Today did a short chilldown after heavy trip. Battery was
37,7C, 36,3C, 33,7C, Sprayed some water through service hatch (rear seat) for 10 minutes. And 20 minutes later temperatures were:
36,6C, 34,5C, 31,2C. And ambient was 29C. So 2 degrees (in metric) within very short duration.
Water trick does work. Unfortunately, without preparation (piping above the pack) it is hard to get water onto
rear seat cellstack. Hose trick works but it cumbersome. Manual spray from back seat
Also measured wind speed OVER the pack while driving. Yes it is there. And also there is airflow when AC fans are active (1m/s).
Therefore they do help if vehicle is stationary and there is no wind outside. But AC load must be minimal. Either set HEAT on newer
vehicles with heatpump or set fans speed to minimum and recirculation on. This way outside air is hardly warmer than it should be.