Search found 96 matches

by Faz
Fri, 12 Aug 2011, 20:56
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

Alternative to Headway cells

Johny wrote: A tad dangerous to put that may Lipos in one place without a BMS.


Agreed, there is something about having +50kg of Lipo between my legs that I find worrying!!! Image
Don't think I'd go Lipo on a bike.
by Faz
Fri, 12 Aug 2011, 16:18
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

Alternative to Headway cells

For a usable bike (ie: needs to be able to overtake without taking hours needs to get to speed quickly and be able to do more than 100km/h) I think you need about 30kW peak. Even using the lightest of cells a 6kWh pack is going to be about 60kg. An engine/gearbox from a 250cc bike weighs about the s...
by Faz
Thu, 11 Aug 2011, 23:56
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

Alternative to Headway cells

They do show a discharge graph plotting cell voltage vs capacity @ 10C. Take it with a grain of salt but on the graph the cell voltage maintains around 2.9V. So are you anti-Headway Rich? What do you consider the overall quality of the cell to be like? If I could get Headway cells for $1.30/Ah I wou...
by Faz
Thu, 11 Aug 2011, 20:33
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

Alternative to Headway cells

I already ruled out Thundersky because of the low C rating. Its just not possible to fit enough on a bike and get reasonable power (without panniers). The concern I have with paralleling many cells is I've not seen any info concerning the differences in cells from the one manufacturer. I would be co...
by Faz
Thu, 11 Aug 2011, 18:17
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

Alternative to Headway cells

Thundersky are $1.30/Ah for full size pack from EV Works: http://evworks.com.au/index.php?product=BAT-LFP100AHA They're $1.43/Ah (QTY 45+), the prices on evworks are ex GST. If anybody wants the contact details for the Headway supplier I can give them to you. I'm very interested. Is the price of $1...
by Faz
Thu, 11 Aug 2011, 01:08
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

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 dr...
by Faz
Wed, 10 Aug 2011, 21:07
Forum: Batteries, charging, management and monitoring
Topic: Alternative to Headway cells
Replies: 22
Views: 4168

Alternative to Headway cells

Has anybody used Fullriver Lithium cells? I'm looking at these: Part number130160160Fe       http://www.fentbattery.com/en/Cylindrical.asp?id=452 I've just had a quote on the flat 20Ah cells: $35USDea for QTY of 100. The spec sheet claims a discharge current of 10C, peak of 30C. They are 160mm x 160...
by Faz
Tue, 09 Aug 2011, 23:16
Forum: Batteries, charging, management and monitoring
Topic: New LiFeTech Energy HEHC LiFePO4 Cell
Replies: 15
Views: 4248

New LiFeTech Energy HEHC LiFePO4 Cell

lithbattboss wrote:How do you have any idea what the price will be? I have no idea of the price myself as yet.

Both the 20Ah and 25Ah cells will be released in 2011.
What about now?
Do you have an idea of the price?
by Faz
Sat, 06 Aug 2011, 00:43
Forum: Members Machines
Topic: Voltron, the Electric RG!
Replies: 142
Views: 29991

Voltron, the Electric RG!

PM'd
If you are in Perth on the 30th of August you might want to check out the Manheim bike auction.
http://www.manheim.com.au/brvm/items/31 ... ionListing
Nice little 2010 CBR1000 there.
by Faz
Sat, 06 Aug 2011, 00:09
Forum: Members Machines
Topic: Voltron, the Electric RG!
Replies: 142
Views: 29991

Voltron, the Electric RG!

Spray putty would help depending on how good your bogging was. If you have sanded back the bog and have a reasonably smooth surface it should be o.k. I'll be using wax and release agents anyway so as long as it isn't badly pitted it won't matter. You work at UWA as well don't you?
by Faz
Wed, 03 Aug 2011, 21:05
Forum: Electric motors and controllers
Topic: 2 BLDC motors 1 controller..?
Replies: 12
Views: 4297

2 BLDC motors 1 controller..?

Thanks Rich. I'm actually thinking about a car conversion.
I've got my eye on a Honda city on ebay. Was thinking about two ME0913's. If they can reach the claimed peak of 30kW each I reckon it would be a good little ev.
by Faz
Tue, 02 Aug 2011, 18:58
Forum: Electric motors and controllers
Topic: 2 BLDC motors 1 controller..?
Replies: 12
Views: 4297

2 BLDC motors 1 controller..?

woody wrote:
You need to have independent access to each end of each phase, I.E. 6 wires from each motor.


