AEVA Forums

im surprised pot boxes are still being considered by EV converters.
why not a HEPA?

Matt

Hi plugger, very little power is developed by an adc 9" (FB4001) at 7k rpm. ideally in 5th at 100kmh you would want a rotational speed of 3-4k rpm. since you are keeping the gearbox, getting it perfectly ratioed isnt quite as important. go for a bigger motor if it will fit. the larger the motor the ...

I would steer clear of parralleling cells if possible. having more than one string makes the wiring more complicated. you are better off with either 160AH or 200AH units than 2x90AH strings. 150wh/km from the batteries should be about right for an excel or similar small car. is there any possibility...

Hi Plugger,

what electric motor are you using that can go to 9k?
are you planning on retaining the gearbox?

whether the tacho will work post conversion will depend largely upon your choice of donor vehicle.

Matt

hi richo,

200x ts lfp40s is only 300kg, why would you need to remove the back seat?
robs latest 318i converison has 290kg of lithium in it, and the back seat is being retained. (of course it hasnt gone through rego just yet)

Matt

Hi Ken, if you are going the dc motor route, you would probably be after something like an adc L-91 6.7". to run it properly, you would want around 120v. i havent actually seen any of the K2 cells assembled into packs yet, but based on their ratings would seem to do the trick. I heard a rumour Ian w...

gday tropicalev, yes a kw is a kw, but the different torque curves make comparisons a little more complicated. since we (as in the ev crowd) are usuall more battery limited in the way of power, a kw peak from a electric motor is worth more than a kw peak from a ICE motor, as the peak on an electric ...

just one point,
if you aim for a range of 60km, your average dishcharge will be 1C or more.
ac 1C or more, count on 3vpc as the nominal voltage for energy available/range considerations.

Matt

Hi tuarn,

does that mean you have already hooked up the lithium cells to your vfd?
or are you some how getting around 700v from your henda batts to your vfd?
otherwse how are you getting 500v at the motor?


Matt

Hi Goombi, good idea with the battery placement. one thing you have to watch out for with monocoque frame cars is that its strength changes in unusual ways when you cut into them. the whole point of having a monocoque frame is so that there is no main frame. i know alot of the body "anti-sway" stiff...

Hi Peter, most controllers allow you to set battery and motor current limits independantly. i know for a fact, the zilla controllers can have independant current limits. a 90AH cell only sags to 2.6v at 270A. (or 117v for a 144v nom pack, 31.6kw) at 450A, cell voltage is 2.2-2.3v (or 99v for a 144v ...

a few points of clarification: assuming the control has good ripple caps on the input side, and the motor has a reasonalbe amount of inductance, the controller controls, motor and battery side current independantly. so 200A at the motor may be only 30A at the batteries at low speed. under cruising c...

Hi Mal,

when the main server went down, Andrew had to switch the forums to the backup server.
while we're on the backup servers, all sorts of things wont work right.
email notifications of any kind are on the things that dont work.

should be fixed when the main server is back up.

Matt

a few points of clarification: assuming your controller has good ripple caps on the battery side, and the motor has a reasonable amount of inductance, the controller will trade volts for amps. lfp90aha can do 270A continuous, but 450A for several seconds (with 500A+ for milliseconds if the ripple ca...

haha,

yeh, tuarns got a couple and ive got a couple aswell:p

just cant seem to stop at one.

140kg is about what the ac55 weighs isnt it? i cant remember. i suggested 2x warp 9 from an efficiency point of view, smaller motors wont be as efficient, though might get the job done. maybe 2 x impulse 9s at 110kg might be better. the batteries of the size proposed can put out 170kw (1000A 172.5v ...

2 direct driven DC motors (wired in series) will give the same effiency (from an energy used per km perspective) as a single AC motor with a gear box. both setups would cost a similar amount. both will need to be run at a similar voltage (300v) its just a matter of which is cheaper, easier and avail...

from memory, a warp 9 has max power point around 4000rpm, if you can feed it the full 1000A at 170v. the resistance loses in a electric motor are more significant than the mechanical friction loses. at a higher rpm you have to feed the motor less current for the same mechanical power output. the los...

for testing for intermittent current ability of a battery, i suggest buying one of these: http://cgi.ebay.com/ebaymotors/BRAND-NEW-500-AMP-CARBON-PILE-BATTERY-LOAD-TESTER_W0QQcmdZViewItemQQ_trksidZp1638Q2em122QQcategoryZ43989QQihZ008QQitemZ180274997392QQrdZ1QQsspagenameZWD2V very handy piece of equi...

oh, when i refer to lessening the acceleration requirement not making anything cheaper, i was refering to a DC system.

AC is a different story.

actually for 40kwh usable with 60AH cells, you need 260 units. you shouldnt have to rely on going past %80dod to get your range requirement (i learnt this the hard way). cutting back on the acceleration requirement wont make it cheaper, unfortunately. do you know what the ratios are on your current ...

dont worry, a BMS isn't hard to wire up.
the wires are usually colour coded, just match up the colours

hiya squid, welcome to the forum. if youre getting 10L/100km, you need usable capacity about 20kwh/100km. so for 200km range, you need 40kwh. to get 40kwh, you need 75x200AH lithium cells: weight will be 525kg max power will be 170kw. itll cost around $24k. have to say, range is expensive to buy, an...

how fast is the motor spinning at 60kmh? what motor are you using? what size wheels and what gearing are you using? max power is 75kw at 105v. this isnt much use if your motor back emf is 150v. instrument readings would definately be helpful. i think you can get a live current reading from the hairb...

out of curiosity, how much did the pc680's cost you?