Search found 2701 matches

by antiscab
Wed, 13 Aug 2008, 04:55
Forum: Batteries, charging, management and monitoring
Topic: problems with Odyssey pack
Replies: 9
Views: 1731

problems with Odyssey pack

you may have a few faults, lets see if we can separate them. your pack is way undersized for a car. at 1C you only have 7-8AH usable capacity. you are probably drawing faster than 1C continuous, so say 6AH. at such a fast discharge rate, the pack will sag, so you wont have 180v for much of the disch...
by antiscab
Wed, 13 Aug 2008, 04:29
Forum: General EV Discussion
Topic: The electric car that nobody wants.
Replies: 14
Views: 2637

The electric car that nobody wants.

im actually going to use a bmw diff 4.1:1 diff and bolt a kostov 11" directly to it. i only have 600mm of space between the centre of the diff and a cross member i cant cut into. a kostov 11 is 400mm the diff is about 220mm. im getting morrison engineering to machine the two together as one unit, ju...
by antiscab
Wed, 13 Aug 2008, 04:15
Forum: General EV Discussion
Topic: BMW 318 conversion
Replies: 6
Views: 1070

BMW 318 conversion

yeh its a good car to convert.
the speedo hook up is in the diff.
very simple to do.

ill take some pics of masons 318i for u 2morrow if you like?
PM your email address if your interested.
or alternatively just ask rob:p
by antiscab
Wed, 13 Aug 2008, 04:09
Forum: Technical and conversion discussion
Topic: Regen, can someone help
Replies: 29
Views: 4453

Regen, can someone help

sorry for coming across so harsh goombi.
on second read i could have done better.

i was trying to convey how a change in driving habits can reduce the effectiveness of regen, and improves range/mileage for any vehicle.
by antiscab
Wed, 13 Aug 2008, 03:28
Forum: Technical and conversion discussion
Topic: Regen, can someone help
Replies: 29
Views: 4453

Regen, can someone help

well caught richo,
it seems ive spent to much time over at the american forum.
everytime i c 60 i think mph :s

by antiscab
Tue, 12 Aug 2008, 18:23
Forum: Technical and conversion discussion
Topic: Regen, can someone help
Replies: 29
Views: 4453

Regen, can someone help

Goombi, 60kmh in 1300kg is 502kj. depleted over 6 seconds is 83.5kw. at 360v, thats 232A average (it will start out higher and fall as you go slower as its constant torque at the motor). 232A for 6 seconds is 0.387AH. at a nominal 288v, thats 111wh recovered (or in my case, just shy of 1km range). 6...
by antiscab
Tue, 12 Aug 2008, 06:19
Forum: Batteries, charging, management and monitoring
Topic: Parellel vs Series
Replies: 7
Views: 1685

Parellel vs Series

richo, y would you not want to parrallel the batteries first, the series them? most chinese scooters parrallel first, then series second. ive always questioned this. on the particular scooter i bought the 8 batteries never stayed properly balanced. part of the fix was to wire them in buddy pairs (ie...
by antiscab
Tue, 12 Aug 2008, 03:52
Forum: General EV Discussion
Topic: The electric car that nobody wants.
Replies: 14
Views: 2637

The electric car that nobody wants.

actually, one t-105 can be replaced with 2x 130AH LiFePO4. a 120v pack would weigh only 200kg:p t-105s shouldnt be discharged faster than about 400A peak 75A continuous, so 120v worth is 48kw peak, 9kw continuous. not exactly fast, but certainly very driveable. 40-50km range is when you're screaming...
by antiscab
Mon, 11 Aug 2008, 08:47
Forum: General EV Discussion
Topic: LPG/Natural gas generator backup & more
Replies: 12
Views: 2053

LPG/Natural gas generator backup & more

flooded lead acid are more forgiving when used by a beginner from a service life point of view. In a high voltage (48v+) environment, theyre also more dangerous due to the acid mist (which is conductive) they tend to form. If you look after them, they will indeed have a long service life, as will an...
by antiscab
Mon, 11 Aug 2008, 03:43
Forum: AEVA WA Branch
Topic: Introductions...?
Replies: 15
Views: 3641

Introductions...?

that is true.......
just dont get anything pinched between them....that really really hurts:p
lol

when your done with the prendev machine, you could have a crack at a permanent magnet motor

Matt
by antiscab
Mon, 11 Aug 2008, 00:57
Forum: AEVA WA Branch
Topic: Introductions...?
Replies: 15
Views: 3641

Introductions...?

the energy has to come from somewhere.
on the prendev website, it clearly states the motor has no electrical input.
no fuel input.
and yet makes 100kw?

this is a perpetual motion machine.
it doesnt work.

a quick googling of prendev turns up a whole bunch of people sucked in.

