Search found 33 matches

by priit
Tue, 26 Mar 2019, 13:15
Forum: Charging Infrastructure
Topic: Simple type 2 outlet for home charging
Replies: 5
Views: 1350

Re: Simple type 2 outlet for home charging

I have been looking into the charging at home garage options as I am planning to purchase an EV before the end of this year and am not sure if I would need to go with a dedicated charger instead of a simple type 2 outlet. I have 2 different rates for my electricity In Queensland (Energex rates NTC70...
by priit
Thu, 13 Aug 2009, 21:05
Forum: Technical and conversion discussion
Topic: how much power
Replies: 13
Views: 1786

how much power

If the car is Repairable Writeoff, you can repair it and have it registered again, if it is Statutory Writeoff, you can only use it for parts, but can not register it again.
by priit
Mon, 11 May 2009, 22:44
Forum: General EV Discussion
Topic: Project Better Place No3 is Australia!
Replies: 48
Views: 6903

Project Better Place No3 is Australia!

I would like to add to the discussion that the swappable batteries may actually be slightly outdated by the time they get implemented. I believe by that time new and better ultra capacitors have been tested and could be in production. This would allow using large enough capacitor banks in the car. R...
by priit
Wed, 27 Aug 2008, 02:49
Forum: General EV Discussion
Topic: Going AC thanks 2 you guys!!!
Replies: 69
Views: 6492

Going AC thanks 2 you guys!!!

Weather 300kg of batteries is much or not so much depends on the car. When you look at the Audi conversion project, the engine with the gearbox was 350kg so 300kg for batteries to put in there will not be a problem.

http://www.metricmind.com/audi/7-engine.htm
by priit
Fri, 15 Aug 2008, 15:58
Forum: General EV Discussion
Topic: Corolla wagon 4WD conversion
Replies: 22
Views: 2039

Corolla wagon 4WD conversion

140kg is about what the ac55 weighs isnt it? i cant remember. i suggested 2x warp 9 from an efficiency point of view, smaller motors wont be as efficient, though might get the job done. maybe 2 x impulse 9s at 110kg might be better. AC55 is 106kg, so would be lighter then either of the 2 motor conf...
by priit
Thu, 14 Aug 2008, 23:03
Forum: General EV Discussion
Topic: Corolla wagon 4WD conversion
Replies: 22
Views: 2039

Corolla wagon 4WD conversion

For acceleration in range od 12-15 sec 0-100kmh you could use AC55 motor with DMOC445 controller. Depending on the gearbox or the drive ratio you will be able to get max speed probably around 140-160kmh (thats where the KW power from the moter at high rpm will fall below the power needed to move the...
by priit
Fri, 01 Aug 2008, 03:54
Forum: General EV Discussion
Topic: Mixing Motors?
Replies: 31
Views: 3627

Mixing Motors?

From what I understand about using multiple motors, it makes the system a bit more complicated if you have different motors. With AC motors it will be complicated anyways so if you can manage with one bigger AC motor, then probably worth going that way. With DC motors, if they are identical you can ...
by priit
Mon, 28 Jul 2008, 19:52
Forum: General EV Discussion
Topic: Gearbox Vs Motor Peak Efficiency
Replies: 15
Views: 1169

Gearbox Vs Motor Peak Efficiency

The power graphs for ICE-s can be better however there are not many ICE-s that give you the torque curve of an electric motor. the AC-150 for instance gives you constant torque of 220Nm from 0-5000rpm. This is the difference with ICE-s. This is also the reason why people often go for direct drive. T...
by priit
Mon, 28 Jul 2008, 18:00
Forum: General EV Discussion
Topic: Gearbox Vs Motor Peak Efficiency
Replies: 15
Views: 1169

Gearbox Vs Motor Peak Efficiency

I would say that Tesla pretty much proves that both good acceleration and good top speed is possible if you have the finances. There are differences in ICE cars and Electric that is for sure. A big part is played by the economies of scale. Since Electric cars are not mass produced the good component...
by priit
Sat, 26 Jul 2008, 01:48
Forum: General EV Discussion
Topic: Gearbox Vs Motor Peak Efficiency
Replies: 15
Views: 1169

Gearbox Vs Motor Peak Efficiency

I did a little checking and the gearbox ratios and the axle ratios I gave are used on cars with engines 3 liter and more mostly and the gearbox ratios and axle ratios you put down are mostly used for smaller engine cars. However you are right that there will be a limit between the acceleration and t...
by priit
Fri, 25 Jul 2008, 21:19
Forum: General EV Discussion
Topic: Gearbox Vs Motor Peak Efficiency
Replies: 15
Views: 1169

Gearbox Vs Motor Peak Efficiency

That thing goes in the place of your regurlar gearbox. It just changes the ratio. From what I understand it is approximately 4 to 1 ratio so 4 rev from the motor come in and 1 rev goes out to the axle of your car. in your axle you get usually from 2.5 to 3.5 ratio differential which you multiply by ...
by priit
Fri, 25 Jul 2008, 01:32
Forum: General EV Discussion
Topic: Gearbox Vs Motor Peak Efficiency
Replies: 15
Views: 1169

Gearbox Vs Motor Peak Efficiency

I believe the single speed transmission can be called many names like Azure Dynamics calls theirs gearbox with internal differential and others may call them differently. The one that can be bought with Azure Dynamics motors is visible on this datasheet: http://www.azuredynamics.com/products/force-d...
by priit
Fri, 25 Jul 2008, 00:42
Forum: General EV Discussion
Topic: Gearbox Vs Motor Peak Efficiency
Replies: 15
Views: 1169

Gearbox Vs Motor Peak Efficiency

The Tesla for example has a 2 speed transmission. When you read up on Tesla, they dumped their 2 speed transmission and went with the 1 speed transmission. I believe they had problems that the 2 speed transmission was not durable enough and the high torque of electric motor damaged the transmission...
by priit
Thu, 17 Jul 2008, 01:54
Forum: General EV Discussion
Topic: Auto trans?
Replies: 14
Views: 1154

Auto trans?

