Search found 25 matches

by Alex_Brooy
Wed, 03 Aug 2011, 11:42
Forum: Batteries, charging, management and monitoring
Topic: LFP users, who can measure cell's capacity?
Replies: 7
Views: 1310

LFP users, who can measure cell's capacity?

Yes, of course. I charged to 4.1v. But I didn't check the capacity after buy.
Terry, can you provide the link to professor's video?
by Alex_Brooy
Wed, 03 Aug 2011, 07:35
Forum: Batteries, charging, management and monitoring
Topic: LFP users, who can measure cell's capacity?
Replies: 7
Views: 1310

LFP users, who can measure cell's capacity?

I have max. peak discharge currents not more than 150A. Cruising currents are 30-50A. I actually passed 25.000km, that means 300 full cycles. But actually I don't fully discharge the pack. Hope that only my mistake with a few very deep cycles has caused such a loss. Any way, I would appreciate if an...
by Alex_Brooy
Mon, 01 Aug 2011, 22:04
Forum: Batteries, charging, management and monitoring
Topic: LFP users, who can measure cell's capacity?
Replies: 7
Views: 1310

LFP users, who can measure cell's capacity?

Hello guys, I have passed about 25.000 km (Max:70-80km per cycle) on Thunder-Sky TS-LFP90AHA cells. I installed them in May,2009. Today I measured the capacity of my 90Ah. Now I have only 83% of 90Ah ( about 75 Ah). They had been discharged till 1.7-2.0 V, about three times from the moment I started...
by Alex_Brooy
Fri, 29 Apr 2011, 22:59
Forum: Technical and conversion discussion
Topic: RX7 Series 8 EV conversion. Where do I start?
Replies: 5
Views: 1305

RX7 Series 8 EV conversion. Where do I start?

... Import an RX7 from Japan. Series 6 to 8. This will be the easy part. Buy Electric Motor, Controller, Batteries etc. I need to do more research but it will need to be fast. Piece the puzzle together in my workshop. That will be fun. ... hi, Astro. If you have electrical background, I think you c...
by Alex_Brooy
Thu, 28 Apr 2011, 01:31
Forum: Technical and conversion discussion
Topic: synthetic transmission oil-educate me!
Replies: 22
Views: 5340

synthetic transmission oil-educate me!

may be offtopic, but
Peter, how much km did you covered on your TS-LFP batteries?
by Alex_Brooy
Wed, 27 Apr 2011, 23:43
Forum: Technical and conversion discussion
Topic: Conversion manuals
Replies: 4
Views: 1204

Conversion manuals

you may also look through my site, electricmobile.ru. I made photo set how to connect plate to electric motor. Also there is an article how to choose batteries' capacity. You may freely ask me through email.
by Alex_Brooy
Sat, 26 Mar 2011, 03:52
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

One more thing, IMHO: Kelly contrlr has to control Field current during accelerating separately from Armature. This makes series motor not exactly series, but rather sepex. It seems that such design increases the amount of transistors twice vs ordinary series contoller.
by Alex_Brooy
Sat, 26 Mar 2011, 03:44
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

I've read the manual, http://kellycontroller.com/mot/download ... Manual.pdf
but didn't find info about speed control. I think it is necessary feature if they use brake pedal resistor. Otherwise user may waste energy while pressing brake pedal at zero speed. But may be I missed smth.
by Alex_Brooy
Mon, 03 Jan 2011, 05:01
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

Don't worry, us Australian's import everything from everywhere http://forums.aeva.asn.au/smileys/smiley1.gif are you planning on building and selling this product? Matt Yes Matt, I hope to find EV owners to buy about 50 devices till first half of 2011. Such a quantity can help me to set the price i...
by Alex_Brooy
Mon, 03 Jan 2011, 04:01
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

...It seems to me that compound wound motors (but with the shunt part of the field available on separate terminals) might be more suitable for this. I see that Kostov make some compound wound motors, but they only go to about 10 kW, and the shunt field connections are not available on separate term...
by Alex_Brooy
Mon, 03 Jan 2011, 03:24
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

50 amp going into a pack from 72 volt system is a nonsense. reliable Idiot proof REGEN is not available for EV with gearbox even with a clutch.How many of you are sitting on a Regen system still trying to work out why you didn't go series. If Regen was simple to use just like a normal car then i wi...
by Alex_Brooy
Sun, 02 Jan 2011, 10:53
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

...From my experience and reading 144 volt 11 kw motor was charging back at 60 Km/h Regen 14 -8-4-0 amp the time was short to stop 20 seconds adjusted to low braking Regen. The setting of Regen is unpredictable ... a few words about my ev, and particular regen mode: weight 820 kg speed 60km/h downh...
by Alex_Brooy
Sat, 01 Jan 2011, 00:57
Forum: General EV Discussion
Topic: DC Regen from practical and personal experience.
Replies: 37
Views: 7237

DC Regen from practical and personal experience.

