Search found 492 matches

by bga
Sat, 22 Oct 2011, 17:18
Forum: EV Motoring
Topic: hydrogen re-filling station
Replies: 9
Views: 2602

hydrogen re-filling station

These companies are into creating an essential infrastructure with them at the core. True! For the highway, I'm sort-of looking for the idea of an updated Prius/Camry which can do, say , 60 km's on battery alone, but can use a frugal motor to power it to a max of 130-140 km/hr on the highway if nee...
by bga
Sat, 22 Oct 2011, 16:36
Forum: EV Motoring
Topic: hydrogen re-filling station
Replies: 9
Views: 2602

hydrogen re-filling station

Yes, I liked the '48 panel' and '0.5kg H2, enough for a daily commute'. All the stuff about off-peak electricity is because honda hates batteries http://forums.aeva.asn.au/smileys/smiley1.gif Ths provides a perfect case example of why Hydrogen is such a bone-headed idea. If we belive the figures in ...
by bga
Fri, 21 Oct 2011, 20:31
Forum: General EV Discussion
Topic: Zebra battery and U Caps
Replies: 14
Views: 3369

Zebra battery and U Caps

Preview

The big Zebra is a large rectangular box - hard to make fit in a car let alone a glider.

Why bother with capacitors, The object is to get off the ground, not fly straight up. A 10C battery would work and be a lot simpler.

edit: deleted irrlevant nonsense
by bga
Tue, 04 Oct 2011, 05:06
Forum: EV Motoring
Topic: Tesla Model S Shown Publicly
Replies: 10
Views: 2305

Tesla Model S Shown Publicly

From Reuters, today: climate spectator story FREMONT, California (Reuters) - Electric carmaker Tesla Motors threw open its factory doors to customers who have preordered its forthcoming Model S sedan on Saturday evening. Customers were given tours of the Fremont, California, factory, rides in a prot...
by bga
Sun, 02 Oct 2011, 18:14
Forum: Technical and conversion discussion
Topic: Gearbox to motor hub - USD40
Replies: 4
Views: 1290

Gearbox to motor hub - USD40

The last one I saw on a farmer's generator was making more noise than the diesel!

by bga
Mon, 12 Sep 2011, 06:28
Forum: Batteries, charging, management and monitoring
Topic: Lithium Sulfur Batteries
Replies: 57
Views: 13908

Lithium Sulfur Batteries

Re-built website and new data sheets on-line at Winston-Thundersky (see winston-battery.com) The newest data sheet for the WB-LSP600AHA cell has been changed significantly, as follows: Old data sheet Weight : 5.3kg Capacity : 600AH Voltage under discharge:     Vcell =~ 2.3 - 0.05C    (0.1C = 2.3V, 5...
by bga
Tue, 30 Aug 2011, 23:11
Forum: Batteries, charging, management and monitoring
Topic: Aluminium-Ion Battery Technology
Replies: 6
Views: 2432

Aluminium-Ion Battery Technology

They must have a pile of TS cells in their battery: the racingendurance website says: 550V @ 56kwh (I guess 170 x 100AH LiFePo) for the battery. (I found this by hovering over the battery on the car page) That makes the 400km range believable, but with 540kg of cells. Aluminium Ion does look to be c...
by bga
Sat, 20 Aug 2011, 07:07
Forum: General EV Discussion
Topic: PAPER Battery
Replies: 2
Views: 1066

PAPER Battery

All carbon -- definitely made of the right stuff. My reading on these devices indicates that it is possible store about as much energy as lithium Ion batteries do, but this may be some way in the future. Even if high energy density isn't realised, a carbon-based battery that can be charged and disch...
by bga
Mon, 15 Aug 2011, 03:20
Forum: Batteries, charging, management and monitoring
Topic: Lithium Sulfur Batteries
Replies: 57
Views: 13908

Lithium Sulfur Batteries

Whatever that b***y IE back page button is, I have got to disable it. Take 2. Hi Pink, I agree that 600 AH is way to big for car rproject - it would make a whopping 72V battery - how about a golf cart with a 300km range? It's not so silly in a bus, though : 500V x 600AH is about 300kwh, good for all...
by bga
Sun, 14 Aug 2011, 03:41
Forum: For Sale/Wanted
Topic: Wanted - 3-ph Motor (>60kW)
Replies: 11
Views: 1028

Wanted - 3-ph Motor (>60kW)

Hi Stiive, As you can guess by the resounding silence, there's a reason that many of us are using industrial IM. They're not too far off your target weight if they are suitably configured, run fast and hard. The IM I'm using (180 frame size) weighs about 115kg, but can peak at about 120Kw for 15 sec...
by bga
Sat, 13 Aug 2011, 01:16
Forum: The Lounge
Topic: Life without ropes
Replies: 3
Views: 1322

Life without ropes

I had to get my chalk out while watching that!


You know what they say:

There are Old climbers and there are Bold climbers, but there are no Old, Bold climbers!

