Battery Temperatures & Reliability

Shade does help. I've seen inverter coolant in the low 130's. Expect OAT + 20F.

 

you definitely want the a/c on, and recirq. make sure your vent grille and fan are clean, and the outlet louvers.

 

I drive in 90-100 degree weather with the windows down no a/c. My commute is 12 miles. The battery fan rarely comes on and I check it frequently. Not sure what the temp is but its not high enough to trigger the fan. I do have excellent ceramic tint and don't open the windows on the sunny side of the car.


iPhone ?

 

My A/C is pretty much on every time I drive, summer or winter......

 

Take a look.

FWIW, parked after a drive is when I see highest temps. Usage raises the temp, then sitting, fan off, hot weather in particular, seems bad. Highest I've seen is maybe 46C. In regular use more like 35C~38C.

Also, I'm thinking the theory that AC cooling of the cabin will keep the battery temp down is urban legend: monitoring battery temp, starting with no AC, then switching it on and running for say 1/2 hour, I see no temp drop.

 

that's interesting, i wonder why cooler air doesn't reduce the temp?

maybe it would if the battery was hotter and the fan speed higher?
Merged."...

probably not. don't think i've heard of a clog without pets.

 

well, there has to be a reason, otherwise toyota would save the money on the fan and ductwork.
Merged......
heat is not okay, but the system is designed to provide longevity even with some heat.

if your question is, how much is too much? you may have surpassed the combined brainpower of these forums.

i think all we really know is, the less the better. but cold isn't good either. there's a comfort range.

 

How are you controlling battery fan speed/power?

 

I don't think he's controlling fan speed with ScanGauge, just monitoring it. I could be wrong, lol.

 

I hated scan gauge, I used to have an ultra gauge and loved it but it was stolen when my xB was vandalized. I'm using a bluetooth code reader now.

SM-N910T ?

 

Oh, found a more appropriate thread for my issue here. Definitely getting myself an OBD2 scanner now to monitor the batt temp since I started hearing the fan for the first time on this hot summer day (I was also idling for nearly an hour waiting for somebody at a doctor appointment, the longest time I've sat idle in the vehicle).

 

Scangauge out of the box won't show either fan speed or battery temp. But Xgauge programs can be entered to add those If and when you need info, just ask. There's a YouTube video explaining the (not that intuitive) data entry, and there's a massive spreadsheet listing all or most of the xgauges.

 

Figures, but I'm planning on using an Android app with the aforementioned ODB2 adapter to observe these parameters. Perhaps I'll be settling for less functionality than I hoped. Would be open to recommendations on the best app for this purpose.

 

You may not have seen a temp drop, but isn't it possible that the temp would have risen further if the AC was not switched on?