SageBrush
REJECT Fascism
I've read before that Tesla packs have internal resistance in the 30 - 50 mΩ range. Here is a thread for an 100 kWh pack..
So starting from 50 mΩ and 50 kW charging:
Current is 50,000/360 = 140 Amps,
Then resistance losses = 140*140*50/1,000,000 - 0.98 kW
This arithmetic suggests a savings of about a dime per charge if pre-conditioning is avoided. It is actually less, because the higher power curve seen in the beginning of the charging cycle by the pre-conditioned car will result in more resistance losses and therefore less time spinning the motors. This is true because the pre-conditioning only heats up the battery part way.
Pre-conditioning is genius. If the CCS network was not such a tower of Babel, all EVs would have it by now.
So starting from 50 mΩ and 50 kW charging:
Current is 50,000/360 = 140 Amps,
Then resistance losses = 140*140*50/1,000,000 - 0.98 kW
This arithmetic suggests a savings of about a dime per charge if pre-conditioning is avoided. It is actually less, because the higher power curve seen in the beginning of the charging cycle by the pre-conditioned car will result in more resistance losses and therefore less time spinning the motors. This is true because the pre-conditioning only heats up the battery part way.
Pre-conditioning is genius. If the CCS network was not such a tower of Babel, all EVs would have it by now.
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