Running DrPrius for longer battery life

I doubt that is the case whenever gas is over $3/gallon.

Assumption:
250,000 mile battery life with A/C, $2200 battery replacement cost ($0.0088/mile)
150,000 mile battery life without A/C, $2200 battery replacement cost ($0.01467/mile)
AC saves $0.0059/mile in battery cost

45mpg with A/C ($0.111/mile @ $5/gal, $0.0889/mile at $4/gal, $0.06667/mile at $3/gal)
50mpg without A/C ($0.100/mile @ $5/gal, $0.080/mile @ $4/gal, $0.060/mile @ $3/gal)
AC costs $0.011/mile at $5/gal, $0.009/mile at $4/gal, and $0.0067/mile @ $3/gal fuel prices.

 

That would cut into the money I need for a new window regulator.

Just kidding, I'm gonna let it ride though. I've been mentally prepared for HV battery failure since I first saw the temp that high over 3 years ago.

Edit: Another thing worth mentioning is that even at say 123F, my fan is usually on 4. It's rarely on 6 if I'm not using Hybrid Assistant. It seems to be dependent on more than just battery temp alone, but I could be wrong.

 

in my experience, battery temperature takes a lot longer than 10 minutes to reach equilibrium temperature. During a long trip, it keeps creeping up for something on the order of two hours, to a considerably bigger differential vs. interior temperature than your 90°F vs. 40°C (104°F). Then if you're forced to brake repeatedly for traffic, or on a downhill, it will go still higher.

 

123F is no good. Flush the hot air out then open hybrid assistant app, turn the hv fan on and it will go to 6. Turn your ac up to max, make sure the vents are pointed to the middle so the cold air can get to the backseat area so the hv air intake can pull it in. Press the power button so the ac can push colder air. Once the hv battery is 100F, you can back off to eco mode. I now park in the sun 8 hours a day with windows crack and it takes 15 mins to cool my hv battery from 110f to 100f and that’s with the back seats and reat spare covers removed!!! AC kill my mpgs but it delays a $4k battery replacement

 

I've done this many times and on a nice long cruise then I could probably keep the battery around 100F, but that's not how it works out for the majority of my miles. It's baking in the sun, then say 15min drive where I'm trying to hyper-mile. Even with AC blasting and the fan at 6 it's gonna stay at 120F for the whole trip. As Tony points out, I think the math is questionable especially considering I get 8 more mpg and a battery install would be DIY. On top of that, I personally enjoy driving with the windows down.

Anyways, +1 for Hybrid Assistant. It's worth getting an Android device just for that app. You can control the fan, get the battery temp reading, but even more importantly you get engine and MG2 temps on the same screen, which is what Dr. Prius sorely lacks (correct me if I'm wrong). It also works fine in the background.