The question will not be the battery space, but the battery weight. Batteries are heavy if you want good range.
by priit
Thu, 17 Jul 2008, 00:23
Forum: General EV Discussion
Topic: Auto trans?
Replies: 14
Views: 1154

Auto trans?

Using an auto transmition I would recommend checking if it can actually take that much torque, since electric motor has huge torque that the auto tramsmitoins are not made for especially from standing, so the torque could kill the transmition fast. You might actually be better off using direct drive...
by priit
Wed, 16 Jul 2008, 03:26
Forum: General EV Discussion
Topic: Overall Initial Calculations
Replies: 20
Views: 2019

Overall Initial Calculations

Just a little thing to point out is that if you consider the batteries into the EV running cost, then you need to consider the multiple oil changes and engine maintenances into the petrol car running costs also, not just the fuel. Over 200k km those amount up to a sizeable sum and you will not be ha...
by priit
Sat, 12 Jul 2008, 01:17
Forum: General EV Discussion
Topic: A noob question about range.
Replies: 6
Views: 724

A noob question about range.

The performance with the batteries full or emty depends on many factors. It is affected by the batteries used and the controller used. When full, the battery voltage is higher. So when accelerated the battery voltage will go down during the draw of big amps. So if the battery can take it, you can pu...
by priit
Fri, 11 Jul 2008, 23:06
Forum: General EV Discussion
Topic: A noob question about range.
Replies: 6
Views: 724

A noob question about range.

There are some things about EV-s that you need to know when thinking about the range. 1. You will not want to drive your batteries to 0% so you should at least leave 20% in the batteries for them to live for a reasonable usable time. 2. Most of the controllers I have looked at have an option to set ...
by priit
Tue, 08 Jul 2008, 11:00
Forum: General EV Discussion
Topic: 55kW AC Motor & LiFePo4 Batteries
Replies: 17
Views: 4111

55kW AC Motor & LiFePo4 Batteries

I will let you know if I get an answer from them. Priit OK got the answer from Azure Dynamics: -------------------------------------------------------------------------------- From: Beth Silverman [mailto:bsilverman@azuredynamics.com] Sent: Mon 7/7/2008 11:50 PM To: Priit Vosu Subject: RE: AC55 wit...
by priit
Sat, 05 Jul 2008, 23:17
Forum: General EV Discussion
Topic: ac motor info
Replies: 16
Views: 1541

ac motor info

It is interesting that many (most) people start an EV project by looking at the motor. This is one place to start. Others start looking at the battery. This was the case with the Tesla. With conversions it is often best to look at motor first though. (responses anyone ?) I believe that is individua...
by priit
Sat, 05 Jul 2008, 04:01
Forum: General EV Discussion
Topic: Direct drive points.
Replies: 13
Views: 1265

Direct drive points.

In the end, I want a small car (must be a Ford), and I want it to be quick. I would be chasing a 0-100 (kilometres) time in the vicinity of 5-6 seconds. I think an AWD Laser may be the way for me, unless I can find a motor powerful enough to propel a front wheel drive laser (or a Capri) to 100 kph ...
by priit
Fri, 04 Jul 2008, 21:42
Forum: General EV Discussion
Topic: 55kW AC Motor & LiFePo4 Batteries
Replies: 17
Views: 4111

55kW AC Motor & LiFePo4 Batteries

I do have a question though. When you look at those ProductSheets, the one with the DMOC445 has the graphs drawn when using 400A peak power and the one with DMOC645 has graps drawn with 600A power. hence I deducted that even though the controller is 250A for first and 414A for the second one they bo...
by priit
Fri, 04 Jul 2008, 13:34
Forum: General EV Discussion
Topic: 55kW AC Motor & LiFePo4 Batteries
Replies: 17
Views: 4111

55kW AC Motor & LiFePo4 Batteries

as far as acceleration, it depends how much of a voltage drop the controller can accept as to how much pwoer you can get from the batteries. for instance, if the min battery voltage is 280v, then you couldnt pull more than 2C from the batteries, which is 180A@280v= 50kw. if min volage is 260v then ...
by priit
Fri, 04 Jul 2008, 00:38
Forum: General EV Discussion
Topic: 55kW AC Motor & LiFePo4 Batteries
Replies: 17
Views: 4111

55kW AC Motor & LiFePo4 Batteries

Ok, a few comments here: 3: Heater. You will need one for the defogging of windows when it is raining. So not geting out of it really. 5: Gearbox. Just to let you know that 2000rpm is not the limit where you will be driving the car. AC55 motor will be powerful enough to push your car much further. T...
by priit
Thu, 03 Jul 2008, 06:05
Forum: General EV Discussion
Topic: 55kW AC Motor & LiFePo4 Batteries
Replies: 17
Views: 4111

55kW AC Motor & LiFePo4 Batteries

Are you going for a direct drive solution or will you leave the gearbox still in the car? If direct, what will be the final drive ratio? If leave the gearbox in, will you force it to a certain gear or leave it fully functional? Have you calculated what the range will be with that pack? What kind of ...