Matt
by antiscab
Mon, 11 Aug 2008, 00:38
Forum: General EV Discussion
Topic: Looking for some experience
Replies: 14
Views: 2233

Looking for some experience

the danger isnt from high current, its from high voltage. fuses only protect from high current. anything above 0.1A flowing through you is highly dangerous. it just so happens that skin has such a high resistance, that a high voltage is needed for 0.1A or more to flow through you. contactors and fus...
by antiscab
Sun, 10 Aug 2008, 23:43
Forum: General EV Discussion
Topic: LPG/Natural gas generator backup & more
Replies: 12
Views: 2053

LPG/Natural gas generator backup & more

If you are looking for low/easy maintenance and practicality, steer clear of flooded lead acid. Flooded lead acids have just as much of a balance issue as agm, and much worse than lithium. If you plan on balancing by overcharge, you will get a short service life, corrosion in the battery racks, corr...
by antiscab
Sun, 10 Aug 2008, 23:20
Forum: AEVA WA Branch
Topic: 2008 Perth Branch AGM
Replies: 12
Views: 2695

2008 Perth Branch AGM

where is the meeting going to be held?

Matt
by antiscab
Sun, 10 Aug 2008, 23:06
Forum: General EV Discussion
Topic: The electric car that nobody wants.
Replies: 14
Views: 2637

The electric car that nobody wants.

interesting that it only gets 20-30km range. 120v worth of T-105s should get closer to 50-60km (@60% dod). its also interesting that he quotes a warp 9 as being permanent magnet, when its a series wound motor. for some this vehicle would be acceptable. an upgrade to lithiums when the batteries die a...
by antiscab
Sun, 10 Aug 2008, 23:02
Forum: General EV Discussion
Topic: Looking for some experience
Replies: 14
Views: 2233

Looking for some experience

an EV car requires alot of energy and power to "go". you need at least 7-8kw continuous and 30-40kw peak, an 15-20kwh/100km 8kw at 24v is 334A. hence EVs need a much larger battery pack than just about anything youve ever encountered (including electric forklifts). for most applications, thundersky ...
by antiscab
Sat, 09 Aug 2008, 04:05
Forum: AEVA WA Branch
Topic: WA DPI Modification Form
Replies: 18
Views: 4748

WA DPI Modification Form

ditto, just sent mine off.

by antiscab
Thu, 07 Aug 2008, 18:04
Forum: Batteries, charging, management and monitoring
Topic: **How many amps can a battery put out?**
Replies: 9
Views: 2426

**How many amps can a battery put out?**

saturation is where the part of a magnetic field has reached an upper limit. This is a limitation of all motors, particularly AC induction motors as these require the magnetic field to be a specific shape to work efficiently. When the field starts to saturate, this field shape changes, and efficienc...
by antiscab
Thu, 07 Aug 2008, 03:38
Forum: AEVA WA Branch
Topic: Bassendean December 6-7th
Replies: 2
Views: 1182

Bassendean December 6-7th

cool, ill probably have my mr2 going by then:)
by antiscab
Wed, 06 Aug 2008, 04:02
Forum: General EV Discussion
Topic: series/parrallel switching of batteries and motors
Replies: 7
Views: 1362

series/parrallel switching of batteries and motors

ah of course, i forgot about switching losses.

hmm, yet another design decision to make.
i wonder how much 1000A worth of ripple caps is worth:p
144v to 288v switching would require 2xreversing contactor assemblies.

Matt
by antiscab
Wed, 06 Aug 2008, 03:57
Forum: General EV Discussion
Topic: EVParking in Perth
Replies: 5
Views: 942

EVParking in Perth

hmm, maybe suggest the possibility of 3-phase power? single phase is fine for smaller evs such as my moped, but for something car sized, oppurtunity charging from a single phased source is less useful. Of course the problem with 3-phase is that the total energy consumed can potentially be much great...
by antiscab
Wed, 06 Aug 2008, 03:52
Forum: Batteries, charging, management and monitoring
Topic: Charging ThunderSkys
Replies: 2
Views: 945

Charging ThunderSkys

charging for thunderskys is basically
cc at 0.3C then cv at 3.7-3.8vpc.
the when current falls to 1A (i think?) cv at 3.5-3.6vpc.

Matt
by antiscab
Wed, 06 Aug 2008, 03:39
Forum: Batteries, charging, management and monitoring
Topic: Hi Power Batteries
Replies: 53
Views: 11156

Hi Power Batteries

Welcome to the other side AMPrentice,
as a bunch were all relatively new to the EV world, so id hang around the EVDL aswell, (like alot of us do:p)

out of curiosity, whos the manufacturer of those cells?
your prices are fairly cheap, gotta love competition, the more the better.

Matt
by antiscab
Tue, 05 Aug 2008, 04:55
Forum: Batteries, charging, management and monitoring
Topic: 6Volts vs 12Volts
Replies: 8
Views: 1860

6Volts vs 12Volts

for 30km range you need a usable capacity of 5.4kwh. i would suggest having a usable capacity of 30% more than this to allow for capacity loss due to low temperature, and a general buffer. so i suggest 7kwh. to get 7kwh, you would need 144v 60AH if thundersky or any other lithium battery. If lead th...
by antiscab
Mon, 04 Aug 2008, 08:50
Forum: General EV Discussion
Topic: series/parrallel switching of batteries and motors
Replies: 7
Views: 1362

series/parrallel switching of batteries and motors

Clang ! Matt, I think you missed my point. http://forums.aeva.asn.au/smileys/smiley18.gif Motor torque is directly proportional to motor current. Put your kW thinking aside for a moment, it is clouding your logic. Your motor can't develop kW if there is a voltage or current limit. At low revs there...