Search found 100 matches

by gmacd33
Thu, 18 Aug 2011, 15:32
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 3925

Alternative to Headway cells

That's interesting that the 3-cell holders crack - under what conditions? From cold, or severe loading, or something else?

Does anyone know if the 2-cell holders are any better?

I'm getting a sample of both the 2-cell and 3-cell holders sent to me within a week or so - will see how they hold up...
by gmacd33
Wed, 17 Aug 2011, 22:35
Forum: Technical and conversion discussion
Topic: gearboxes
Replies: 23
Views: 2535

gearboxes

I'm not sure that gearboxes are not recommended for EVs - in my opinion they certainly are recommended. Also, in my conversion I found it easier to keep the existing gearbox, rather than get rid of it. What would be ideal for EVs would be 2- and 3-stage gearboxes - these are being made by BorgWarner...
by gmacd33
Mon, 15 Aug 2011, 15:03
Forum: Technical and conversion discussion
Topic: Reverse Cycle Air Conditioning
Replies: 4
Views: 2855

Reverse Cycle Air Conditioning

I'm planning on doing this for a couple of the vehicles that I'm working on. I haven't done it yet, but the advice I have received is as follows: "Many cars have a TX or thermal expansion valve - does not work with reverse cycle, need to replace with orifice valve." On another note, the NCOP14 requi...
by gmacd33
Mon, 15 Aug 2011, 14:51
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 3925

Alternative to Headway cells

Lithbattboss's endcaps do fit - I have tested them with Lifetech and Headway cells, which are both the same size.

You can also get 2-cell and 3-cell holders from Manzanita Micro:
http://manzanitamicro.com/products?page ... gory_id=29
by gmacd33
Sun, 14 Aug 2011, 21:55
Forum: AEVA QLD Branch
Topic: August Meeting
Replies: 1
Views: 898

August Meeting

Hi all, Don is away this month so I'll be taking the meeting on Wednesday, same time same place: 7:30pm Albion Peace Centre McDonald Rd, Albion Wednesday 17 Aug Our agenda will include the following * EV Festival Progress update * Member build reports (including a post-mortem of my fried controller ...
by gmacd33
Fri, 12 Aug 2011, 19:44
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 3925

Alternative to Headway cells

Headway supplier is as follows, at $1.30/Ah for 450 of 10Ah cells: Jason Hipower New Energy Group Co.,Ltd. ADD: HiPower Industrial Park, NO.1 Tianan Rd, Hi-Tech Development District, Zaozhuang, Shandong, China Skype: jasonlujun MSN: lllf.nc.jun@163.com Email: hipowergroup.jason@gmail.com TEL: 86(0)7...
by gmacd33
Thu, 11 Aug 2011, 14:27
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 3925

Alternative to Headway cells

Headway are $2.50/Ah (10Ah cell) excluding shipping anywhere I've seen them. If you have a source that will sell them cheaper than the price of (only ~2C capable) Thundersky you are extremely lucky. Most people aren't that lucky. Thundersky are $1.30/Ah for full size pack from EV Works: http://evwo...
by gmacd33
Wed, 10 Aug 2011, 21:33
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 3925

Alternative to Headway cells

That's $1.75/Ah, which seems fairly expensive. I have a contact who can get Headways for $1.30/Ah, but for a pack of 14kWh. I'd be dubious about relying on datasheets - Thundersky (Winston) datasheets quote 20C max current, and we all know that's bogus for anything useful. How far do you plan to dri...
by gmacd33
Tue, 19 Jul 2011, 14:16
Forum: Batteries, charging, management and monitoring
Topic: What paste?
Replies: 12
Views: 2535

What paste?

Yeah that Jaycar product from ChemTools makes it very difficult to tighten up the connection, because of the lubricating property.

I had to get the supplier to specifically order some of the Cabac product, as they didn't have anything in stock.
by gmacd33
Mon, 18 Jul 2011, 17:52
Forum: Batteries, charging, management and monitoring
Topic: What paste?
Replies: 12
Views: 2535

What paste?

CABAC makes one, part number EJCG125. I got Haymans to order some for me, as they didn't have Uni-seal (perhaps just the Virginia branch...)
by gmacd33
Wed, 06 Jul 2011, 22:49
Forum: Batteries, charging, management and monitoring
Topic: "Winter effect" or dying cell?
Replies: 17
Views: 2001

"Winter effect" or dying cell?

Hey I've got a few Headway 10Ah cells on my desk at work here for testing - been pulling 7C out of them with no troubles, only sagging to 2.9V. This is much better than the Sky Energy cells I have in my personal car. How have you found Headway in relation to Thundersky (which I consider equal qualit...
by gmacd33
Fri, 10 Jun 2011, 15:33
Forum: Batteries, charging, management and monitoring
Topic: Charging a 450V battery pack
Replies: 16
Views: 2590

Charging a 450V battery pack

As a point of interest, Gmac, what brand are the DC-DC converters? Is the output voltage adjustable? Do they current limit on overload or just shut down? Those DC-DC converters are MeanWell brand. Current limiting on overload. I believe output voltage is adjustable. There is another one that was cu...
by gmacd33
Thu, 09 Jun 2011, 17:31
Forum: Batteries, charging, management and monitoring
Topic: Charging a 450V battery pack
Replies: 16
Views: 2590

