I'm going to push back (just a little) on the "cars die quickly in the AZ heat" type statements. I think it's fair to a point, but I think these cars can run just fine in AZ with proper/typical EV habits. I know there's a long list of failures in AZ, but what I haven't seen is how those cars were treated daily for years (scientific method and all). I bought a used 2015 last Nov that had just had a new battery put in (45k miles). It's now 10 months later and I have zero battery degradation still per ODB2 reader (110 SOH). Sure in the extreme heat the GOM claims less battery efficiency, but I'm still getting 90 realistically in the triple digit summer the few times I've driven it to near empty (rarely). I imagine the above statement might be true with bad charging/managing/driving habits compounding over time. But below are the rules I follow and I think they're the key to keeping it working well in AZ. Some of them are also just standard best practice EV rules.
[*]It sits outside in the heat (no garage room), but is always plugged into L2 with rare exception. This kicks on the venting fan regularly to get some heat out. I still recommend storing it under cover/in a garage if you can.
[*]Having it plugged in regularly also allows me to auto-condition the car in the hotter parts of the day. This kicks on the AC which in turn sends that cool (or warm in winter) air down into the battery cavity as designed (it's scheduled twice daily, I don't use it in the morning I can manually do that).
[*]I only charge to 80% unless I know I have a lot of driving to do the next day.
[*]I've only used the L3 charging twice, just to see how it works and as a test. No
EV is meant to be charged via L3 constantly.
[*]I don't go 80 on the freeway all day, this car isn't optimized for that. I just do the speed limit and go over if I need to. I know one of the guys with a failed battery claimed he went 80+ on the freeway all the time, which probably cooked it. I did it once to test the temps via ODB2 and man did it get hot!
[*]I think I've only ever had it get below 20% maybe three times. I just don't usually need to drive it that much per day.
Now fair enough that might seem like a laundry list, but it's all in the recommended list from Kia. And some may say well I don't want to do those things. Fair enough, get a different car and have what you need for your lifestyle. But for those that know the Kia Soul EV is awesome and want it, you can make it work if you can follow the best practice list. I have two Tesla's and still enjoy the Soul for some weird reason. I think it's the upright seating, Android Auto, and cargo space.