Search found 90 matches

by Hemonster
Fri, 15 May 2009, 18:58
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hey Johnny, that's very interesting thanks for posting. I wonder if they guys buy from Headway or claim to also be yet another manufacturer. One thing my boss saw at the last China fair was that there are lots of companies who use "public tooling" .... where a company designs a generic solution and ...
by Hemonster
Thu, 14 May 2009, 13:28
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Pull-in at 66% voltage means that they are guaranteed to pull in (close) at 8 volts if rated for 12 volts. Hold in is similar - they will continue to stay closed at 25% of rated voltage (3 Volts). What this means is that you could put 3 in series off 12 V - making 4 V per contactor, provided you ap...
by Hemonster
Thu, 14 May 2009, 02:37
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

I am very interested in the contactors you are getting. Is the $8 with magnetic blowouts? When are you placing your order? I'm getting 16 of them direct from NanFeng (2 spare), but am yet to receive a proforma invoice from them, should be today I expect. They were going to advise postage to NZ, but...
by Hemonster
Thu, 14 May 2009, 02:19
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hi Hemonster, Did you get a price on those 48v batteries? Yes I did, the one in the white plastic case was USD$560 per pack with charger and BMS! ... that's the same price as the EVPST pack, except its twice the capacity. Hmm ... starting to look like a good deal as this pack can give me 80km range...
by Hemonster
Wed, 13 May 2009, 01:51
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Contactors: Incidently I'm planning on getting these 48V contactors from NanFeng direct. http://www.contactordc.com/9_zjwh100a_dc_contactor.html It is a SPDT which I'm going to use per 48V pack. When the coil is energised it is connected to the HVDC string, when it is deenergised it is connected to...
by Hemonster
Wed, 13 May 2009, 01:32
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hey, has anybody considered these 48V 20AH battery packs from Headway?

http://headway-cn.en.alibaba.com/produc ... _pack.html


http://headway-cn.en.alibaba.com/produc ... ttery.html
by Hemonster
Tue, 12 May 2009, 21:00
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

This first conversion should be a low-risk low-cost learning experience. I'd even suggest starting with second-hand lead-acid and use a van with some seats removed, as you suggested, and build the battery boxes on top of the floor for the first pass. Actually I was considering going for the more ex...
by Hemonster
Tue, 12 May 2009, 14:13
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Ponderings .... EVPST cells are great for an elegant solution, however they aren't truly great on price for the amount of range you get. Here are my calculations: Say it takes 8kw to run my car on average at 50 km/hr, and for now we simplify things by averaging out the accelerations and deceleration...
by Hemonster
Sat, 09 May 2009, 15:39
Forum: Batteries, charging, management and monitoring
Topic: Optimum China Batteries
Replies: 70
Views: 13590

Optimum China Batteries

What about Sky Energy 40 Ah SE series? They are 4C continuous, 12C pulse. 4C is 80A, pretty close to your "continuous" requirement, and there is a long way to 12 C*, so 90 A would not stress them very much. Sky energy are one of the suppliers of Thunder Sky cells, so they seem to know their stuff. ...
by Hemonster
Fri, 08 May 2009, 18:30
Forum: Batteries, charging, management and monitoring
Topic: Optimum China Batteries
Replies: 70
Views: 13590

Optimum China Batteries

I work out 50 Greensavers @ 50% Dod = 6.6kWh (but extra 233kg) 50 Firststart 18Ah (12.6Ah 2 hour race) @ 80% DoD = 6.6kWh (extra 188kg) Anecdotally I've seen mentioned that cruising 50-60km/hr is about 6-7kw required? However during modest acceleration you should expect say 30kw (conservative) whic...
by Hemonster
Fri, 08 May 2009, 18:04
Forum: Batteries, charging, management and monitoring
Topic: Optimum China Batteries
Replies: 70
Views: 13590

Optimum China Batteries

Hey Johnny, Exactly in your boat. Though I've written to EVPST to send me 2 samples of each 10AHr adn 12AHr cells. I plan to test these using a labjack setup such as Ian did on Zeva. I don't need the sort of lead foot power levels that you're after, so 50A is quite adequate for continous, range is m...
by Hemonster
Thu, 07 May 2009, 13:25
Forum: Batteries, charging, management and monitoring
Topic: Battery paralleling circuit
Replies: 24
Views: 4251

