Search found 2613 matches

by antiscab
Tue, 16 Sep 2008, 15:09
Forum: General EV Discussion
Topic: Wh/km
Replies: 3
Views: 832

Wh/km

Hi Gow,

i can give you a data point.
on my emax i get an average (since last week when i started recording) of 43.7wh/km at sustained speeds of 60-70kmh including head winds and hills.

from the mains my average (for the past week) is 64.1wh/km.

Matt
by antiscab
Mon, 15 Sep 2008, 17:33
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3832

formula

Hi Tone, the weight in batteries is proportional to energy stored. 20kwh at 144v will weigh the same as 20kwh at 600v. The total weight in copper needed for the wiring is also related to the amount of power you need to transmit. halving the voltage will need half the interconnects, and thus half the...
by antiscab
Mon, 15 Sep 2008, 16:45
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3832

formula

hi Tone, is the 700kg the final weight? or the weight of the vehicle without any EV components in it? or the weight without any ICE components removed. what is your definition of low voltage? what is the reasoning behind it? i normally suggest DC conversions to be no lower than 144v. Its not that lo...
by antiscab
Mon, 15 Sep 2008, 05:37
Forum: General EV Discussion
Topic: formula
Replies: 33
Views: 3832

formula

hi Tone, what vehicle are you planning on converting? here are a few shortcuts to wokring some things out: battery capacity: you need 2kwh for every L per 100km the car used when it ran on petrol. battery voltage: use 144v, unless you have access to a higher voltage controller, or are going AC. moto...
by antiscab
Thu, 11 Sep 2008, 04:47
Forum: Scooters, mopeds and electric toys
Topic: Pocket Bike conversion
Replies: 7
Views: 3364

Pocket Bike conversion

ah ok, so its more of a low power, non-road going type setup.
not sure i can give you a definate answer on this one.
you might try having a look at the endlessphere forums.

just note that 200w is the legal limit for un-licenced bikes.

Matt
by antiscab
Thu, 11 Sep 2008, 03:54
Forum: Scooters, mopeds and electric toys
Topic: Pocket Bike conversion
Replies: 7
Views: 3364

Pocket Bike conversion

49cc two stroke is about 6kw (if its a good quality one). 4 stroke 49cc is around 3.5kw. on my moped, i use 60v, 70A for just shy of 4kw (when you take into account voltage sag). Energy use depends on how fast you go. for me, with throttle full all the time, for half an hour (30km or so of riding), ...
by antiscab
Sat, 06 Sep 2008, 04:08
Forum: Technical and conversion discussion
Topic: Air Con and Power Steering
Replies: 13
Views: 2223

Air Con and Power Steering

yup, id have to agree.
2kw vfds are really cheap, so are the motors, probably even cheaper to buy than a DC unit.

Mattt
by antiscab
Fri, 05 Sep 2008, 05:28
Forum: General EV Discussion
Topic: CVT & IVT Gearboxes
Replies: 18
Views: 1944

CVT & IVT Gearboxes

Hi Gow, 500A through a warp 11 direct to diff was fairly sufficient acceleration in a mx5 in my experience. you remove some inefficiency by eliminating the gearbox. there is no single ratio gearbox. the differential usually has a built in ratio. the torque needed is always higher than with a gearbox...
by antiscab
Fri, 05 Sep 2008, 04:58
Forum: General EV Discussion
Topic: Motor Choices For Electric Motorbikes
Replies: 2
Views: 576

Motor Choices For Electric Motorbikes

Gday geoff, to get 50hp out of thundersky you will need 144v90AH 150kg. youll get loads of range (130km+)...but for a sports bike, heavy. 50hp out of K2 cells welded together you need 144v 25AH, 45kg. range not so great (45km), but power and weight are ok. the upside to having a bike, batteries are ...
by antiscab
Fri, 05 Sep 2008, 04:34
Forum: Technical and conversion discussion
Topic: Best car characteritics for EV?
Replies: 11
Views: 1974

Best car characteritics for EV?

Hi Plugger, re the gearbox, you could use the gearbox leak as a bargaining chip for a lower price. retaining the gearbox is only the cheapest route if you already have a good and usable one. If you dont, then getting a gear box costs around the same as getting a more powerful motor/conrtoller and go...
by antiscab
Thu, 04 Sep 2008, 05:23
Forum: Technical and conversion discussion
Topic: Air Con and Power Steering
Replies: 13
Views: 2223

Air Con and Power Steering

not sure this counts as a data point,
but i will be using a 2kw 3-phase induction motor driven compressor for mine, or there abouts. (for 12kw of heat loss) Image

Matt
by antiscab
Thu, 04 Sep 2008, 05:20
Forum: Technical and conversion discussion
Topic: Air Con and Power Steering
Replies: 13
Views: 2223

Air Con and Power Steering

the AC in a car needs to be so powerfull for several reasons: 1) the starting temperature is almost always fairly high 2) cars have almost useless levels on insulation (think heat gain of 4kw+) 3) we all expect them to be cool within minutes, or well get to our destination before it cools down. 4) w...
by antiscab
Mon, 01 Sep 2008, 05:54
Forum: General EV Discussion
Topic: working through compliance issues ADRs , NCOP14
Replies: 10
Views: 1469

working through compliance issues ADRs , NCOP14

im surprised pot boxes are still being considered by EV converters.
why not a HEPA?

