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Originally Posted by freebeard
.. so I calculate less than 1200 as it sits.
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Wow - nice and light!
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With the Beetle, I'd like the primary battery pack to replace the rear seat, with a secondary pack in front replacing the gas tank sized for front/rear weight balance. And an option to plug-in an additional battery where the engine used to reside, or in a trailer, to extend the range. Minimum range would be a 3 mile track plus return road. There's always a wait in line between runs.
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3 miles is pretty low. I would expect multiple runs on a charge.
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I'm assuming a DC-DC inversion, for instance a 1st/2nd gen Prius battery at 288 volts bumped to 650.
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Good - that makes fewer cells and less space. BUT it likely means lower amps for your race, which would then be a slower time.
Yes - that pack would likely give you a range of 100 miles in normal driving. Batteries cost a lot. But the 400A would be nice at 650V for your racing.
At 288V you would need 90 cells. That's still $5400 plus straps.
The racing setups I have read about (I have not seen any in person) use smaller capacity cells like A123 pouch cells (20 ah, 20C max discharge) to get a lot of power in a short time with a limited range. That does not work so well with a multi-function vehicle.
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Edit: used+Prius+battery+pack into Google returns pricing in the range $1760-2628, with one site offering "...from $850". So that's my default choice. Dimensions are 15 x 40 x 9 in. I can't measure the back seat width right now but it's 42" at the rear window. So I could stack two or three there.
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Using 288V instead of 650V gives you a lot more choices.
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What's a headway cell? There is an access plate at the front of the center tunnel that's about 1 1/2x3". If I could slide 6ft long sticks in there in pairs it might hold six.That would be 92 cells right below center of gravity. That might present cooling problems though.
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Headway is just a brand name. Like Panasonic or CALB. Headway are used more in the RC helicopters and scooters. They are a cylindrical cell, like a extra-large D cell .. at least that's the type I've seen pictures of.
6 feet of cells, 38 mm (1.5 inch) in diameter, screwed together (they apparently have threaded holes in each end) would give you 13 in a stick * 3.2V = 41.6V. 288V would need 7 sticks.
Figuring out which cells you can use to make good use of your available space, get the voltage output you want, and be economical, is a challenge ... you will likely have some trade-offs.