Electric conversion: Project ForkenSwiift - Page 50 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

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Old 04-04-2007, 05:44 PM   #491
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Originally Posted by lemmiwinks View Post
A DMM is good for showing you the OCV of the batteries, and if you can juggle it, the voltage under load, but a hydrometer will give you a better indication of the actual condition of a flooded battery.
Good tip, thanks. The book I've been reading "Build Your Own EV" (appropriate to crack it open, now that we're half finished, eh?) sort of pooh-poohs hydrometer use in favour of a DMM, which I took at face value. But I realize in retrospect, they're expecting you to be using a nice set of shiny new batteries.

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A brief note about electric motors (I apologise in advance if you already know this),
No apology needed. Good refresher.

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You might want to consider an ammeter and shunt (I got mine from
http://www.evparts.com
Got one! eBay, NOS. 50 mv shunt with a 600A scale gauge.

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You could use a friend holding a DMM plus the ammeter readings to get an idea of voltage sag under load, and also how much current your batteries can actually deliver to the controller.
Yes - as much as it's useful (and fun!) to drive the car around and do DMM readings immediately afterwards, a proper load test is the way to go.

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(getting a modified car registered here is nothing that bulk $$ can't fix )
Yes, I've read that about both Australia and NZ. What's up with you folks down there? And all the trouble that the little REVA EV stirred up? Wow.

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I especially loved the EV1 rip off at the end, classic
Cool - you're the first one who recognized it! (Or at least said so.)
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Old 04-05-2007, 10:33 AM   #492
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Toecutter: thanks for posting that reply to the speed/performance question in the comments under the Youtube video

I tried 4 different times to reply to that person, but YouTube kept eating my response. It accepted it, said it was posted, but it never appeared on the page. Sometimes YouTube bites.

Also - good to see you get the point in about 130 mph. Got to counter the myth / perception (that I'm contributing to) that EV's are slow and boring!
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Old 04-05-2007, 03:59 PM   #493
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Guess what I bought today
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Old 04-05-2007, 04:15 PM   #494
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Weld me a dream?

Had you ever thought of using motorcycle batteries?
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Old 04-05-2007, 04:17 PM   #495
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Mcycle batteries? To power the car?
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Old 04-05-2007, 04:17 PM   #496
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Yessir.
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Old 04-05-2007, 04:48 PM   #497
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Yessir.
No, hadn't really thought of that. Probably would be difficult because their terminals aren't beefy enough to take the amps we'd be asking from them. Packaging would be easier though...
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Old 04-05-2007, 04:49 PM   #498
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How many amps would that be?
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Old 04-05-2007, 04:54 PM   #499
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Well, the golf cart controller is rated for 225A for 5 minutes @ 36/48v. Then it steps down in increments of 50A I think (it's all heat related).

The forklift controller will handle 400-ish continuous.
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Old 04-05-2007, 04:55 PM   #500
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Hmm, well then. Not quite enough. I remember jared telling me the lawn mower battery he had in his civic was rated for 225~ amps and cost 20~ dollars, besides being light and small.

I'm trying to learn things, since I want to do this to the rex one day. One day...
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