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Interview With Elon Musk On Tesla Model S Performance In Cold Weather

Ovidiu Sandru of The Green Optimistic recently conducted an email interview with Tesla Motors Founder and CEO Elon Musk regarding the Tesla Model S and how it performs in cold weather. Reposted from The Green Optimistic, here’s a compiled summary of the interview:
Read more at http://cleantechnica.com/2013/03/01/interview-with-elon-musk-on-tesla-model-s-performance-in-cold-weather/#fAKMIC3qVzo6xsdq.99

elon-muskOvidiu: How does the Model S manage cold weather? As far as I know, the Roadster had auxiliary battery heating systems and for sure the Model S has them, too.

Elon: The rough answer is that range drops about 10% in the sort of weather seen during the NYT test drive, but this is primarily due to energy being directed towards cabin heating.

Ovidiu: What is the energy spent (per hour) to warm up the batteries to the chosen temperature, even in subzero conditions?

Elon: The battery actually loses very little energy when cold. Keeping batteries cold is actually the best way to preserve them! It only loses energy when keeping the pack warm for the convenience of the driver — so you don’t have to wait long to drive.

Ovidiu: Is this an active system that prevents battery failure due to extremely low temperatures, even if the car is not being used?

Elon: Once you start driving the liquid thermal loop transfers heat from the motor, gearbox and inverter to the battery pack, so not much incremental energy is needed at that point. We also close the radiator louvers at the front of the car (which has the dual benefit of lowering drag) and close the valve leading to the radiators, so the liquid loop doesn’t reject energy to the environment.
More cleantechnica.com

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