Matt
by antiscab
Mon, 01 Sep 2008, 00:41
Forum: Technical and conversion discussion
Topic: Tachometers in EVs
Replies: 13
Views: 2229

Tachometers in EVs

Hi plugger, very little power is developed by an adc 9" (FB4001) at 7k rpm. ideally in 5th at 100kmh you would want a rotational speed of 3-4k rpm. since you are keeping the gearbox, getting it perfectly ratioed isnt quite as important. go for a bigger motor if it will fit. the larger the motor the ...
by antiscab
Sun, 31 Aug 2008, 23:15
Forum: Technical and conversion discussion
Topic: Best car characteritics for EV?
Replies: 11
Views: 1974

Best car characteritics for EV?

I would steer clear of parralleling cells if possible. having more than one string makes the wiring more complicated. you are better off with either 160AH or 200AH units than 2x90AH strings. 150wh/km from the batteries should be about right for an excel or similar small car. is there any possibility...
by antiscab
Sun, 31 Aug 2008, 22:45
Forum: Technical and conversion discussion
Topic: Tachometers in EVs
Replies: 13
Views: 2229

Tachometers in EVs

Hi Plugger,

what electric motor are you using that can go to 9k?
are you planning on retaining the gearbox?

whether the tacho will work post conversion will depend largely upon your choice of donor vehicle.

Matt
by antiscab
Mon, 25 Aug 2008, 06:49
Forum: General EV Discussion
Topic: Going AC thanks 2 you guys!!!
Replies: 69
Views: 8441

Going AC thanks 2 you guys!!!

hi richo,

200x ts lfp40s is only 300kg, why would you need to remove the back seat?
robs latest 318i converison has 290kg of lithium in it, and the back seat is being retained. (of course it hasnt gone through rego just yet)

Matt
by antiscab
Mon, 25 Aug 2008, 00:36
Forum: Non-Branch areas
Topic: QLD Branch
Replies: 42
Views: 14875

QLD Branch

Hi Ken, if you are going the dc motor route, you would probably be after something like an adc L-91 6.7". to run it properly, you would want around 120v. i havent actually seen any of the K2 cells assembled into packs yet, but based on their ratings would seem to do the trick. I heard a rumour Ian w...
by antiscab
Sun, 24 Aug 2008, 07:59
Forum: Non-Branch areas
Topic: QLD Branch
Replies: 42
Views: 14875

QLD Branch

gday tropicalev, yes a kw is a kw, but the different torque curves make comparisons a little more complicated. since we (as in the ev crowd) are usuall more battery limited in the way of power, a kw peak from a electric motor is worth more than a kw peak from a ICE motor, as the peak on an electric ...
by antiscab
Sun, 24 Aug 2008, 07:45
Forum: General EV Discussion
Topic: Going AC thanks 2 you guys!!!
Replies: 69
Views: 8441

Going AC thanks 2 you guys!!!

just one point,
if you aim for a range of 60km, your average dishcharge will be 1C or more.
ac 1C or more, count on 3vpc as the nominal voltage for energy available/range considerations.

Matt
by antiscab
Sun, 24 Aug 2008, 07:42
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 17899

Industrial AC Controllers + Rated Torque/Power

Hi tuarn,

does that mean you have already hooked up the lithium cells to your vfd?
or are you some how getting around 700v from your henda batts to your vfd?
otherwse how are you getting 500v at the motor?


Matt
by antiscab
Tue, 19 Aug 2008, 05:13
Forum: General EV Discussion
Topic: To get EV registered
Replies: 58
Views: 5987

To get EV registered

Hi Goombi, good idea with the battery placement. one thing you have to watch out for with monocoque frame cars is that its strength changes in unusual ways when you cut into them. the whole point of having a monocoque frame is so that there is no main frame. i know alot of the body "anti-sway" stiff...
by antiscab
Tue, 19 Aug 2008, 04:19
Forum: Technical and conversion discussion
Topic: Reality check on motor/battery/donor combo please!
Replies: 13
Views: 5831

Reality check on motor/battery/donor combo please!

Hi Peter, most controllers allow you to set battery and motor current limits independantly. i know for a fact, the zilla controllers can have independant current limits. a 90AH cell only sags to 2.6v at 270A. (or 117v for a 144v nom pack, 31.6kw) at 450A, cell voltage is 2.2-2.3v (or 99v for a 144v ...
by antiscab
Tue, 19 Aug 2008, 04:11
Forum: Technical and conversion discussion
Topic: Reality check on motor/battery/donor combo please!
Replies: 13
Views: 5831

Reality check on motor/battery/donor combo please!

a few points of clarification: assuming the control has good ripple caps on the input side, and the motor has a reasonalbe amount of inductance, the controller controls, motor and battery side current independantly. so 200A at the motor may be only 30A at the batteries at low speed. under cruising c...
by antiscab
Tue, 19 Aug 2008, 04:02
Forum: Admin Notices
Topic: Email notifications not working
Replies: 3
Views: 1405

Email notifications not working

Hi Mal,

when the main server went down, Andrew had to switch the forums to the backup server.
while we're on the backup servers, all sorts of things wont work right.
email notifications of any kind are on the things that dont work.

should be fixed when the main server is back up.

Matt