Martin Eberhard former CEO and co-founder of Tesla Motors said on his blog that the ESS coolant pump of his Tesla Roadster runs all the time. It is used to cool the system, but it also seems to be a large drain on the car. Even if the car is stopped, it will consume 14 kW per hour (1,278 kW per year). Eberhard compares this loss to running two large refrigerators. It also translates to the vehicle using 22% from the whole amount of power to keep the coolant pump running.
Just like a software guy, Eberhard said that the problem could be solved once the vehicle’s drive train is upgraded to 1.5 version. What’s next Tesla Vista?
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