismatic cell
Replies: 5
Views: 172

Re: Inside an LEV50 prismatic cell

20180221_120837.jpg
20180221_120837.jpg (152.4 KiB) Viewed 163 times
170 mm wide, 110 mm tall, 40 mm thick
by jonescg
Feb 20, 2018 10:41 pm
Forum: Battery Technology
Topic: Inside an LEV50 prismatic cell
Replies: 5
Views: 172

Inside an LEV50 prismatic cell

I'm sure you can google this stuff, but here it is for the curious. 20180221_100753.jpg 20180221_100721.jpg 20180221_100643.jpg This cell was a failed cell from a Mitsubishi iMiEV battery. They are nominally 3.7 volts and 50 Ah. Interesting that they wound up two separate accumulator piles and fused...
by jonescg
Feb 20, 2018 8:33 pm
Forum: Battery Technology
Topic: Altairnano LTO module autopsy
Replies: 6
Views: 144

Re: Altairnano LTO module autopsy

XT90000 :lol:
by jonescg
Feb 20, 2018 1:26 am
Forum: Battery Technology
Topic: Altairnano LTO module autopsy
Replies: 6
Views: 144

Re: Altairnano LTO module autopsy

Interesting. What is the enclosure made out of?
by jonescg
Feb 19, 2018 8:24 am
Forum: General Discussion
Topic: Perth bike path speed bump trial set to force speeding cyclists to slow down
Replies: 9
Views: 143

Re: Perth bike path speed bump trial set to force speeding cyclists to slow down

We recently had 1 metre passing legislation enacted. It was like declaration of world war 9... Everyone in a cage wants cyclists off the road and on the bike paths. Then the pedestrians get upset because the cyclists are too fast! So rather than ignore them, they installed jumps, sorry, speed humps....
by jonescg
Feb 19, 2018 7:06 am
Forum: Alternative Energy
Topic: My DIY battery storage system
Replies: 30
Views: 2038

Re: My DIY battery storage system

On Sunday a good friend came around with an old PIP4048 inverter/charger. Finally I can put my battery to use! This inverter/charger is designed to take DC from solar panels (no more than 120 VDC) and charge a 48 volt battery. It also has an inverter which allows it to provide up to 4 kVA of power A...
by jonescg
Feb 18, 2018 9:33 pm
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 489
Views: 73116

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

Couple of shots of the battery potted inside the enclosure:
Potted2.jpg
Potted2.jpg (192.92 KiB) Viewed 86 times
Potted1.jpg
Potted1.jpg (192.09 KiB) Viewed 86 times
Just got to get the final terminations made through the Delrin and we're gold.
by jonescg
Feb 18, 2018 8:02 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1649
Views: 35609

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Beastie, for a guy who believes global warming is crap, you seem to be genuinely concerned with it with regards to sulphur hexafluoride - ...but only because it's used in the manufacture of solar panels. You know full well the majority of SF6 is used in all manner of industrial processes, of which s...
by jonescg
Feb 18, 2018 12:06 am
Forum: Items for Sale - New
Topic: Assembled Hi-Power LiPo battery packs - any interest?
Replies: 489
Views: 73116

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: 489
Views: 73116

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: 489
Views: 73116

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: 489
Views: 73116

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: 489
Views: 73116

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: 16
Views: 374

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: 1649
Views: 35609

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: 16
Views: 374

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: 329

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: 1649
Views: 35609

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: 329

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: 329

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: 191

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: 454

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: 191

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: 1649
Views: 35609

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: 1649
Views: 35609

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.