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Search found 1711 matches

by woody
Thu, 21 Aug 2008, 23:26
Forum: General EV Discussion
Topic: $6000 EV
Replies: 22
Views: 3511

$6000 EV

Richo,
2nd hand cars are cheap if you go for ugly and/or boring and/or unreliable.
cheers,
Woody
PS: Use more smileys ppl. things are getting tense :-)
by woody
Thu, 21 Aug 2008, 23:20
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

Woody. The torque available below about 500RPM will be effected by the Drive power - up to a limit where extra drive power doesn't help (this is acmotor's 466%). From 500 to 1500 is moving from drive effect to mostly pullout torque of the motor. At 1500RPM and assuming normal voltage then it's the ...
by woody
Thu, 21 Aug 2008, 21:50
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

woody, You've thought of the saturation voltage in a whole new way ! I'll have to mull that one over. The issue above normal synchronous speed is that the controller / battery no longer keeps up with the V/F ratio that the motor requires. (around 8V per Hz in my case) I should be working, but inste...
by woody
Thu, 21 Aug 2008, 21:15
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

Sorry even playing around with the numbers I can't get down to 10sec. Seems to be around the 13-15 sec mark depending on other variables. Should get under 100Wh/km@50kph. Cheers Richo, for my calcs I'm assuming: 48kW max motor power (Danfoss 5042). torque of 476% of nominal available until I hit th...
by woody
Wed, 20 Aug 2008, 23:23
Forum: General EV Discussion
Topic: Going AC thanks 2 you guys!!!
Replies: 69
Views: 7745

Going AC thanks 2 you guys!!!

Going from a very quick skim of the Manual, by someone who's only ever seen Mal's Danfoss (powered off) ... http://www.kimatek.com/pdf/kmp_manual.pdf Looks like an "S10" for sale. page 32 wiring diagram indicates the DC bus is available on connections 47 + 49. Feature list (page 5): sensorless, vect...
by woody
Tue, 19 Aug 2008, 23:09
Forum: AEVA NSW Branch
Topic: 05/08/2008 - Bi-monthly association meeting
Replies: 10
Views: 1764

05/08/2008 - Bi-monthly association meeting

Hi Kearon, I think Mal was asking about Vectrix Scooter Rob...
by woody
Tue, 19 Aug 2008, 14:51
Forum: Technical and conversion discussion
Topic: weighing vehicles
Replies: 19
Views: 4361

weighing vehicles

One way is to go to the tip which normally weigh your car on the way in and the way out, and ask for a weigh, which hopefully will cost you nothing.
by woody
Sun, 17 Aug 2008, 23:17
Forum: AEVA NSW Branch
Topic: 02/09/2008 - Food and chat at Terrey Hills.
Replies: 16
Views: 2578

02/09/2008 - Food and chat at Terrey Hills.

No, no, no striker. Save the environment, get an iPhone with built-in GPS and google maps :-)
by woody
Fri, 15 Aug 2008, 00:41
Forum: General EV Discussion
Topic: Back from uk
Replies: 64
Views: 6710

Back from uk

Possibly they'll go the NZ route and charge extra on your rego based on distance travelled (see kiwiev.com).

What a great political move it would be to say they'll never charge road tax on EVs. It costs them nothing on paper, but think of the political mileage!
by woody
Fri, 15 Aug 2008, 00:34
Forum: Technical and conversion discussion
Topic: Reality check on motor/battery/donor combo please!
Replies: 13
Views: 5658

Reality check on motor/battery/donor combo please!

AFAIK Internal Combustion engines use more fuel at higher RPM because higher RPM means more air going through the system, and you need to keep the fuel/air mixture rich enough to avoid nasty problems like putting holes in pistons from burning too lean. There is also more friction due to the pistons ...
by woody
Wed, 13 Aug 2008, 06:56
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

Richo: working with 1000kg, 4.4:1, 165/75R13 = 280.6mm radius. Using 0.015 for combined tyre/steering/brake drag I get about 147N of Rolling Resistance.
by woody
Wed, 13 Aug 2008, 06:53
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

acmotor: your info is gold Locked rotor current 7.8 * nominal current 20.5 =~ 160A for 60s which will almost (but not quite) cook it. Your explanation of Breakdown torque is tops. Ye olde danfoss 5042 can put out a max of 97.6 Amps in high overload torque mode, so that looks like the limit here: 97....
by woody
Wed, 13 Aug 2008, 06:09
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

Hi Richo, I'm hoping for more Lotus Cortina than 1200cc Cortina Performance, but somewhere in the middle would be fine. Top Speed original 125kph is fine. 0-100 Lotus 10secs would be great, original 26 secs would be disappointing Efficiency: hoping to get under 100Wh/km @ 50kph, but I really don't m...
by woody
Wed, 13 Aug 2008, 05:34
Forum: General EV Discussion
Topic: The electric car that nobody wants.
Replies: 14
Views: 2397

The electric car that nobody wants.

Re: Saab Gearbox

I'd forgotten about that weird configuration: Longitudinal Engine in a front wheel drive.

