Thank you for your interest in EV's. By way of an introduction the savings associated with driving an EV include 40% or around $500 per year on servicing because no tune ups or oil changes are needed. In addition, at off-peak electricity rates EV's cost around $1.20 per 100 km (you need an off-peak service for this otherwise calculate on 14cents per kw). You can try our online calculator to get an idea on your potential savings over three years:- http://www.bev.com.au/ev_calculator.htm. Not to forget that when off-set with green energy EV's are a zero emission vehicle.
Maximum range is around 200km and costs $35,000 for the conversion and yes half of that is the batteries. Personally I believe that EV's make ideal urban run-abouts for commuting and the like. In this context the battery packs are far more economical and last longer - up to 8 years.
If I can be of any assistance please feel free to write again or call me on 02 8214 8916 / 0410 49 2195
Regards,
Ross Blade
Yeh Right
Fri Apr 06, 2007 8:51 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
Does anyone know why they use Advanced DC motors instead of AC motors? When I was last looking at motors a 3kW DC motor was $3000, while a 3kW AC motor was $600? Is the cost of a regenerative 3 phase controller prohibitive, or are three phase motors just a scary concept???
Fri Apr 06, 2007 10:13 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
probably because there is huge losses converting the DC power into AC for the motor or some such like that. after all the batteries are dc so i guess its just simpler to stick with that then go with all the other inverting gear cost wise too _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Fri Apr 06, 2007 10:49 pm
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
there isnt much difference between a brushless DC and an AC motor from the controllers POV ;->
AC motor will be less efficent though as a rule. especially at low speeds.
I believe those guys leave the gearbox and everything in place so you still use a reverse gear to go backwards, this means their controller is *really* simple, just one block of fets, no H-bridges. _________________ Mechanical engineers build weapons, civil engineers build targets
Fri Apr 06, 2007 11:40 pm
Fish_in_a_Barrel
Joined: 30 Sep 2006
Posts: 673
Location: Perth, Western Australia
I was having just the same discussion with a friend at uni. If you were to have a 340V bus running a 310V DC motor and a 314V (peak) 3 phase motor, they will have approximately the same switching losses.
I googled it, and I think it's due to efficiency, however AC wins in longevity.
(I really want to do an electric conversion, I just don't have the money or the car right now. I'll start off with my electric bike)
Fri Apr 06, 2007 11:43 pm
zx12r
Joined: 19 Mar 2007
Posts: 55
oh yes of course
i was gonna mention the fets and h bridges (wtf )
the difference between you guys and me is that you may actually know what your talking about
I on the other hand dont but if given a good set of instructions can make do with my limited skills
but as soon as it comes to those blooody fets and h bridges man, im rooted
any pics of your electric bike BH Mike ?
Sat Apr 07, 2007 8:54 am
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