Search found 13 matches

by scotto
Thu, 07 Jul 2011, 23:11
Forum: Batteries, charging, management and monitoring
Topic: "Winter effect" or dying cell?
Replies: 17
Views: 2348

"Winter effect" or dying cell?

My suspicion is dirty contacts, since you don't mention the adverse effects of the cold cells wearing off as they warm up with load. I'd expect the cells to warm up and behave more or less normally after 10-30 minutes (totally wild guess) of actual use. At lunch I took it for another spin to see if...
by scotto
Thu, 07 Jul 2011, 17:24
Forum: Batteries, charging, management and monitoring
Topic: "Winter effect" or dying cell?
Replies: 17
Views: 2348

"Winter effect" or dying cell?

I'd say its the cold, I used to have it on my old Emax. Yeah I think this might be it. I decided to test the theory this morning by braving the cold to ride to work: According to BOM it was about 8.5 degrees around the time I was riding. Under full load I saw the voltage drop to 44.8V (!) which was...
by scotto
Tue, 05 Jul 2011, 18:13
Forum: Batteries, charging, management and monitoring
Topic: "Winter effect" or dying cell?
Replies: 17
Views: 2348

"Winter effect" or dying cell?

Hi all. I'm observing very lackluster performance from my LiFePO4 cells lately, and cannot determine if this is to be expected due to cooler winter weather, or if in fact I have a problem with a failing cell? Specifically, I have 16 x TS 40Ah cells in my 2006 e-max sport scooter. Maximum current dra...
by scotto
Wed, 13 Apr 2011, 19:58
Forum: Electric motors and controllers
Topic: A nice BLDC motor
Replies: 2
Views: 2925

A nice BLDC motor

I contacted the company and got a bunch of information back on the EMRAX motor. Single price for the 30kW continuous / 50kW peak air cooled motor (2000/3000 RPM at 200/300V DC) = 2,990 Euro + 400 Euro shipping to oz in single unit quantities (down to 2,190 euro in 11+ bulk). Water cooled model is 10...
by scotto
Wed, 30 Mar 2011, 23:32
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

Scotto, It may be worth having a look at my car as a baseline. Thanks for the mention Richo. I understand you are in Perth. If you can make it down to MR I would be happy to show you and discuss BLDC details. Thanks Rod. My in-laws actually live down that way (Marybrook) so I'll give you a call nex...
by scotto
Tue, 29 Mar 2011, 04:49
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

Speed holding at 100kpn and a 5% grade, typical on a highway would need an additional 20kw to lift the car at 1.35m/sec. (1500kg laden mass) So total of 35kw. 14kw seems to be right on the money. OK so 34-35kW is required to be drivable up hills at 100kph (probably not for more than 2 mins at a tim...
by scotto
Mon, 28 Mar 2011, 18:14
Forum: General EV Discussion
Topic: 10KW BLDC FROM GOLDEN MOTOR Model HPM-10kw
Replies: 14
Views: 16265

10KW BLDC FROM GOLDEN MOTOR Model HPM-10kw

OK so I got a reply from Golden Motor regarding prices:
It is possible to connect two motors in series.

The price for samples is USD535 each.

The price for bulk order (MOQ 100 pcs) is USD390 each
So two of these in series for 20kw continuous/40kW peak seems like a pretty good deal!

by scotto
Mon, 28 Mar 2011, 17:56
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

90 x 100 AH (Thundersky) are heavy ~ 300 kg, do the battery will have to be distributed to balance the vehicle. Possibly some can go under the floor in the space vacated by the exhaust and fuel tank. Yes I'm a little concerned about the weight too. The max specified weight for the car stamped on th...
by scotto
Sat, 26 Mar 2011, 00:49
Forum: General EV Discussion
Topic: 10KW BLDC FROM GOLDEN MOTOR Model HPM-10kw
Replies: 14
Views: 16265

10KW BLDC FROM GOLDEN MOTOR Model HPM-10kw

Price from $386 7.5kw to $500 for 10kw
I think that price is for the controller - I can't seem to find prices on the motor itself?

Still, 2 x controllers @ $500 each + 2 x 10kW motors would make a pretty nice 20kW dual-motor setup with peak up to 40kW if needed!
by scotto
Fri, 25 Mar 2011, 21:31
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

288v isn't that bad to deal with, but it does mean the battery boxes need to be better sealed, and more spacing is necessary between high potential areas. Yeah I've been leaning towards a higher voltage setup for efficiency reasons and to be more gentle on the batteries. I'm starting to wonder if t...
by scotto
Thu, 24 Mar 2011, 23:30
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

Yes I've been thinking the larger motor might be the way to go, although I'm a little put off by the weight (88kgs + controller). Given the car has a sporty profile (if a little 1990s looking) it would be nice to be able to "demonstrate" the performance possibilities of an EV for non-EV believers ht...
by scotto
Thu, 24 Mar 2011, 21:41
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

Hi Richo thanks for the welcome! Yeah I met Rod when I purchased some cells and BMS for my 2006 e-max which I've now converted to lithium. He was the one who suggested I look at AC motors in the first place. I didn't realise until reading that link again that he was running a BLDC motor though! Rod ...
by scotto
Thu, 24 Mar 2011, 19:38
Forum: Technical and conversion discussion
Topic: AC-50 or BLDC for Calibra conversion?
Replies: 39
Views: 9235

AC-50 or BLDC for Calibra conversion?

Hi all. I'm in the process of acquiring a 1992 Holden Calibra for an EV conversion. I want to be able to use it as a daily driver with ability to handle occasional freeway/highway speeds (~120kph) with reasonable acceleration (not worse than factory) and range (100km would be nice). I think this veh...