If you're going to chain or belt drive it, that would be an easy place to alter the overall ratio by fitting different sized cogs/wheels.

cheers,
Woody
by woody
Mon, 11 Aug 2008, 21:53
Forum: Technical and conversion discussion
Topic: Reality check on motor/battery/donor combo please!
Replies: 13
Views: 5658

Reality check on motor/battery/donor combo please!

A sydney guy has converted a holden combo. It's a lot heavier (lead-acid) but he's regretting the 8 inch ADC and would have preferred the 9 inch because he's thrashing the 8 inch which is inefficient and heats it up, making it worse. The downsides of bigger DC motor off the top of my head: 1) bigger...
by woody
Mon, 11 Aug 2008, 21:44
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

Hmm, in the CMG specs (looking at 4 pole 11kW 132MB-38), I have "Full Load T[N]" of 72.7 Nm "Locked Rotor (T[L] / T[N])" of 1.9 and the scary sounding "Break down (T / T[N])" of 3.0. I also have: "Current Full load I[N]" of 20.5 A @ 415V. "Locked Rotor (I[L] / I[N])" of 7.8. Which so I'm guessing me...
by woody
Mon, 11 Aug 2008, 20:13
Forum: General EV Discussion
Topic: Industrial AC Controllers + Rated Torque/Power
Replies: 135
Views: 16658

Industrial AC Controllers + Rated Torque/Power

Hi, I'm trying to predict the torque/power one might get using a particular controller with a particular motor. Motor Specs are available like: Poles / Rated Hz / RPM / Torque / Volts / Full Load Current / No Load Current / Torque Overload Factor / Efficiency / Power Factor Controller / VFD / Invert...
by woody
Mon, 11 Aug 2008, 19:58
Forum: Technical and conversion discussion
Topic: One EV converters story cont.
Replies: 1
Views: 741

One EV converters story cont.

Well the Zivan / Trojan / Curtis / ADC route is certainly well tested! This guy converted in 1995/6 and used all of the above in his Mazda 626 :-) Good detail in the blog. (predates the "blog" term even!) I read to the end and he started another conversion in 2002 (Ford Probe), but I haven't read to...
by woody
Mon, 11 Aug 2008, 19:54
Forum: Batteries, charging, management and monitoring
Topic: Seidenbattery
Replies: 4
Views: 1089

Seidenbattery

The salesman said they had a couple of private sales to Australia, no distributor. I stopped digging when I realised that I couldn't get away with 10Ah LFPs and that TS was bringing our LFP20AHAs. I found the salesman on the thundersky yahoogroup.
by woody
Sun, 10 Aug 2008, 23:11
Forum: General EV Discussion
Topic: Heresy ("musings on efficiency")
Replies: 8
Views: 1023

Heresy ("musings on efficiency")

Hmm, I'll be doing my sums on keeping the gearbox too. Thanks to you experienced EVers for your invaluable thoughts :-)
by woody
Sat, 09 Aug 2008, 04:23
Forum: General EV Discussion
Topic: Heresy ("musings on efficiency")
Replies: 8
Views: 1023

Heresy ("musings on efficiency")

I'm technical. Energy efficiency seems like the right way to do things. But I think I'm getting hung up on it. The first crack in my ivory tower was a quote I saw (attributed to the WA Mustang EV guy) which I'll misquote here: "Forget regen, save your money and spend some of it on extra batteries to...
by woody
Sat, 09 Aug 2008, 04:01
Forum: General EV Discussion
Topic: electric coversion for grey army,
Replies: 9
Views: 1130

electric coversion for grey army,

My little Cortina should lose 2.5kW to drag at 40kph, so I could drive almost that fast all day on a genny, allowing for charging losses. It loses 5kW to drag at 60kph, so I could drive for 12 hours at 60kph if I ran the genny 24/7 and had some batteries. Your camper will lose more to drag than that...
by woody
Sat, 09 Aug 2008, 00:35
Forum: General EV Discussion
Topic: Regen for DC?
Replies: 62
Views: 5230

Regen for DC?

Ok think of it this way, the flywheel is permanently connected to the generator input shaft, so if the flywheel rotates the input shaft on the generator turns at the exact same speed; consider it welded to it if that helps. OK. Point 1: your car + flywheel need more energy to speed up than just the...
by woody
Fri, 08 Aug 2008, 21:48
Forum: General EV Discussion
Topic: LPG/Natural gas generator backup & more
Replies: 12
Views: 1738

LPG/Natural gas generator backup & more

Edited for new Greensaver price of AU$60 ea. I should add that the Greensavers work out almost cheaper per Wh lifetime than thunderskies: Greensaver: 800 cycles @ 50% DoD * 12V * 20 Ah = 95kWh lifetime $60/95kWh = 63c/kWh Thundersky: 1500 cycles @ 70% DoD * 3.2V * 40 Ah = 134.4kWh lifetime $64/134.4...
by woody
Fri, 08 Aug 2008, 21:34
Forum: General EV Discussion
Topic: LPG/Natural gas generator backup & more
Replies: 12
Views: 1738

LPG/Natural gas generator backup & more

I don't think there's an Australian distributor, a4x4kiwi is importing directly (ordered last week). I think it worked out to somewhere between AU$1500 and AU$2000 for the lot including all taxes, shipping and port charges.