Search found 492 matches

by bga
Wed, 26 Sep 2012, 18:54
Forum: EV Motoring
Topic: DeLorean EV - factory version
Replies: 2
Views: 1542

DeLorean EV - factory version

A new video on the electric Delorean, complete with a factory-warehouse tour
http://www.greencarreports.com/news/107 ... inal-video

by bga
Tue, 04 Sep 2012, 17:25
Forum: General EV Discussion
Topic: Torquay EV Fire
Replies: 8
Views: 1604

Torquay EV Fire

There is a problem with differentiating battery chemistry in the consumer's mind! As we know, the cathodes vary greatly in their stability. There does seem to be a relation between energy density and stability, with the desirable high energy designs being the most sensitive to abuse. This principle ...
by bga
Thu, 30 Aug 2012, 17:10
Forum: Batteries, charging, management and monitoring
Topic: Envia Systems' battery (400wh/kg)
Replies: 0
Views: 681

Envia Systems' battery (400wh/kg)

Here's a new battery cathode material from Envia Systems. This looks promising.

They are currently showing 45AH prototype cells.

See here:

Envia Systems' homepage
by bga
Wed, 22 Aug 2012, 16:36
Forum: Electric motors and controllers
Topic: 3-phase IM DTC controller build
Replies: 92
Views: 13242

3-phase IM DTC controller build

No, Grrr, that's next cab off the rank.

Just need a respite from cold weather and 12 hour days now.
by bga
Wed, 22 Aug 2012, 01:52
Forum: Electric motors and controllers
Topic: 3-phase IM DTC controller build
Replies: 92
Views: 13242

3-phase IM DTC controller build

Very good, carry on.... http://forums.aeva.asn.au/smileys/smiley1.gif As you say, these are the practice IGBTs and are more or less expendable. Starting off at low volts and limited current, such as from a power supply or some smallish SLA batteries (regen voltage limiting) may save a lot of grief i...
by bga
Tue, 21 Aug 2012, 18:40
Forum: Electric motors and controllers
Topic: 3-phase IM DTC controller build
Replies: 92
Views: 13242

3-phase IM DTC controller build

Yes, desat protection is needed. The hall sensor approach will not be fast enough to save the transistors from a short circuit. I originally identified : AVAGO HCPL-316J as an appropriate gate driver. This has desat event latching with indication and clear lines to controller as well as undervolts l...
by bga
Fri, 17 Aug 2012, 16:04
Forum: EV Motoring
Topic: Tesla Model S Shown Publicly
Replies: 10
Views: 2305

Tesla Model S Shown Publicly

A copper rotor induction motor is a good thing to see in an electric car, because it avoids a dependency on rare earths that look increasingly to be controlled by the Chinese and likely to be in short supply. Does anybody know what typical efficiency they are able to achieve with this? I am a little...
by bga
Tue, 14 Aug 2012, 17:20
Forum: Electric motors and controllers
Topic: Getting the right windings...
Replies: 77
Views: 12361

Getting the right windings...

Hi Back, The slightly higher power density of 2-pole over the 4-pole and hence the 2-pole's greater suitability with a multi-ratio gearbox only applies when the 2 and 4 pole have the same volts-per-hertz winding ratio, e.g. when they are both wound for 230 V 50 Hz. It was only because we didn't know...
by bga
Mon, 13 Aug 2012, 15:30
Forum: Electric motors and controllers
Topic: Getting the right windings...
Replies: 77
Views: 12361

Getting the right windings...

Where's ACMotor when you need him? I remember that Tuarn did a survey of power density and torque for various induction motors a few years back and came to the conclusion that 4-pole offered the best torque density. I recall that another factor in his observation was that 4-pole offers a wider usefu...
by bga
Fri, 10 Aug 2012, 16:07
Forum: The Lounge
Topic: Carbon Tax on Green Energy
Replies: 29
Views: 4409

Carbon Tax on Green Energy

More novel (stupid?) ideas from me: Suppose that, instead of a 'supply charge', electricity suppliers started with a supply credit, say $100 per period and then charged more per kwh for electricity, set so that the 'average' consumer sees no penalty. This would have the effect of rewarding those ide...
by bga
Fri, 10 Aug 2012, 15:51
Forum: The Lounge
Topic: Pedestrian management
Replies: 4
Views: 1009

Pedestrian management

Ahhh, good...

A perfect application for that metal mesh underware I invented Image

(Apologies to Tom Swift)

TASER = Thomas A Swift's Electric Rifle
        From "Tom Swift and his Electric Rifle"
by bga
Tue, 24 Jul 2012, 16:23
Forum: Batteries, charging, management and monitoring
Topic: How to test/rejuvinate second hand batteries
Replies: 5
Views: 3475

How to test/rejuvinate second hand batteries

After finding some working bateries, the next problem is what to do with them. By the time they get too tired to drive a golf cart, they won't be much use in an EV, so a (rest) home application is needed. I did this with the battery from a big UPS by putting them in a home SPS, but a supply of 'fres...
by bga
Fri, 13 Jul 2012, 16:45
Forum: The Lounge
Topic: Carbon Tax on Green Energy
Replies: 29
Views: 4409

Carbon Tax on Green Energy

Hi Juk, I have a very similar letter on file. Perhaps this story in the climate spectator may help to explain why the PV solar deal is so poor: Could switching off a light bankrupt energy retailer Quote from the above: ... That is a very strong price signal, and testifies to the effectiveness of an ...
by bga
Fri, 13 Jul 2012, 15:43
Forum: Batteries, charging, management and monitoring
Topic: Solar Power and Batteries
Replies: 11
Views: 3058

