Search found 683 matches

by Tritium_James
Mon, 09 Mar 2009, 18:45
Forum: Electric motors and controllers
Topic: Tritium Wavesculptor
Replies: 22
Views: 5215

Tritium Wavesculptor

Hey guys, I am probably qualified to comment on this one    http://forums.aeva.asn.au/smileys/smiley1.gif Yes, our 20kW drive is designed pretty much for solar cars. The design priorities are optimised for efficiency, reliability, weight, size, cost, in that order. For teams spending 500k+ on solarc...
by Tritium_James
Mon, 09 Mar 2009, 17:27
Forum: Technical and conversion discussion
Topic: DC to DC converters
Replies: 85
Views: 14477

DC to DC converters

I've just received a copy of the latest proposed revision of the NCOP, and the 20 minute requirement is gone. Along with nearly all the other new stuff (electrically activated HV shutdown, orange conduit, non-gassing battery enclosures). Since I put a large amount of work into the revision, I'm a li...
by Tritium_James
Mon, 09 Mar 2009, 17:07
Forum: Technical and conversion discussion
Topic: Accelerator Pedal Sensors
Replies: 41
Views: 5547

Accelerator Pedal Sensors

We've used an electronic throttle pedal assembly from a late model Honda Civic in the Porsche conversion. It's sealed, robust and has dual redundant outputs on it. You supply each section with 5V, and section A puts out 0.5 to 2.0V, and section B puts out 1.0 to 4.0V. B always = 2*A. This way you ca...
by Tritium_James
Fri, 06 Mar 2009, 04:19
Forum: General EV Discussion
Topic: E porsche with Analog Ac controller
Replies: 51
Views: 5409

E porsche with Analog Ac controller

Probably part of the waiting to put lithiums (or something else) in the car is that the existing PbA pack works, and probably has ten thousand more km in it, so why change now? I'd say when this one dies then the next pack won't be PbA! The gearbox is a tough call on if it's a good idea or not. For ...
by Tritium_James
Thu, 05 Mar 2009, 16:30
Forum: General EV Discussion
Topic: E porsche with Analog Ac controller
Replies: 51
Views: 5409

E porsche with Analog Ac controller

Hi guys (especially Woody!). It appears I've dived straight into some kind of long-running topic here - sorry! Oh well... The UN battery transport regs aren't freely available, but there's a good summary from Ultralife, available here: http://www.ultralifebatteries.com/documents/whitepapers/Ultralif...
by Tritium_James
Thu, 05 Mar 2009, 04:27
Forum: General EV Discussion
Topic: E porsche with Analog Ac controller
Replies: 51
Views: 5409

E porsche with Analog Ac controller

Well I'm only the temporary 'owner' of the Porsche, just while it's up here in Brisbane for the new gearbox and BMS. I've been driving it for the past few months, and probably a few more until we decide the gearbox is OK, and it can go back to it's real owner in Sydney - who I'm sure will be quite h...
by Tritium_James
Wed, 04 Mar 2009, 23:33
Forum: General EV Discussion
Topic: E porsche with Analog Ac controller
Replies: 51
Views: 5409

E porsche with Analog Ac controller

The 100Ah Kokam cells we have (they're not the safe phosphate chemistry though) are rated for 8C short term and 5C continuous. We have some smaller 12Ah ultra-high rate types (also from Kokam) that are rated for 20C in bursts. For a 100 cell pack that equates to 88kW. Not bad for a pack weight of 36...
by Tritium_James
Wed, 04 Mar 2009, 17:30
Forum: General EV Discussion
Topic: E porsche with Analog Ac controller
Replies: 51
Views: 5409

E porsche with Analog Ac controller

To answer some of the initial questions: yes, it's an AC Propulsion system, it was around US$25k for the motor and controller when originally purchased around 1999. The reason it's using lead-acid batteries is because that was all that was available at the time, capable of supplying the power requir...