Charging a 450V battery pack

For DC-DC converters, I have a contact that supplies ones with input voltage of 254-780VDC, for around $200. They only supply 10A continuous at 12V, so maybe a couple in parallel. Some say connecting DC-DC converters in parallel would require Auctioneering diodes?!? Anybody know more about this?
by gmacd33
Thu, 09 Jun 2011, 17:22
Forum: Batteries, charging, management and monitoring
Topic: Charging a 450V battery pack
Replies: 16
Views: 2590

Charging a 450V battery pack

For a charger, Brusa is the best IMHO but also very expensive. You can get them from metricmind.com - the NLG513-SX is US$4,396 (price just went up). Apparently LiFeTech is also bringing out a charger shortly - don't have details myself. The Manzanita Micro PFC20 charger specs a peak voltage of 450V...
by gmacd33
Tue, 24 May 2011, 21:54
Forum: Electric motors and controllers
Topic: liftmotor controller from china
Replies: 4
Views: 1076

liftmotor controller from china

Hi Hansje You can work out what is possible with this, but you need some specific info: - Vehicle mass - gear ratios (gearbox and differential) - wheel diameter - gradient of hill If you use the power rating of 7.9kW you can work out the torque at different rpm values, and work out the above. Else s...
by gmacd33
Sun, 22 May 2011, 18:33
Forum: Electric motors and controllers
Topic: liftmotor controller from china
Replies: 4
Views: 1076

liftmotor controller from china

Far to small for anything more than driving round the car park. If you run it at 7.9kW for more than 15% duty, such as driving at 50kph, it will overheat pretty quickly. Not to mention hills. And if you run 650A 36V that is 3x its max power - it will overheat even more quickly. Sorry mate.
by gmacd33
Thu, 05 May 2011, 01:36
Forum: General EV Discussion
Topic: Blade EV - New model
Replies: 104
Views: 13238

Blade EV - New model

You know what, ANYONE that pays $300,000 dollars for a car is a tosser. Regardless of who or what they are or do. $300,000 are you effing joking, absolutely disgusting! As a farmer who battles daily to make a living, to listen to someone big note themselves over a $300,000 car makes me sick! What e...
by gmacd33
Fri, 29 Apr 2011, 21:18
Forum: General EV Discussion
Topic: List of conversion workshops in Australia
Replies: 52
Views: 23939

List of conversion workshops in Australia

I should probably update this - I'm not offering conversions now as I'm focusing on building high performance supercars. I can help with advice, but can only sell you a high performance (read high price) new car.

Greg
by gmacd33
Tue, 26 Apr 2011, 19:59
Forum: Technical and conversion discussion
Topic: Pre Charge Resistor
Replies: 30
Views: 4704

Pre Charge Resistor

The capacitance is in the user manual, on the top of page 20. Perhaps you were looking at the datasheet?
by gmacd33
Wed, 06 Apr 2011, 00:23
Forum: Electric motors and controllers
Topic: Motor choices
Replies: 11
Views: 2499

Motor choices

A DC motor usually has "advanced timing" which means it prefers to run in one direction rather than the other. However it can run at low power for short periods in the other direction - ie for reversing a car. Unless it has interpoles - then it's fine for either direction. Be aware that simply swapp...
by gmacd33
Tue, 29 Mar 2011, 20:28
Forum: AEVA QLD Branch
Topic: Tesla in Brisbane tomorrow!
Replies: 0
Views: 1003

Tesla in Brisbane tomorrow!

Tesla Roadster will be in Brisbane tomorrow - see details below from Alina Dini, who spoke at our last meeting: http://forums.aeva.asn.au/uploads/1225/Tesla_in_Australia.jpg As you may be aware, the high performing electric sports car – the Tesla Roadster – is making a 3000 km journey up the Austral...
by gmacd33
Fri, 25 Mar 2011, 21:36
Forum: Technical and conversion discussion
Topic: VW Type 1 conversion... maybe
Replies: 30
Views: 5005

VW Type 1 conversion... maybe

Batteries. It's not quite true that high current capacity batteries are much more expensive. I realise that - I'm referring to the storage capacity, not the current. Ie specific energy, not specific power. To use the example of your 12kWh pack that weighs 150kg - 12kWh in LiFeTech LFP cells would w...
by gmacd33
Fri, 25 Mar 2011, 19:30
Forum: Technical and conversion discussion
Topic: VW Type 1 conversion... maybe
Replies: 30
Views: 5005

VW Type 1 conversion... maybe

If you've got the $$, AC is much better for weight. For example you can get 150kW of motor and controller for 45kg. (But that would cost your entire $20k budget - perhaps a 75kW system would be suitable.) AC is also inherently more efficient, and allows regen which makes it even more efficient - thi...
by gmacd33
Thu, 24 Mar 2011, 22:11
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 8636

AC-50 or BLDC for Calibra conversion?

Welcome! My 2 cents: Go with the larger motor, at least 80kW peak. Your current ICE is 110kW. If you want equivalent performance on the motorway, you need equivalent power. Lots of low-end torque is great for acceleration from standstill, but at speeds it's all about power. Higher voltage is better ...