Nothing.. My Wife drove the 911 in July and August in traffic every afternoon and at low speeds with no issues. Those two months in Georgia are brutally hot, every day well over 90F.
That was with the A/C running continually.... While running the headlights as well.
Datalogged battery voltage was over 13.6volts all the time..
Battery voltage and charging at low speeds with the A/C on and running headlights was my biggest concern.
It's proven.
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