Search found 980 matches

by T1 Terry
Sat, 19 Feb 2011, 17:38
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 223
Views: 39804

4Springs' Brumby

I also need to get a flange made to adapt between the drive shaft on the motor, and the 8 bolt holes on the flywheel Are you planning to use the flywheel with the electric motor? Are you keeping the clutch? The flywheel can be machined down to the diameter of the pressure plate and the back machine...
by T1 Terry
Sat, 19 Feb 2011, 02:41
Forum: Batteries, charging, management and monitoring
Topic: Lead acid battery selection
Replies: 20
Views: 4281

Lead acid battery selection

I was of the understanding that one crook cell was the end of the entire battery. So that all 12 (12V) batteries would need to be disposed of if one collapsed? If one “cell” collapses and you catch it in time the rest of the cells that make up the whole battery can be saved. (I.E. It takes 12 12v b...
by T1 Terry
Fri, 18 Feb 2011, 13:12
Forum: Batteries, charging, management and monitoring
Topic: Lead acid battery selection
Replies: 20
Views: 4281

Lead acid battery selection

There is a CSIRO test paper on the battery energy cells, I think it was Dr David Brown that I communicated with there, he was going to send me a more detailed report on these cells but basically they are reported to handle savage discharge and recharge regimes without falling over from an early deat...
by T1 Terry
Fri, 18 Feb 2011, 03:43
Forum: Batteries, charging, management and monitoring
Topic: Lead acid battery selection
Replies: 20
Views: 4281

Lead acid battery selection

This is going to sound like a retrograde step but if you must use lead acid batteries I'd recommend flooded cell batteries. They are high maintenance and messy but they can be cell tested and equalised much easier than AGM batteries. If you have the room use multiple 6v rather than 12v units, one cr...
by T1 Terry
Thu, 17 Feb 2011, 13:20
Forum: Electric motors and controllers
Topic: EV kits
Replies: 4
Views: 1631

EV kits

Good find, thanks. I've sent off an inquiry regarding a motor and controller, the water cooled 48v AC with regen was very appealing. It looks like a Curis controller in their photos. The twin motor unit looks very interesting, it would be the answer for direct drive trans axle applications with it's...
by T1 Terry
Tue, 15 Feb 2011, 20:48
Forum: EV Racing
Topic: 7.46@177.05
Replies: 7
Views: 1965

7.46@177.05

I think there being no noise then it just taking off would scare the crap out of you... Larry McBride hehe imagen sitting on something like that but looks more like a real bike at the lights next to a cop car lights go green you disappear I think you'd need a blue police box or a DeLorean and a cou...
by T1 Terry
Mon, 14 Feb 2011, 17:41
Forum: Members Machines
Topic: Obsolete Thread
Replies: 576
Views: 90619

EV2Go's - Lithium Powered Trike

I've worked with taper locks in heavy industry. We used them to hold the pinion gears on the hydraulic motors to drive the winch drum and luffing drum for some of the smaller site cranes, up to around 22 tonne lift from memory. Also used a lot for drive couplings. I can't give you any specs for grip...
by T1 Terry
Mon, 14 Feb 2011, 17:24
Forum: Members Machines
Topic: My TZR 250 EV project
Replies: 94
Views: 25017

My TZR 250 EV project

I should mention - I have aluminium foil over a piece of 3 ply and down the sides so the fiber glass wont stick. Handy tip to try and remember for when I get to body work. I use gaffer tape and a coat of silicon spray, easier to work with, the fibreglass bit just pops off, hopefully http://forums.a...
by T1 Terry
Mon, 14 Feb 2011, 03:27
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

The controller specs say it's rated for 2 mins @ 550amp but I'm assuming that's a heating issue so if I water cool it I should be able to extend that to the 10 min max in either drive or regen I hope. I have no idea regarding the motor and heat generation at peak drive amps or regen amps, a thermo f...
by T1 Terry
Mon, 14 Feb 2011, 02:13
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

the absolute maximum average VPC is 130 / 36 = 3.61 V, so you will have to honour the 3.6 V limit pretty closely. Good point, hadn't thought of that one, at least I won't have an issue with over charging the batteries. If the AC50 motor draws a max of 500amps @ 96v what would the max regen voltage ...
by T1 Terry
Sun, 13 Feb 2011, 22:36
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

Not really. That's the maximum *discharge* rate I've taken the voltage droop into account by adding 2 extra batteries to each 48v pack, 18 instead of 16 cells, as a bonus I don't need to recharge to a high cut off voltage to get the capacity but regen is an issue I still need to iron out. Both the ...
by T1 Terry
Sun, 13 Feb 2011, 13:49
Forum: General EV Discussion
Topic: My VicRoads Adventure
Replies: 8
Views: 2540

My VicRoads Adventure

This is from the "Independent Living" website relating to electric mobility vehicles " In NSW, motorised wheelchairs that weigh less than 110 kg and cannot travel at more than 10 km/h do not have to be registered, provided they are being used by a person with mobility problems. A person driving a mo...
by T1 Terry
Sun, 13 Feb 2011, 04:27
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