Solar Power and Batteries

Now to kill off the alt-backspace key that causes lost edits in this forum. That was a bit of a lose! I downloaded a utility called SharpKeys from RandyRants. It is good at turning off some of the navigation keys like the 'web page back' key that's immediately next to the left arrow key. One touch ...
by bga
Tue, 10 Jul 2012, 18:49
Forum: The Lounge
Topic: Carbon Tax on Green Energy
Replies: 29
Views: 4409

Carbon Tax on Green Energy

With the withdrawl any explicit feedin subsidies, the miserable RE feedin tariff (currently 0.07/kwh) is now exposed and subject to the scrutiny and criticism of consumers. There doesn't seem to have been much public comment about this yet. The feedin tariff should be set to encourage desirable ener...
by bga
Tue, 10 Jul 2012, 02:26
Forum: Batteries, charging, management and monitoring
Topic: Solar Power and Batteries
Replies: 11
Views: 3058

Solar Power and Batteries

NiFe and also flooded NiCd are really robust 25 to 50 year prospects, so possibly good value over a lifetime. 2 cubic metres is about right for a lead acid set. I dream of a battery room, maybe next renovation... One issuse with LiFePo vs PbSO4 is the working depth of discharge and reserve capacity....
by bga
Tue, 10 Jul 2012, 01:24
Forum: The Lounge
Topic: Carbon Tax on Green Energy
Replies: 29
Views: 4409

Carbon Tax on Green Energy

That's supposed to be idea that there's a correspondence of kwhs over the period with the grid and all of the brown customers acting as a battery to buffer the accounting of the green energy**. Last time I checked, my bank was not having trouble quarantining my finances from my neighbor's and they h...
by bga
Sat, 07 Jul 2012, 22:21
Forum: EV Motoring
Topic: Oz Electric Delorean
Replies: 6
Views: 1698

Oz Electric Delorean

The facebook link is interesting. Note how nicely the delorean comes apart for working on.
by bga
Fri, 06 Jul 2012, 15:43
Forum: The Lounge
Topic: Carbon Tax on Green Energy
Replies: 29
Views: 4409

Carbon Tax on Green Energy

SYNERGY MUST DIE! For statements like this: "Our GreenPower customers receive a mix of energy - it's impractical and too expensive to have separate powerlines from renewable-only sources and given the intermittency of renewable energy," History will record that organisation is being run by a bunch ...
by bga
Thu, 05 Jul 2012, 16:48
Forum: Members Machines
Topic: Richo's AC Handi Sports
Replies: 84
Views: 12977

Richo's AC Handi Sports

Ha! very entertaining, T2 I have always thought that Canadian drivers are very polite compared to Western Australian drivers http://forums.aeva.asn.au/smileys/smiley1.gif As a thought; it's the winter that sorts out the real dills with all those snow drifts and slippery ice, not to mention Mooses. (...
by bga
Sat, 30 Jun 2012, 18:11
Forum: Technical and conversion discussion
Topic: Lead acid in 2012?
Replies: 5
Views: 1306

Lead acid in 2012?

Hi Randall, I think your battery price is quite good, certainly better that I saw in a quick web search. As a comparison, LiFePo (Thundersky) would cost abiout $5000 for a 160AH set. After this big disadvantage, the advantages of going for Lithium would be: Lifespan - I would expect to get at least ...
by bga
Fri, 08 Jun 2012, 18:55
Forum: EV Motoring
Topic: Would You Pay Sixty Grand for the Holden Volt?
Replies: 4
Views: 1354

Would You Pay Sixty Grand for the Holden Volt?

And that's the 'starting price'... Fuel economy (petrol) 3.8-4.8 l/100km My estimate is that electric charging (and 60km drive) equates to a petrol equivalent of about 2.5l/100km at today's prices It's going to take a lot of filling to make up the $35K price difference between the volt and a cruze (...
by bga
Tue, 05 Jun 2012, 20:26
Forum: Technical and conversion discussion
Topic: A Lurker's Ideas
Replies: 14
Views: 2450

A Lurker's Ideas

Hi Tony, Welcome to the forum. Where do I start... For motors, shops like EVWorks have a good range of ADC and KOSTOV DC motors that are purpose designed for EV applications, but not really any answers for AC drives. There are a few off the shelf options, but most opt for a retrained industrial driv...
by bga
Wed, 23 May 2012, 18:23
Forum: Electric motors and controllers
Topic: 3-phase IM DTC controller build
Replies: 92
Views: 13242

3-phase IM DTC controller build

Hi all, Richo and I bought some caps from EACO. They make film capswith a good spec and price. The problem is that the international shipping for small quantities negates any advantage in small orders. In 2009 my landed price for a box of 15 x 390uF/900V + a bunch of 2uF snubbers that bolt to the bu...
by bga
Mon, 30 Apr 2012, 02:18
Forum: Technical and conversion discussion
Topic: Brake testing
Replies: 13
Views: 2575

Brake testing

I think you need a new engineer. This guy's a twit! The panic stops are what it's about. These are dead easy to set up and test. - Two cones and a tape measure and 1/2 an hour. Are the vespa like a normal motor cycle with independent front and rear brakes? Balance between the front and rear brakes c...