Regarding how much the road temp affects the bottom of the battery "when parked for an extended time" which blocks the sun from hitting the road surface since my home carport is not really big enough to park two cars without squeezing them really close to each other which them prevents us from using the carport for some other things also, I always park one EV in the street using a silver-colored car cover. Now I know it would be best to always park an EV in the shade to minimize battery heat which will minimize long term battery capacity fade, but parking both EVs in the carport is simply a no-go for us. And unfortunately no shade tress or nearby building to offer some shade. Anyway, a few minutes ago at 2pm with a partly cloudy sky (but mostly blue sky) and ambient temp 34C I used my IR temp gun to measure the temperature directly under the road-parked EV on the battery bottom surface, then flipped the IR temp gun 180 degrees to measure the temperature on the white concrete road surface directly below that battery point, and then the concrete surface about a half meter away from the EV. The EV has approximately a 160mm road clearance. Temps I got were: 37C on the battery....also 37C on the concrete road surface directly below that point point...and 51C on the concrete away from the EV. So, a 14C difference with no to little moving air except whatever very light breeze that was blowing. Now the BYD app was showing a cabin temp of 46C. So, with a cabin temp of 46C radiating on the top of the battery and the bottom of the battery showing 37C, maybe if I could measure the actual internal temperature of the battery (but I can't since my OBD dongle/software can't read most Sealion OBD data like battery temp) the battery temp would be approximately an average of the two...maybe around 42C being parked on the road with car cover. But my gut tells me it would be closer to the bottom battery temp of 37C. Ah heck, I'll guess the battery internal temp was probably around 40C. Now to stress I'm talking an EV that has been "parked for an extended time (like parked 24 hours a day)" providing shade to the road surface which in turn lowers the road surface temp significantly belo the road surface exposed to the sun. Just FYI for those who must park their EV outside in the sun and maybe you were wondering what temp on the battery might be compared to the road surface exposed to the sun. Well, don't worry, it's not nearly as hot as the concrete/asphalt road surface....especially an asphalt road surface which is black and really gets hot....significantly hotter than a white-gray concrete surface.
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