osi wrote:I could take a break between 2 shifts to give the car a rest and a charge, like work through lunch rush and then go home for 2-4 hours and work later that day.
The car does not need a rest and parking for 2 hours even without charging is not going to cool the battery in our climate. You need to accept that there will be faster battery deterioration in our climate because the average and maximum battery temperatures are much higher here than in cooler areas like the Pacific Northwest.
Yep. Heck, on my '13 Leaf, even 2 hours of sitting in ambient temps much lower than battery temp does virtually nothing. The battery has lots of thermal mass.
Even if I leave my '13 Leaf outside to cool Instead of a warmer garage in say outside air temps of 50 to 55 F and the battery is say at 70 F, the temp might drop by 5-7 F at most after 5-7 hours. Tthese are rough numbers from memory. I'd have to check my notes.
Probably about the only way to get it to cool significantly from blazing hot AZ temps is to drive the car into a freezer or cold storage warehouse and have very powerful fans blowing under the car for an hour to try to bring the temps down. Or, to keep the battery temps down in general, park the car overnight in the above. It'll take some time for the pack to heat up.
Also, spraying large amounts of very cold water (much colder than ambient temp) water upwards into the undercarriage where the battery pack is might help.