Small old but fast electric car.

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Small old but fast electric car.

Postby offgridQLD » Thu Dec 10, 2015 9:10 am

https://www.youtube.com/watch?v=u6VJ6_4yCkw

1400A at 275v in the test drive 385kw!

1800A at 275v gave him a 10 second 1/4 mile with 495kw!

At a guess with the tiny aluminum body the car would be 600kg - 800kg max. Nice power to weight.

What gets me is just how good lithium batterys are he mentions there is 140kg of batterys (so at a rough guess using the weight) he has perhaps 12kwh of battery. A lot less than the typical offgrid bank house bank of around 20kwh. So you can rest easy when you spike your inverter and put a 10kw load on the bank. Its got to be kinder than 495kw! on 1/2 the size bank :shock:

Kurt
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Re: Small old but fast electric car.

Postby Gordon-Loomberah » Thu Dec 10, 2015 3:44 pm

Huge power delivery all right, but I suspect the battery will be long dead by 10 years ;)

I've seen a few 12 and 13kW spikes here, when the aquaponics water chiller starts from cold, no problem at all with that.
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Re: Small old but fast electric car.

Postby offgridQLD » Thu Dec 10, 2015 4:31 pm

Sure, EV's are harder on the cells than stationary storage. Though any light weight internal combustion engine that can produce 490kw - 660hp and the same amount of torque would most likely not last a few years if driven hard on the street.

Another thing to consider is your not going to be pulling 1800A at 265v for very long in that car befor your doing some silly speed.

"I've seen a few 12 and 13kW spikes here, when the aquaponics water chiller starts from cold, no problem at all with that."

Is that a refrigerated system?


Kurt
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Re: Small old but fast electric car.

Postby Gordon-Loomberah » Thu Dec 10, 2015 4:52 pm

Not refrigerated as in 4C ;) The 2HP chiller (uses ~2.3kWDC before the inverter in mild temperatures), and in hot weather I try to keep the temps in the high teens, although it's over 20C today as it was overcast with a few storms yesterday, and more of the same today, although it has cleared up a bit this arvo and I have it running now.
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Re: Small old but fast electric car.

Postby offgridQLD » Thu Dec 10, 2015 5:12 pm

Nice one,
I'm sure people still conjure up Images of candles, generators and 12v appliances when you mention offgrid living. :lol: and here we are chilling large tanks of water, running multiple Air conditioners and charging electric cars and the like.

It's actually a bit if a effort trying to use all the power most days. If anything I have actually become a bit wast full with my electricity living offgrid as it's not taxing my wallet every day I leave appliances running or go for random drives in the EV.

Back on topic a bit. I think the future of home built EV projects will be in using parts from wrecked OEM electric cars. There are all ready a few that have hacked the Tesla model S and have aftermarket systems to hook up to a drive unit and power electronics (The motor controller, motor and reduction drive is all in one in the Tesla model S) plug and play aftermarket units. Though it gets kind of hard to store 85kwh of battery into a chassis that wasn't built around the battery like the S. A RWD single cab ute with a Tesla drive system and the base of the tray made of of the 85kw bank is about the only practical way I use one.

kurt
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Re: Small old but fast electric car.

Postby Smurf1976 » Thu Dec 10, 2015 5:56 pm

offgridQLD wrote:Back on topic a bit. I think the future of home built EV projects will be in using parts from wrecked OEM electric cars.


If electric cars become mainstream then it won't take long before there's plenty at your nearest wreckers yard.

The average life if a car is around 20 years until it's scrapped (average age of cars actually on the road being about half that) but due to accidents even fairly new models do end up being wrecked.
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Re: Small old but fast electric car.

Postby offgridQLD » Thu Dec 10, 2015 6:22 pm

Yes lots of wrecked Tesla's in the US all ready. People who have never owned a performance car purchases a car that can do 0-100 in 3 seconds (model S) a few days later.OOOPS!

You can pick up a 85kwh battery for about $10,000 US. the rear clips are inexpensive if you just want the drive components. Considering what your getting.

I think with EV's it's more people wrecking them due to a smash. A lot of Internal combustion engine cars just start to get tired after 10 - 15 years. Sure the batterys will do the same in A EV but the motors just keep spinning as they did the day you got it. No compression loss or burning oil. Though I guess the body's will start to look weathered and dinged up over time.

Every time I get in our Ute now I keep thinking something is wrong with it because of all the strange noises and vibrations. I keep thinking. Should that really be that load or vibrate that much. Cant believe I use to think that is just how things are when you drive a car. All this gear changing and and spending time while the RPM builds up to create power :lol:

Kurt
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.
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Re: Small old but fast electric car.

Postby station240 » Fri Dec 11, 2015 2:20 am

Actually I was watching this video the day before you posted it.

Anyway I found some more info on the car.
http://electrek.co/2015/11/27/1974-enfi ... ged-video/
http://www.driving.co.uk/news/jonny-smi ... ssan-gt-r/
Video on the Battery pack and BMS
https://www.youtube.com/watch?v=C8cj-0j4zaY

The batteries are military grade cells made by Kokam.
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Re: Small old but fast electric car.

Postby offgridQLD » Fri Dec 11, 2015 9:27 am

The pack voltage they mention so many variations from 250 - 400v. I'm guessing it's around 360v nominal and getting close to 400 hot off the charge. Though 250v even under 1800A load could be i guess.

It got absolutely wiped out by that Nissan with a 7 second run. But for a 2wd car that really shouldn't be going that wick it would be fun on the street.

I actually like that little trike in the video.

Kurt
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