Optimum battery level for efficiency

[Sooby@sdsu]

I was wondering if anyone figured out if the efficiency (Wh/mile) of model 3 depends on the charge level of the battery (everything else being equal)? I am asking because I track my mileage every month. So far this month I am getting 214 Wh/mile (after driving about 1200 miles). I generally charge my battery to 69%, but last week I changed that to 50%. My mileage improve to 212 Wh/mile (well, insignificant but I have driven only about 200 miles last week).

 

[gaswalla]

Your experience is most likely related to temperature than soc of the battery. See some like as long as regen isn't limited (90 percent or less), efficiency should be equal.
Interesting question

 

[Zoomit]

Or wind. An imperceptible amount of wind could easily cause that difference, if not averaged out over the 200 mi.

 

[ecarfan]

So far this month I am getting 214 Wh/mile (after driving about 1200 miles). I generally charge my battery to 69%, but last week I changed that to 50%. My mileage improve to 212 Wh/mile (well, insignificant but I have driven only about 200 miles last week).

To me that is an insignificant change that is not related to your SOC.

 

[Kirby64]

The optimal battery level is where regen is not limited and power isn't limited. Probably anywhere from 10%->90% assuming temperature isn't an issue. For lower temperatures, a lower battery level (than 90%) is better since regen limitations will creep up faster the higher the SoC.

Anything other than that should have nearly identical efficiency. 2Wh/mi delta is likely because the wind was blowing a different direction on average for your two trips. Or maybe you ate too much. Or maybe the temperature was off by 5 degrees. When you start seeing >10-20Wh/mi deltas then maybe you can draw conclusions. 2Wh/mi is noise.

 

[22522]

I was wondering if anyone figured out if the efficiency (Wh/mile) of model 3 depends on the charge level of the battery (everything else being equal)? I am asking because I track my mileage every month. So far this month I am getting 214 Wh/mile (after driving about 1200 miles). I generally charge my battery to 69%, but last week I changed that to 50%. My mileage improve to 212 Wh/mile (well, insignificant but I have driven only about 200 miles last week).

If you look at charge rates in mph when you use your supercharger, regen efficiency should be better when the battery can easily accept charge.