Battery paralleling circuit

The idea is to fix the first short before the second one happens. However the problem as I see it is that when you get the warning, you don't know if it was one short or two shorts - ie. do you stay in the car and drive home and put "check electrics" on your todo list, or get to the kerb ASAP NOW! ...
by Hemonster
Thu, 07 May 2009, 03:02
Forum: Batteries, charging, management and monitoring
Topic: Battery paralleling circuit
Replies: 24
Views: 4251

Battery paralleling circuit

Hi acmotor, Thanks for that reply. Fuses.... Both on traction lines (-,+) to controller and on all charger connections. Fuse at at least each location of the battery pack sections i.e. bonnet and boot. For an overcurrent breaker to trip means controller has failed, so you won't just be resetting the...
by Hemonster
Thu, 07 May 2009, 02:46
Forum: Batteries, charging, management and monitoring
Topic: Optimum China Batteries
Replies: 70
Views: 13590

Optimum China Batteries

Hey Woody,

Are you still interested in EVPST cells as well? I thought of getting a few samples, but wondered if you had already got them and done some testing?


by Hemonster
Tue, 28 Apr 2009, 02:23
Forum: Technical and conversion discussion
Topic: NCOP14 regulations, safety and revision
Replies: 143
Views: 18921

NCOP14 regulations, safety and revision

Hi everybody, Let's see if I can get my head around this thread. Basically for any series string that is getting up in voltage (mine will be 600VDC), you have to consider some safety measures. This should be done irrespective of the law and be in consideration for Joe Anybody to drive and operate th...
by Hemonster
Sun, 26 Apr 2009, 18:27
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hi Coulomb, I had to get a foot mounted motor as it was what was available 2nd hand going for cheaps. The flange I ordered direct from TECO the manufacturer and cost half as much as the motor again, but still all up the price of the motor with the flange was ok - and really the motor hasn't even bee...
by Hemonster
Sun, 26 Apr 2009, 02:23
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hemonster, You did an awesome job of summarising that huge thread on AC motors. Now here's another one for you (not quite so long) on " To chassis-earth or not to chassis-earth? ". I'm still working my way through this thread, it's filled with goodies but does need a bit of a summary for somebody j...
by Hemonster
Sun, 26 Apr 2009, 02:20
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Just an update. My 2pole motor came as a foot mount and today I connected a flange mount to it for mating to a gearbox better. I took the oppurtunity to take some photos of the insides of the motor. http://forums.aeva.asn.au/uploads/624/IMG_6164-1.JPG The shot of the motor with the front face off, y...
by Hemonster
Sun, 26 Apr 2009, 02:07
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hey thanks Nuts, you've given me something to consider now ... :) We will chat more as time progresses I'm sure.
by Hemonster
Sat, 25 Apr 2009, 01:27
Forum: Batteries, charging, management and monitoring
Topic: Optimum China Batteries
Replies: 70
Views: 13590

Optimum China Batteries

Are you sure these are A123 nano phosphate cells? not just some company trying to pass off their cells as A123 and cream the premium? Not trying to be cynical, just that I know there are a fair number of rip offs around - and batteries (like memory cards) are prime for the rip off market because its...
by Hemonster
Fri, 24 Apr 2009, 18:38
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

On the subject of CVCC chargers, I'm looking at these puppies:
http://www.wellforces.co.nz/index.php/C ... e.tpl.html

edit: might help if I put the link in Image
by Hemonster
Fri, 24 Apr 2009, 18:37
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Ahh true true ...
by Hemonster
Fri, 24 Apr 2009, 18:22
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hemonster, I would not underestimate the 0-40kmph acceleration of your proposed setup. I would predict it to be quite satisfactory. It will be the higher speeds where performance will fall short. By then you will have the EV bug and a good stepping stone. It would seem like top end speed is the bug...
by Hemonster
Fri, 24 Apr 2009, 18:08
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hi Coulomb, Thanks for the reply. Another thing I thought was using a DPDT (or DPST) for each of the charger's two terminals, the coils get energised by the charger voltage itself (via some voltage reduction). These only need to be 60V 8-10A rated and should be relatively cheap? Err, not if I unders...
by Hemonster
Fri, 24 Apr 2009, 15:58
Forum: Members Machines
Topic: Hemonster's ACIM conversion
Replies: 189
Views: 33810

Hemonster's ACIM conversion

Hi Nuts, Thanks for the links, these do indeed appear to be the same cars ... but as I suspected they are HEAVY beasts! averaging >1700kgs and losing the back seats ... :( not really my style - I've got kids after all and I want us to enjoy the car as a family. I have since found that the Mitsi Char...