Taking too long? Close loading screen.

Selecting the Right Battery Size

battery pack
The Easy Choices

Pick the smallest battery if your budget is already pushed to the limit for the base car.

Pick the largest battery if the cost is unimportant to you.

Pick the largest battery if the best performance is important to you. Performance models do have a little less range than non-performance models with the same size battery.

The Practical Choices

For most of us, we have a budget and want to know which battery fits our needs best without breaking the bank.  Like ICE cars, there is some degradation over time. While an ICE car’s range and efficiency deteriorates slowly over its life, a Tesla has a little degradation of the battery in the first 60K miles, then very little beyond that.

Below we show every Tesla model, along with the expected average battery degradation over time.

Current Cars

ModelSub ModelEPA, new60K miles*120K miles*
S75D259245243
S100D335317315
SP100D315298296
X75D236223222
X100D295279277
XP100D289273272
3Standard220208207
3Medium-Range260246244
3Long-Range310293291

 

Discontinued Cars (used market or CPOs)

ModelSub ModelEPA, new60K miles*120K miles*
S40139131131
S60210199197
S60D218206205
S70230218216
S70D240227226
S75249236234
S85265251249
S85D272257256
SP85265251249
SP85D253239238
S90D294278276
SP90D270255254
X60D200189188
X70D220208207
X90D257243242
XP90D250237235

* Degradation averages 5.4% at 60K miles, and 6% at 120K miles on S/X. Reported by owners as of Oct-2017.  Model 3 uses a different battery, so the degradation may differ. We suspect degradation will be less than the S/X.

Figuring the Range Needed

What range do you really need? First, we assume you hare home charging. If not, that adds some complications as you need figure out where and how often you plan charge. At home, you should be able to fully charge each night. While you can charge to 100% anytime, note that Tesla recommends a 90% charge to improve battery longevity unless you need it for longer trips. You shouldn’t worry much about this, and use 100% whenever you need to.

Step through each of these scenarios and check what range is necessary:

  • Home charging, getting to work and back. Add some miles for typical side trips such as lunch and grocery shopping.
  • Longer trips you take to family or friends. Check if you charge at your destination or perhaps at Superchargers along the way. Only note the longest segment – such as from your home to the first Supercharger.
  • Vacations – Do you fly or drive? If driving, figure out the typical distances and stops you may need to take at Superchargers. If you need extreme range (driving outside the Supercharger network for long periods), would a 2nd car you own be a better solution? If so, ignore that long trip for EV distance.  Also consider how frequent you take a long vacation. You may find it cheaper to rent a car for that rare trip, than buy a larger battery than you’ll never need for the rest of the year.
Range adjustment

Some adjustment may be necessary if you travel at very high speeds for long distances, drive in cold or hot weather, or have the larger wheels (which are not as efficient).  The EPA numbers are roughly based on travel at an average speed of 65 mph on a flat level surface without headwinds and 70 degrees outside.

Conclusions

It may seem overly complicated, but there is really no bad choices, and plenty of good choices. Many owners are happy with the smallest battery in the 200+ mile range. Only you can access which battery is best for you and meets your needs.

Leave a Reply