Unusually, this biography isn't posthumous.


by bga
Sat, 13 Aug 2011, 00:49
Forum: EV Motoring
Topic: US to mandate minimum EV noise level
Replies: 9
Views: 2612

US to mandate minimum EV noise level

Oh, never mind... I didn't hear a thing. Subwoofers aren't they some navy mascot?? I think that it's more about delegating common sense and responsibility; and because there are plenty of cretins around legislature halls and car makers engineering labs. edit: It's all rather idiotic when you conside...
by bga
Thu, 07 Jul 2011, 18:33
Forum: Members Machines
Topic: Bruce Armstrong's BMW E30
Replies: 17
Views: 5399

Bruce Armstrong's BMW E30

The crappy hand soldering had largely disappeared in the second batch of 40 sets, with almost no defects. A bit of practice and more 'system' in the assembly helped a lot. One set of LEDs in backwards and a few dry joints. There have been a few funnies, though: There is about 0.2V of noise on Cell2'...
by bga
Mon, 04 Jul 2011, 17:55
Forum: Batteries, charging, management and monitoring
Topic: After-build add-on Power Factor Correction
Replies: 12
Views: 2988

After-build add-on Power Factor Correction

I thought about this problem.... I opted for 2 x ELCON at 312V so that I could add some extra cells if needed. The 2000 watt was very close in weight and price to the 1500, so I went for the extra power. The 2 Elcons should be able to draw 4000 watts on a cool day with suitably aligned planets. (312...
by bga
Sun, 03 Jul 2011, 06:39
Forum: Batteries, charging, management and monitoring
Topic: After-build add-on Power Factor Correction
Replies: 12
Views: 2988

After-build add-on Power Factor Correction

I haven't got them running yet. I haven't even hacked for my application. The comment was from a blog I read some time ago. I probably won't investigate this unless it looks to be an issue. 0.99 is pretty good. -- is the solution to replace the ute charger with one of these? For my own setup, I was ...
by bga
Sun, 03 Jul 2011, 06:09
Forum: Members Machines
Topic: Bruce Armstrong's BMW E30
Replies: 17
Views: 5399

Bruce Armstrong's BMW E30

Testing times... I've given up for the evening to briefly concentrate on preparing for an orienteeirng event tomorrow, by programming the event computer, hitching the potra-dunny up to the car and organising something for the cake stall. Usually this only involves getting motivated and out early in ...
by bga
Fri, 01 Jul 2011, 15:59
Forum: Batteries, charging, management and monitoring
Topic: After-build add-on Power Factor Correction
Replies: 12
Views: 2988

After-build add-on Power Factor Correction

The first question answer would have to be "Why bother?" - It's only one EV charger. - Do the utilities really care about one little ~2kW load that looks a lot like a few PCs? Then after that, Would a passive capacitor or inductor network work as a retrofit? I bought a couple of Elcon chargers (two ...
by bga
Thu, 30 Jun 2011, 15:33
Forum: Electric motors and controllers
Topic: My homebuilt VFD progress
Replies: 141
Views: 18786

My homebuilt VFD progress

Yes I'd generally agree with both of you. When I came across this stuff I remember reading that the Gate drive system should be designed to detect the gate overcurrent and latch the event in the same way it would for a desat event. It is designed to replace desaturation systems and is supposed to b...
by bga
Tue, 28 Jun 2011, 15:46
Forum: Electric motors and controllers
Topic: My homebuilt VFD progress
Replies: 141
Views: 18786

My homebuilt VFD progress

I'd go for one cycle, maybe two if you're lucky! It points to an order of precedence in the design and implementation: The protection (and shutdown) mechanisms need to be well tested and reliable before proceeding to anything else. Any DESAT event is akin to having a hand gun go off while you're cle...
by bga
Tue, 28 Jun 2011, 00:43
Forum: Technical and conversion discussion
Topic: AC vs`DC debate
Replies: 25
Views: 4775

AC vs`DC debate

Looks like Buster Senior got busted in that one.

Before Ralph Nader's time?
by bga
Mon, 27 Jun 2011, 23:53
Forum: Electric motors and controllers
Topic: Shaft encoder IC
Replies: 2
Views: 1699

Shaft encoder IC

I will have a go at making a transmitter for this chip as soon as I get the motor inside the garage. I need to complete the BMS first so there aren't too many elements of the project running at once. TO be decided are the signal levels and index pulse. The idea wil be to make the interface look like...
by bga
Mon, 27 Jun 2011, 23:32
Forum: Electric motors and controllers
Topic: My homebuilt VFD progress
Replies: 141
Views: 18786

My homebuilt VFD progress

That's interesting. from www.pwrx.com: "Mitsubishi Electric Power Module for Hybrid & Electric Vehicles is Now Available in the Americas from Powerex. read more " That would explain the familiar part number! It looks like DY designation doesn't have the protection circuit and DU designations do. I d...
by bga
Mon, 27 Jun 2011, 21:16
Forum: Electric motors and controllers
Topic: My homebuilt VFD progress
Replies: 141
Views: 18786

My homebuilt VFD progress

I don't know of any big IGBTs that have in-built protection. None even have Zeners across the gate to stop it getting blown up when handling the device. (very sensitive to over-voltage on the gate) Many (most?) power IGBTs have some short circuit tolerance, ususally in the 10 microsecond range. This...
by bga
Mon, 27 Jun 2011, 18:08
Forum: Electric motors and controllers
Topic: My homebuilt VFD progress
Replies: 141
Views: 18786

My homebuilt VFD progress

Hi all, The main reason I would go for 500 PPR is for the very low speed performance, particularly position holding to prevent roll back on hill starts. (Position holding isn't quite true, as there has to be a means of unloading the motor when the brakes are applied) The other reason is to prevent a...
by bga
Mon, 27 Jun 2011, 16:46
Forum: EV Racing
Topic: Burnouts in an electric drag car
Replies: 25
Views: 5756

Burnouts in an electric drag car

All this talk about Burnouts makes me feel decidedly uneasy. Peerhaps it's the smell of the smoke and all those dead transistors. -- the other sort of burnout. The problem is that the control system *has* to be closed loop to achieve good dynamic behavior, this can be analog or digital, but digital ...