Hello, guys. I just have finished the largest part of my regen braking experiments on series winded dc motor. I left 5-speed gearbox on my ev without change. But the clutch is removed. I rarely shift gears when running. I use 4-th gear most of the time. I use regen when decelerating from 50-60km/h. ...
by Alex_Brooy
Fri, 17 Dec 2010, 12:50
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3592

Regen breaking on series wound dc motor

Well, I checked about interpoles. My colleagues and I discussed this a secret mechanism called interpoles. One of the most experienced electricians said that to counteract the armature reaction, there exist such methods: 1. Compensating winding 2. additional poles 3. increase the air gap between the...
by Alex_Brooy
Mon, 13 Dec 2010, 01:39
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3592

Regen breaking on series wound dc motor

Once again, this is experimental isntallation:
Image

I've got 53A, 100V regen power. -6A is zero point of amp clamp meter, so -59-(-6) = 53A
Image
by Alex_Brooy
Mon, 13 Dec 2010, 01:12
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3592

Regen breaking on series wound dc motor

The first schematic is not exact realization, it is only to show the principle of work. Everything is fine with saturation&etc. One man helped me to make the device, he is professional power electronics developer. My experimental "recuperator" had been working for about 45 minutes without any damage...
by Alex_Brooy
Sun, 12 Dec 2010, 04:58
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3592

Regen breaking on series wound dc motor

This image shows my current wiring.
Image

That's what I think to make to avoid the subtraction between field exciting and regenarative currents
Image
by Alex_Brooy
Sun, 12 Dec 2010, 04:38
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3592

Regen breaking on series wound dc motor

well, actually I already have done such experimental device to switch the motor into genaration. I made HF tranformer, driven by IGBT, and diode rectifier after transformer. Also there is a regulating resistor to regulate Field current from 0 to 230A. The total power I need to get 230A in the field ...
by Alex_Brooy
Sat, 11 Dec 2010, 14:20
Forum: General EV Discussion
Topic: Regen breaking on series wound dc motor
Replies: 17
Views: 3592

Regen breaking on series wound dc motor

Hi guys, I did not know where to put this topic, so I thought its better to start it here. I use my EV during 2 years. I think it is possible to get regenarative breaking on series wound dc motor (like Costov or AdvancedDC). We only need galvanicaly insulated source to power up the stator field. Did...
by Alex_Brooy
Tue, 09 Mar 2010, 12:54
Forum: Batteries, charging, management and monitoring
Topic: Thundersky vs Hi-Power Lithiums
Replies: 14
Views: 2854

Thundersky vs Hi-Power Lithiums

I detect the end of charge cycle when all balancers are switched on. Charging current falls down to aprx. 1,5 A. The voltage of every cell is 4 - 4,1 V.
There is no timer.
by Alex_Brooy
Mon, 08 Mar 2010, 03:53
Forum: Batteries, charging, management and monitoring
Topic: Thundersky vs Hi-Power Lithiums
Replies: 14
Views: 2854

Thundersky vs Hi-Power Lithiums

I charge with 7-10A depending on DOD. Charging is going with the help of transformer with rectifier - it means CV all the time. The resistance is 2 x 5,6 Ohm in paralel, or => 1,4A when balancer is "on". Practice has shown that nothing extraordinary had happened during 10'000km. Ones again, I'm not ...
by Alex_Brooy
Mon, 08 Mar 2010, 01:55
Forum: Batteries, charging, management and monitoring
Topic: Thundersky vs Hi-Power Lithiums
Replies: 14
Views: 2854

Thundersky vs Hi-Power Lithiums

I think it's time to make a topic something like "BMS: to be or not to be" :) I agree that it is very nice to have bms onboard. Someday I will have it, no doubt. I don't have it not because of a good life. Factory made BMS is rather expensive for me (don't forget, I am from Ukraine with its average ...
by Alex_Brooy
Sun, 07 Mar 2010, 01:25
Forum: Batteries, charging, management and monitoring
Topic: Thundersky vs Hi-Power Lithiums
Replies: 14
Views: 2854

Thundersky vs Hi-Power Lithiums

"if the user avoids deep discharges, and manually balances the pack once in a while, they can run without a BMS. " - How can you balance the pack manually? I charge my ev during night. It's unreal to check every cell manually during 4-6 hours. Even during 1 hour. Or did I misunderstand something? Yo...
by Alex_Brooy
Sun, 07 Mar 2010, 00:01
Forum: Batteries, charging, management and monitoring
Topic: Thundersky vs Hi-Power Lithiums
Replies: 14
Views: 2854

Thundersky vs Hi-Power Lithiums

Hello, EV owners. I use ThunderSky's LFP90aha on my little vehicle. I do not use BMS, but do use balancers. I have already passed 10 000 km from march 2009 till now. I don't understand how Ford Ranger's owner has run 7000 miles without balancers. I tried to run about 10 cycles on my LFP90Ah without ...