Tsiah wrote:I put 250 miles on the car one day last year and had 2 short QCs... The battery was 124*F and even after cooling off overnight was still 80*F in the morning. How would a TMS reduce reliability? Have you heard a single TMS issue with Chevy EVs? Tesla? Fiat? BMW? How about early battery degradation with their cars?
You live in Salt Lake City, about 10 C warmer than Seattle, and about 4 C warmer than Denver in July.
On the day that you drove 250 miles, your battery was about 6 C warmer than where a Tesla would start to cool the battery (45 C). That means you lost almost a day more battery life that day than you would have with a Tesla style TMS. Do that 3 times a year for 10 years, and your battery will get to 70% almost a whole month earlier.
Honda Fit EV doesn't have battery cooling, and has done well. Ford Focus Electric has done about as well as the LEAF, and has an extensive battery cooling system, and no DCQC capability.
Battery chemistry is complex. TMS sounds simple.
Like the old joke of a drunk looking for his lost keys under the street light. Not close where he lost them, but the light was better.
Tsiah wrote:but it's still a shitty idea to not have TMS.
A TMS would never turn on for me. Why should I want one? A TMS isn't the difference that many seem to think it is. Most of the time, in most of the cars, failure of the battery cooling system wouldn't be noticeable as it would never attempt to turn on. Why should I pay to have one?