new to this

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whistlefly
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Joined: 05/01/2009
Points: 10

can someone help me figure out hp and tq on a build im doing.
300 volt
2 L91 advance motors
z1khv controller with hairball opt a
also what is the advantage of one or two motors
thank you

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reikiman
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Joined: 11/19/2006
Points: 8444
Re: new to this

Build Your Own Electric Vehicle has all the formulas and calculations etc to guide you. I'd think with the equipment you're playing with you'd already have that book or a similar one.

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- Electrified Electra Townie, 1971 Karmann Ghia (since sold), Kia Soul EV

antiscab
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Joined: 07/07/2007
Points: 1686
Re: new to this

those components sound familiar.
my own conversion will run 2x x91s and a zilla 2k ehv (its mechanically complete, just wiring to go)

having two motors means you can series/parrallel shift.
This is useful if your pack voltage at load is lower than 2x the max voltage of the motors, and the controller max current is lower than the max current of the motors.
if either is not true, than there is no advantage.

the limits on the L91 are 120v and 1000A.

depending on how big a vehicle you are converting, it also means you can do away with the gearbox (which unless it was built for low rpm, isnt any use anyway)

as far as how much HP and torque, that depends alot more how on much power your batteries can put out.
can you tell me a bit more about your batteries?

i can tell you that assuming batteries arent the limiting factor (can supply more than 240kw), and voltage at load is higher than 288v, that 2 L91s will give 320 Ft.Lb and peak power point of 240HP at 4500rpm.

your batteries will almost certainly be the limiting factor.

Matt

__________________

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst 2 x TC Charger & MC
conversion
Spent so far: $5800 + $7000 + $2040 + $1200 + $425 + $800 + $140 + $3000
Cost to do it again: $1000 + $3800 + $2040 + $1200 + $425 + $800 + $140 + $1500 (lasts longer)
Cost for a Petrol bike:$6000 + + $1440 + $7560 + $1000 + $1600 + $4000 servicing
Total spent: $20405
Total to do again: $10905
Total to have used a petrol bike: $21600
Total distance travelled so far: 102'120km

Other vehicles:
2008 Mazda 2 conversion
2009 Blade Electron
1997 Prius - plugin hybrid mod

whistlefly
Offline
Joined: 05/01/2009
Points: 10
Re: new to this

thank you for your replys it is very much helpful
everything i learned so far is just reading and talking with people like you guys.im racing in the 300' dirt drags with this new build and hoping my setup will work ok.

the battery pack im going to have built with the a123 nano.im not sure in parrel ans series will be needed for this to have full run time each pass is under 4 sec.the project only weighs 410 complete .

antiscab
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Joined: 07/07/2007
Points: 1686
Re: new to this

wow, thats very impressive.
to push the motors to full power, the pack needs to deliver 1000A at 240v.

so that means at least 110 cells in series, and 10 cells in parrallel.
the more of each, the better.

is the 410Lb or 410kg? either way.....wow

Matt

__________________

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst 2 x TC Charger & MC
conversion
Spent so far: $5800 + $7000 + $2040 + $1200 + $425 + $800 + $140 + $3000
Cost to do it again: $1000 + $3800 + $2040 + $1200 + $425 + $800 + $140 + $1500 (lasts longer)
Cost for a Petrol bike:$6000 + + $1440 + $7560 + $1000 + $1600 + $4000 servicing
Total spent: $20405
Total to do again: $10905
Total to have used a petrol bike: $21600
Total distance travelled so far: 102'120km

Other vehicles:
2008 Mazda 2 conversion
2009 Blade Electron
1997 Prius - plugin hybrid mod

whistlefly
Offline
Joined: 05/01/2009
Points: 10
Re: new to this

its 410lbs. thats the prob im not good with batterys and only want enough battery to last 4 sec. and be drained but have the power i need with keeping the weight down. thats where the parrallel im not good with lol

antiscab
Offline
Joined: 07/07/2007
Points: 1686
Re: new to this

of the 410lbs, how much have you set aside for battery?
1100 M1 A123 cells will weigh 170lb.

each 110 cell string can supply 120A at 240v for 4 seconds.
so you need 10 strings to get the full 1000A at 240v.

A123 M1 cells are about the most power dense batteries money can buy.
the only battery that *might* do better is the Lithium Cobalt Polymer batteries that the RC guys use.

theres no battery you can buy today that can completely discharge in 4 sec.
even the A123 at max discharge takes 3.5 minutes.
for your application, power density is more important to know.

Matt

__________________

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah
Vectrix 60Ah Lithium Tyres Fuel Registration Insurance cycle analyst 2 x TC Charger & MC
conversion
Spent so far: $5800 + $7000 + $2040 + $1200 + $425 + $800 + $140 + $3000
Cost to do it again: $1000 + $3800 + $2040 + $1200 + $425 + $800 + $140 + $1500 (lasts longer)
Cost for a Petrol bike:$6000 + + $1440 + $7560 + $1000 + $1600 + $4000 servicing
Total spent: $20405
Total to do again: $10905
Total to have used a petrol bike: $21600
Total distance travelled so far: 102'120km

Other vehicles:
2008 Mazda 2 conversion
2009 Blade Electron
1997 Prius - plugin hybrid mod

whistlefly
Offline
Joined: 05/01/2009
Points: 10
Re: new to this

i think the batteries im looking into are the 26650 3.3volt each and 70 grams each if im correct.

whistlefly
Offline
Joined: 05/01/2009
Points: 10
Re: new to this

i just dont understand the battery thing other then getting the 300volts.with the ah im not sure with the how many stacks part to get the amps i need. im still in the learning stage. i do know with this electric project im hooked on it now lol

thank you for all your help

Juiced
Juiced's picture
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Joined: 04/28/2009
Points: 31
Re: new to this

Good Luck!

Ed

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