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 Post subject: Electric Locost
PostPosted: February 9, 2015, 4:22 am 
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Joined: February 9, 2015, 4:15 am
Posts: 4
Hi Guys
I have been driving my Electric Roadster for nearly a year now
Duncan's Dubious Device
It uses Subaru suspension and a forklift motor


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 Post subject: Re: Electric Locost
PostPosted: February 9, 2015, 10:30 am 
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Joined: October 19, 2010, 11:57 am
Posts: 490
Location: Waterloo, WI
Great! More details and pictures please! :cheers:

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 Post subject: Re: Electric Locost
PostPosted: February 9, 2015, 1:08 pm 
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Joined: January 10, 2008, 4:47 pm
Posts: 7632
Location: Massachusetts
Welcome Mark! Please do provide information, I'm sure there will be interested folks. We may move this to the completed builds section at some point, but on the other hand it's unconventional.

Looks like you've done your own bodywork and folks will like to see your powertrain. Lots of pictures! Thanks for posting.
:cheers:

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Marcus Barrow - Car9 an open design community supported sports car for home builders!
SketchUp collection for LocostUSA: "Dream it, Build it, Drive it!"
Car9 Roadster information - models, drawings, resources etc.


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 Post subject: Re: Electric Locost
PostPosted: February 9, 2015, 1:46 pm 
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Joined: January 1, 2015, 1:55 pm
Posts: 279
I'm interested in learning more. Pretty cool.


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 Post subject: Re: Electric Locost
PostPosted: February 9, 2015, 3:05 pm 
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Joined: May 20, 2014, 8:42 am
Posts: 40
Location: Southern Ontario
Triple Ds always get my attention. I would like to hear and see more about your car


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 Post subject: Re: Electric Locost
PostPosted: February 9, 2015, 5:07 pm 
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Joined: January 14, 2006, 1:06 pm
Posts: 813
Location: Vista (north of San Diego CA)
Great to see electric Locosts. :cheers:

So the questions:
What kind of batteries?
How many batteries?
How far does it go on a charge?
How fast does it go?

I keep thinking if I do another car it will be an electric, but with 40 miles of freeway in the round trip it will be tough to use a Locost form. It seems like there would be too little room for batteries and too much aero drag at 70MPH. Plus, the usable battery capacity drops at those high current draws. Maybe with high tech batteries it would still be doable, but not low cost.

Keep up the good work and post more pictures!

John


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 Post subject: Re: Electric Locost
PostPosted: February 9, 2015, 8:25 pm 
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Always Moore!
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Joined: November 9, 2007, 3:40 pm
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Location: Pittsburgh, PA
Welcome. It looks like a neat project - please post more details.

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 Post subject: Re: Electric Locost
PostPosted: February 10, 2015, 6:10 am 
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Joined: February 9, 2015, 4:15 am
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Post more details?

The Device is a work in progress
Chassis
This is a mild steel sort of space frame bronze welded together
A lot of the open areas have 0.8mm steel riveted and bronzed into them
bronze welding is a very forgiving and very strong (stronger than fusion welding) process
But if I had realized how much it was going to cost I would have bought a MIG!
I'm using the front and rear subframes with suspension from a Subaru Legacy
As the Legacy is struts all round I needed to make the strut mounts part of the chassis
(This explains the ugly front)

Motor
A 10Kw 48v Hitachi DC motor - direct drive to the diff with a propshaft about a foot long
Motor lives where you would expect a gearbox

An electric motor is just a conversion device - the actual power is determined by the batteries and controller

The controller is a "Beta" test unit from "Paul & Sabrina" - it could produce 400Kw!
Currently configured to 1000amps - at my voltage about 100Kw

Batteries
Currently running 160 Headway 16Ah cylindrical cells (lithium)
(now obsolete - I think the replacements are obsolete as well)
arranged as four strings of 40 cells - nominally 130v and 64Ah
This pack weighs ~ 80Kg and gives about 30Km range -
should be more but these cells are not actually 16Ah - more like 12Ah

Total weight - 750Kg - I built it a bit heavy!

Performance
Very rapid initial acceleration - then dies off - I NEEED more volts
We have our annual 1/8th mile drags this sunday
I'm hoping to get down to 10 seconds
Top speed 100Kph (did I say I need more volts?)
Last year with a 500 amp controller I did 14 seconds

I will look out some pictures and post them tomorrow


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 Post subject: Re: Electric Locost
PostPosted: February 13, 2015, 6:07 pm 
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Joined: February 9, 2015, 4:15 am
Posts: 4
Some pictures of the build


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 Post subject: Re: Electric Locost
PostPosted: February 13, 2015, 6:45 pm 
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Joined: October 19, 2010, 11:57 am
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Location: Waterloo, WI
Very interesting. Are those strips of cut up bicycle tubes to isolate the cells from each other? :o

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 Post subject: Re: Electric Locost
PostPosted: February 13, 2015, 8:30 pm 
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Do the batteries get hot in one big block like that? Do you have a fan blowing through the battery box? How long to recharge?

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 Post subject: Re: Electric Locost
PostPosted: February 13, 2015, 9:06 pm 
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Joined: February 9, 2015, 4:15 am
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Hi
Yes those are parts of bike tubes - they give a bit of resilience in clamping the cells together

Battery temperatures
That was the Mk 2 battery

Mk1 had 88 cells arranged as pairs and the series (2P44S) with space to let air around them
They never seemed to heat up so the Mk 2 had 132 cells tripled up and then in series (3P44S) (picture)

Trouble is the cells were not 16Ah - but a good bit less and when one died it killed its two brothers
I am now using the Mk3 - 160 cells four strings of 40 cells

This was not a good idea as at 40S (130v) I am speed limited to 100Kph - with 44S (144v) I never reached the limit (100kph is the speed limit here and the Device is better at low speeds)

These cells are now obsolete

My pack is nominally 16 x4 x 130v = 8.4Kwhrs
In practice I can use about 4Kwhrs - or I will kill a cell

You can buy a really nice charger for $3000
My charger is a basic DIY thing that cost me $150 so it does not charge very fast - takes about 5 hours to recharge


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 Post subject: Re: Electric Locost
PostPosted: February 16, 2015, 4:52 pm 
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Joined: January 14, 2006, 1:06 pm
Posts: 813
Location: Vista (north of San Diego CA)
That is a great project - good job with a custom frame. It looks like you were aiming more for sturdy than light weight so no worries about the 750Kg. Keep us posted on the race results. Good luck!

John


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