Buggered if I could follow your maths path Woody but somehow we came to the same answer assuming the 2.6v bit is correct but I'm not sure how this figure was calculated either. 2 batteries of 36 300ah cells @ 2.6v = 56.16kw. Now I'm assuming this it the max amount of regen current the batteies will ...
by T1 Terry
Fri, 11 Feb 2011, 22:42
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

72 x 3.2V x 100Ah = 23kWh So 78kW/23kwh = 3.3C This exceeds the "claimed" max charge of 3C on TS cells. Considering the nominal is only 0.5C (11.5kW) But isn't the max charge voltage 3.65v? That would make it 72 x 3.65 x 100 = 26.28kwh. 78kw/26.28 = 2.96C, just inside the 3C limit. They actually cl...
by T1 Terry
Fri, 11 Feb 2011, 01:24
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

I've had a deeper look at the choice of batteries and it seems it will need to be Thundersky over CALB, higher charge voltage and higher charging amps to maintain a reasonable cycle life. 2 x 100ah or 1 X 200ah have the same charge acceptance, still unsure if 2 battery banks of 36 x 100ah cells or ...
by T1 Terry
Thu, 10 Feb 2011, 19:38
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

Can the regen be limited to the max capacity of the motor or controller? Is this regen operator variable between zero and full to the max limit set via a hand control? I'm thinking the limit would really be the max acceptance level of the battery pack, the regen current has to go some where, as to w...
by T1 Terry
Thu, 10 Feb 2011, 15:58
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

How long is the run time for peak power? The controller says it can handle 2 mins @ 550amps but no mention as to how long the motor can handle it. My plan is to use the addition torque/HP for hill climbing but mostly for regen braking. I assuming the motor and controller are copping it equally as ha...
by T1 Terry
Thu, 10 Feb 2011, 14:49
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

The kit Matt pointed out in an earlier post uses a HPGC AC50-01, does anyone know how long one of these motors can handle full load before they overheat? The other monster motor on another thread looked the goods until the weight was announced, 220kg is a tad over the top. Also, there is the new hig...
by T1 Terry
Tue, 08 Feb 2011, 03:00
Forum: Batteries, charging, management and monitoring
Topic: Keeping AGM Batteries Warm
Replies: 9
Views: 2257

Keeping AGM Batteries Warm

Wrap the battery pack in an electric blanket perhaps?

T1 Terry
by T1 Terry
Tue, 08 Feb 2011, 00:43
Forum: Technical and conversion discussion
Topic: Clueless take 2
Replies: 70
Views: 11098

Clueless take 2

OK, after reading some in the DIY forum I have discovered that the 550amps may not be battery draw but amps supply from the controller (remember the title says I'm clueless) so how do i find out what the battery amp draw max would be? The next bit is related to battery voltage, the Curtis Model 1238...
by T1 Terry
Fri, 04 Feb 2011, 18:39
Forum: Batteries, charging, management and monitoring
Topic: Battery charging and BMS function
Replies: 17
Views: 2148

Battery charging and BMS function

[quote; Some manufacturers have to quote these high terminal voltages in order to squeak in their AH ratings. /quote] Hmmm.... wondered about that actually. I'm trying to work out how for down the top knee curve I can switch to a low charge or stop charging all together and still maintain a reasona...
by T1 Terry
Fri, 04 Feb 2011, 17:41
Forum: Batteries, charging, management and monitoring
Topic: Battery charging and BMS function
Replies: 17
Views: 2148

Battery charging and BMS function

Ok, now I follow the way it's designed to work and the reason the non shunt folk use about the possiblity of a shunt malfunction destroying a good cell. Next issue is the top balancing, there seems to be a wide view that bringing the voltage to the upper limits shortens cycle life but exactly what i...
by T1 Terry
Fri, 04 Feb 2011, 16:26
Forum: Batteries, charging, management and monitoring
Topic: Battery charging and BMS function
Replies: 17
Views: 2148

Battery charging and BMS function

This is the part I don't fully understand. If a 2 amp shunt is used per cell do these units act as a bypass or a dead short across the cell? The difference being, if it's a bypass then a higher voltage is applied to the cells not yet fully charged but if it's a dead short the charger sees this as a ...
by T1 Terry
Sat, 29 Jan 2011, 00:18
Forum: Batteries, charging, management and monitoring
Topic: LiFeP04 batteries, series only or parallel series?
Replies: 10
Views: 1328

LiFeP04 batteries, series only or parallel series?

Yes, but don't get too complacent just because it's 48V. Low voltage DC with big potential short circuit amps behind it can also do untold damage if it all went wrong... My Lincohn diesel welder at full power puts out 48vdc @ 480 amps, I can burn welding rods the thickness of heavy duty tent pegs a...
by T1 Terry
Fri, 28 Jan 2011, 19:55
Forum: Batteries, charging, management and monitoring
Topic: LiFeP04 batteries, series only or parallel series?
Replies: 10
Views: 1328

LiFeP04 batteries, series only or parallel series?

My house power requirements and recharging are easiest taken care of with off the shelf 48v stuff plus I feel safer around 48vdc than the potential 115vdc when recharging, that's very close to lethal voltages. For this reason I have stayed well away from the higher voltage motors, high voltage DC wi...