Search found 421 matches

by zeva
Mon, 19 Aug 2013, 19:57
Forum: AEVA WA Branch
Topic: conversion advice please!
Replies: 2
Views: 744

conversion advice please!

Lapsed rego won't make much difference for the licensing process because when the time comes to get it re-licensed as an electric vehicle, the car has to pass a normal pit inspection anyway. You'd just have to get a Temporary Movement Permit to get it down to the pits if it is out of license. Howeve...
by zeva
Sat, 20 Jul 2013, 20:35
Forum: For Sale/Wanted
Topic: FS: Alltrax AXE4834 controller, near new, $150
Replies: 5
Views: 485

FS: Alltrax AXE4834 controller, near new, $150

Hi all, I recently purchased an Alltrax AXE4834 motor controller from EV Works on behalf of a client for use in an electric trolley, but they ended up wanting more torque so I had to upgrade them to a controller with more amps on tap. As such I now have a spare AXE4834 here, near new, with only a mo...
by zeva
Fri, 19 Jul 2013, 22:48
Forum: Members Machines
Topic: Glenn_aircooled Project tricycle
Replies: 40
Views: 3539

Glenn_aircooled Project tricycle

Reminds me of an old saying: There are three types of liars in the world. Liars, damned liars, and battery manufacturers! It's a pity there's no regulation on claims of battery capacity. Wouldn't it be great if there was an online database of independent test results for all the various cells availa...
by zeva
Wed, 26 Jun 2013, 19:27
Forum: Members Machines
Topic: Johny's Electric Vogue
Replies: 287
Views: 40275

Johny's Electric Vogue

Seems like a reasonable hypothesis. I can confirm that damaging devices from shoot through as a result of diode turn-off being slower than transistor turn-on is a real danger when using gate resistors around 10ohms (relative to your 100nC gate charge). I've blown up devices in similar ways before. I...
by zeva
Tue, 25 Jun 2013, 00:14
Forum: Members Machines
Topic: Johny's Electric Vogue
Replies: 287
Views: 40275

Johny's Electric Vogue

Capacitive load hey... so, turn it into a proper buck converter with added output inductor, and switch faster (like 20kHz)? Edit: On further consideration, I don't see how a capacitive load could explain the blown freewheel diode as well as the IGBT. The load might have acted enough like a short cir...
by zeva
Sun, 23 Jun 2013, 19:35
Forum: General EV Discussion
Topic: WA EV trial report
Replies: 4
Views: 571

WA EV trial report

This seems to be almost twice the consumption of higher efficiency AC motored EVs with regen braking etc. A point worth noting for the EV conversion industry. I think we're talking apples and oranges here. The Focus is not a small car. An more interesting comparison, I think, is with the production...
by zeva
Sun, 23 Jun 2013, 01:47
Forum: For Sale/Wanted
Topic: A few Tri-win DC40D-1250 water pumps, $30ea
Replies: 4
Views: 348

A few Tri-win DC40D-1250 water pumps, $30ea

Hi TJ,

Rated for 60degC - a little marginal for a cooling circuit I'll admit, certainly couldn't use it to water cool an ICE, but it is probably good to keep EV gear running below this temp anyway!?
by zeva
Sat, 22 Jun 2013, 04:34
Forum: For Sale/Wanted
Topic: A few Tri-win DC40D-1250 water pumps, $30ea
Replies: 4
Views: 348

A few Tri-win DC40D-1250 water pumps, $30ea

Hi all, I recently looked into getting a small pump for the water cooling circuit in my RX7, and after a bit of a hunt found a model with the right specs from a company called Tri-win. Unfortunately their minimum order was 5pcs, so I have 4pcs spare! So, does anyone need a cheap water pump (for moto...
by zeva
Sat, 15 Jun 2013, 03:18
Forum: Technical and conversion discussion
Topic: 70mm^2 Shielded Cable
Replies: 6
Views: 1626

