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writer has question about battery SOC/recharge

4260 Views 5 Replies 4 Participants Last post by  nlh_90210
I'm writing an article about the Volt. I need a technically correct/sourced answer to a question. In a posting on this site from August '07 (NEW FACT: Volt generator starts when power hits 50%, stops again at 80%) it confirms that the generator (when running) will recharge the batteries to 80%. That means that only 20% of the charge will be available for recharging during the pug-in mode. This seems substantially less than is usually intimated. I understand this would only happen during usage cycles when the generator kicks in, but can someone either confirm this, or provide updated info?

Also, the actual electric energy consumption info I have found on this site states .3kwh/mile. This is the same as I have found stated for the Tesla Roadster, which is a much smaller vehicle with a substantially lower frontal area (drag). I am a bit skeptical about this claim for the Volt. If it's not true, range will be substantialy affected. Any comments?
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bang bang

I think the best analogy for how I expect the ICE in operation is like a heater. When the charge gets to the lower set point the ICE turns on, when it get to the upper set point it turns off, much like a thermostat. That way you can run the ICE at a constant rpm, with a constant torque to the generator. That way the ICE can be optimized for fuel efficiency at those two parameters. I'd be very surprised if they made anything more complex than that. Think of the ICE as an electric generator instead of a motor.

In general I would not quote any of us, especially if you are writing an article. All of this is speculation.
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