And that's why I couldn't get my head around the layout. As any BLDC motor I've seen is only three wire.
by Faz
Tue, 02 Aug 2011, 17:02
Forum: Electric motors and controllers
Topic: 2 BLDC motors 1 controller..?
Replies: 12
Views: 4297

2 BLDC motors 1 controller..?

Thanks for the replies guys.
Tritium I'm having a problem getting my head around the diagram for running two three phase BLDC's in series? Image
Can this be done with both delta and star motors?
by Faz
Mon, 01 Aug 2011, 20:39
Forum: Electric motors and controllers
Topic: 2 BLDC motors 1 controller..?
Replies: 12
Views: 4297

2 BLDC motors 1 controller..?

I assume this means the phase wires would be wired in parallel? That was my thinking. Assuming the motors are of the same type but not specifically matched in inductance or impedance. ie: two from the same factory but with no effort made to select closely matched motors. Is there any side effects o...
by Faz
Mon, 01 Aug 2011, 18:58
Forum: Electric motors and controllers
Topic: 2 BLDC motors 1 controller..?
Replies: 12
Views: 4297

2 BLDC motors 1 controller..?

The question is, can two BLDC motors be controlled with one (suitably rated) controller? I wouldn't expect proper operation with sensorless controllers but if two motors are rigidly connected, phased correctly and used with a hall sensor would it work? I would expect yes but please give me feedback ...
by Faz
Fri, 22 Jul 2011, 21:04
Forum: Scooters, mopeds and electric toys
Topic: Electric Trikes for Road Use
Replies: 13
Views: 4672

Electric Trikes for Road Use

If you are planning on using one of the RC controllers you might run into trouble. They don't have a very high peak current rating which isn't a problem when running those motors in a plane but on a scooter with high starting torque requirements they may not be up to the job.
by Faz
Fri, 22 Jul 2011, 20:54
Forum: Batteries, charging, management and monitoring
Topic: Li-Ion Battery-Higher Energy density than LiFePO4
Replies: 14
Views: 2023

Li-Ion Battery-Higher Energy density than LiFePO4

I stand corrected.
Thank God for nerds! Image
by Faz
Thu, 21 Jul 2011, 16:45
Forum: Batteries, charging, management and monitoring
Topic: Li-Ion Battery-Higher Energy density than LiFePO4
Replies: 14
Views: 2023

Li-Ion Battery-Higher Energy density than LiFePO4

Ummm.....you can't have a recharge rate measured in mAh (milli amp hrs) just mA (milliamps), 6500mA is 6.5amps. The rated discharge rate is 10 amps but recharge is only 6.5 amps so if a battery pack was built with enough cells the regen would still need to be limited compared to the discharge rate....
by Faz
Wed, 20 Jul 2011, 01:52
Forum: Batteries, charging, management and monitoring
Topic: Li-Ion Battery-Higher Energy density than LiFePO4
Replies: 14
Views: 2023

Li-Ion Battery-Higher Energy density than LiFePO4

Cycle Performance     80% of initial capacity at 1000 cycles you would need a lot of them for an EV with a 10a discharge rate and a recharge rate limited to 6.5a, regen wold be limited. i wonder if the weight saving between to 2 chemicals would be lost because of the extra packaging. T1 Terry It is...
by Faz
Wed, 20 Jul 2011, 01:31
Forum: Members Machines
Topic: Voltron, the Electric RG!
Replies: 142
Views: 29991

Voltron, the Electric RG!

Yeah I figured the Busa might be a little bigger (and heavier) than you would really want. Happy to do the glass work for you. Bare in mind I'm not a professional but have done a fair bit of fibre glassing in the past. Rather than trying to bulk up the tank to get what you want have you thought abou...
by Faz
Tue, 19 Jul 2011, 21:42
Forum: Members Machines
Topic: Voltron, the Electric RG!
Replies: 142
Views: 29991

Voltron, the Electric RG!

I spoke to you briefly at the AEVA meeting the other week. You were saying you felt the chassis was letting you down. Are you sticking with this chassis or going to change over to something else soon? A few months ago I saw two 2002 (or near that year) Hyabusa's for sale in the Quokka. They were onl...