tbleakne said:
The heat wave is having a substantial impact.
Late PM, Morning
Ambient. 95-100., 68-72
Garage. 82-85. , 72-75
Battery. 88-93. , 79-82
Very modest driving in afternoons raises battery temperature 10+ deg F.
Maintaining differential between garage and ambient is costing 4-10 kWh per day. Trying to keep the battery somewhat cooler by cooling the whole garage is very inefficient, but it still is an interesting experiment. In a few weeks I should be able to see whether this cooling is helping mitigate capacity loss at all or not.
Interesting stuff. Yesterday I completed a 200 mile trip. Used the DCQC for the first time. In fact, I visited 3 different DCQC stations, and one Level 2 station to make the 200 mile trip. Battery temps reached around 109F, and pretty much stayed there for a while. I can definitely confirm it takes forever to cool off! Driving through Woodland hills approached 110F ambient temps. Made sure I didn't stop to charge there! Too bad they did have a hose fitting, where you could just hook up your garden hose to cool off the pack when it is heat saturated. At 109F pack temp, the temp gauge read 7 bars. What are the battery temps others have approached? Is 7 bars, really typical, as far as it being far from the max readings on the temp gauge bars? When it was all said and done, I seemed to have lost over 1% capacity yesterday, even after the battery cooled off. There really seems to have been this downhill spiral with capacity. It usually goes down, and rarely goes up for any significant period of time. I was at 96% capacity just the other month. Now I am at 91%. Will post details of my trip, and all my battery readouts before and after each charge session, during my trek.