Saturday, November 25, 2006

Battery choices, narrowed it down


So, been researching batteries lately, and though I'd love Lithium, it's just way too expensive! So I'm settling for a Deka Intimidator D34. It'll weigh 1063 pounds, but I think I can get that to work, if not, I can always remove 2 or 3 cells.

I used the above spreadsheet to calculate and estimate range/cost/weight, etc. Click the image to view a bigger version. Original spreadsheet here.

Thursday, November 23, 2006

Something I read posted online

"We had the better batteries 10 years ago. The Ovonic NiMH. 70 wh/kg specific capacity, 1,750 cycles to 100% depth of discharge. Robert Stemple, chairman of Energy Conversion Devices, quoted them at $150/kWh for a production run of 20,000 cars.
General Motors, not wishing to see the electric car go mainstream, sold the patent to Chevron Texaco. Chevron Texaco vigourously protects this battery and has sued Toyota for making a similar design. Further, with the oil company winning that case, it can now restrict the maximum AH size of the batteries to 10 AH. This prevents them from ever being used in a road EV, as it is not practical to go above 400V or so and NiMH cannot be charged in parallel with ease. Further, this oil company is responsible for about half of the price premiums on Today's hybrids; they charge $1,200/kWh for the battery when it could be much cheaper!
At 70 wh/kg, a midsize car with attention to aerodynamics could have 200+ miles highway range with a 500 kg, 36 kWh pack costing $5,600 and lasting well in excess of 300,000 miles in theory. This battery has been denied to us. This battery would allow hobbyists to make 120-150 mile range conversions a norm, and 200-300 mile range conversions a possibility."

Not sure how accurate the numbers are, but the fact is that we can't get a technology that works because of this. Companies are allowed to protect their revenue stream, but this sure makes Chevron and GM look bad.

Wednesday, November 22, 2006

Waiting for Motor, Inverter to arrive!


I've ordered a MES-DEA system, 30kW continuous, 90kW max power (about 100hp+ or so).

Waiting for it to arrive, wish it wouldn't take so long. :) I feel like a kid waiting for a toy to arrive. Trying to come up with the battery system now in the meantime.

Been reading up on EV conversions, and the pro's and con's (look at FAQ #6) of auto versus manual transmission, and I've decided to stick with a manual, but without a clutch. Supposedly you don't need a clutch? I'm still not quit sure how it all works, though, so I'm going to keep the clutch and clutch pedal and just not use it. Going to remove the flywheel for reducing rotational mass, which I think is ok.

Added the car to evalbum.