70mm^2 Shielded Cable

Here in OZ, Huber Suhner may be an option. Check the Automotive Products catalogue link on the right of this page: http://www.hubersuhner.com/en/Products/Low-Frequency/Signal-and-Power-Cables e.g their "Radox" series screened battery cable, available up to 150sqmm. It may be hideously expensive thou...
by zeva
Thu, 06 Jun 2013, 21:49
Forum: Technical and conversion discussion
Topic: EV200 vs LEV200 contactors
Replies: 10
Views: 1707

EV200 vs LEV200 contactors

Pretty sure that is the primary difference, the LEVs don't have a coil economiser so use a bit more power when energised.

I'm more a fan of the EV200. Using 2W instead of 15W for the coil means they run cooler and should last longer.
by zeva
Thu, 30 May 2013, 04:23
Forum: Members Machines
Topic: StudentEV's Daihatsu Conversion
Replies: 106
Views: 9976

StudentEV's Daihatsu Conversion

The manual does list "hardware over-current protection", so I wonder if it would do it if I dialed down the maximum current in the software? I think at the moment I don't have a maximum current set. That does sound like a hardware over-current system tripping. Most modern controllers have a softwar...
by zeva
Wed, 29 May 2013, 03:09
Forum: Members Machines
Topic: StudentEV's Daihatsu Conversion
Replies: 106
Views: 9976

StudentEV's Daihatsu Conversion

Kellys don't last long enough to be second hand http://forums.aeva.asn.au/smileys/smiley2.gif (Sort of joking, though I have witnessed a lot of failures over the years. Also the ones in the little silver cases lack the sustained power you need in a car, and the bigger ones seem to have a clumsy curr...
by zeva
Sat, 25 May 2013, 23:16
Forum: Members Machines
Topic: Ian Hooper's RX7 Conversion
Replies: 102
Views: 23311

Ian Hooper's RX7 Conversion

Oh man. I just need to vent.. After the driveshaft coupling came apart again a few weeks back, I had a new extra-beefy one made at great expense. Installed that today, went for a test drive, coupling seems good.. Then the Zilla packs it in again with the same old comms error which I thought was fixe...
by zeva
Mon, 20 May 2013, 04:39
Forum: Members Machines
Topic: Renard's BMW
Replies: 237
Views: 28168

Renard's BMW

The 0.47uF capacitor across IGBT probably isn't doing much harm nor good, except maybe harm to itself, and possibly a small amount of snubbing. Either way I'd be inclined to remove it, or put it in series with say a 10ohm resistor to make a proper RC snubber. What's your switching frequency? If you'...
by zeva
Sat, 11 May 2013, 20:26
Forum: Technical and conversion discussion
Topic: Some "don'ts" for EV building
Replies: 60
Views: 11315

Some "don'ts" for EV building

Don't be overambitious Or accept that your project will end up taking longer, costing more, and with a higher chance of failures. Simple designs are easier to build, maintain, and are usually more reliable. Unless you enjoy extensive troubleshooting, it is best to use well-proven, off the shelf com...
by zeva
Sun, 14 Apr 2013, 18:30
Forum: Technical and conversion discussion
Topic: Wanted: short busbar standoffs
Replies: 6
Views: 1339

Wanted: short busbar standoffs

Doesn't look like something that'd be too hard to make. Here's a piece of copper stock that might do the trick? http://www.ebay.com.au/itm/Copper-Bar-3-4-dia-x-250-mm-Steam-Sculpture-OG-/251255416967?pt=AU_Supplies&hash=item3a7ffd6887&_uhb=1#ht_500wt_1057 Edit: Or, get one of those 35mm ones and cut...
by zeva
Sun, 14 Apr 2013, 05:40
Forum: EV Motoring
Topic: Mercedes SLS Electric Drive
Replies: 5
Views: 882

Mercedes SLS Electric Drive

It is a very slick machine, I like it a lot. Way out of the price range of normal people, but a great demonstration of things to come. I look forward to the day when I can get a 4WD electric car with torque vectoring (or I might just have to make one). I think it is a shame though that the thing end...
by zeva
Mon, 08 Apr 2013, 00:48
Forum: Batteries, charging, management and monitoring
Topic: Controlling the 12v aux battery
Replies: 10
Views: 1923

Controlling the 12v aux battery

It will be interesting to see how low you can get the current usage on this device. Adding any current draw at all to my 75mA will make the battery flatten even quicker. I note that according to the manual, the FGD+ draws about 35mA - so there is about half my usage! The low voltage cutout draws ve...
by zeva
Sun, 07 Apr 2013, 02:33
Forum: Batteries, charging, management and monitoring
Topic: Controlling the 12v aux battery
Replies: 10
Views: 1923

Controlling the 12v aux battery

I certainly agree that the IOTAs are not an ideal solution, being originally designed to run off AC, and being far from weatherproof. But they've always been good value and have been used in a *lot* of EVs over the years, for the most part giving pretty reliable service. Back when I was with EV Work...
by zeva
Sun, 07 Apr 2013, 00:22
Forum: Batteries, charging, management and monitoring
Topic: Controlling the 12v aux battery
Replies: 10
Views: 1923

Controlling the 12v aux battery

For the RX7 I'm using an IOTA DLS-55 HV DC/DC converter. I have two contactors in the vehicle, one (with precharge) for the motor controller, and an auxiliary contactor mid-pack (located at the +ve side of the rear pack) which effectively splits the pack voltage in half, and stops all loads on the H...
by zeva
Sat, 06 Apr 2013, 19:06
Forum: Members Machines
Topic: Ian Hooper's RX7 Conversion
Replies: 102
Views: 23311

Ian Hooper's RX7 Conversion

I'll get the prototype into the RX7 today and see how it goes. If it works as it should, I'm happy to send one your way for mates' rates http://forums.aeva.asn.au/smileys/smiley1.gif It basically has a comparator holding a power MOSFET closed whenever input voltage is above 12V, with a very slow res...
by zeva
Fri, 05 Apr 2013, 07:41
Forum: Members Machines
Topic: Ian Hooper's RX7 Conversion
Replies: 102
Views: 23311

Ian Hooper's RX7 Conversion

Hi all, First, the big news: The RX7 passed its pit inspection today and is officially road legal & licensed! http://forums.aeva.asn.au/smileys/smiley32.gif Not the most trouble-free process, quite a few hiccups along the way, but great to have this milestone done so I can start driving the car regu...
by zeva
Tue, 02 Apr 2013, 22:07
Forum: Members Machines
Topic: seligtype3 1969 Volkswagen Type 3
Replies: 194
Views: 40418

seligtype3 1969 Volkswagen Type 3

Quick question to those who know what they're doing - my Iota DLS-55 HV DC/DC converter has input leads that unplug and are not marked for polarity. Does anyone know if these things are polarity sensitive and if so how would I safely ascertain which way it might be? Hi Selig, I can confirm that the...
by zeva
Mon, 11 Mar 2013, 05:36
Forum: AEVA WA Branch
Topic: Electrikhana 2013!
Replies: 10
Views: 1792

Electrikhana 2013!

Just stopped by to say a big thanks to everyone involved with organising and running Electrikhana 2013. It seemed like a very successful event, with EVs being test-driven around the track all afternoon, and plenty of great vehicles on display. I enjoyed bringing the RX7 along (albeit driving on a bo...
by zeva
Thu, 31 Jan 2013, 22:53
Forum: Members Machines
Topic: Weber and Coulomb's MX-5
Replies: 1698
Views: 337645

Weber and Coulomb's MX-5

What did you do to your MX-5 that made 300 mm disks advisable? And where does one get 300 mm disks for an MX-5? I came across this supplier when I was looking into the same thing a few years back for my MX5-EV: http://www.mx5mania.com/brakes.htm Would you say that 50:50 front:rear was very importan...