I drive my Model 3 about 50 miles a day during the week, and a bit less on weekends. I charge my car every night in the garage. At the end of each day I pull into the garage, plug in, and don’t have to think about it again.
The EPA-rated range of a fully charged Model 3 is 310 miles. When charging the Model 3 you can set the car to charge to a specific state of charge (SOC) at any value between 50% and 100%. In this way, the car stops charging when it reaches the % SOC you’ve set. Tesla recommends charging between 50-90% for daily driving – depending on your needs – and to fully charge the car up to 100% when you think you’ll need the range on a longer trip.
I don’t fully charge my car. I set my daily charging level to 60%, which gives me about 185 miles of rated range to start each day. After driving Toyota’s Rav4 EV for 5+ years (113 miles EPA rated range), I know that 185 miles is way more than I need on a typical weekday. And with Tesla’s Supercharging network I know that I can always quickly add more to the pack if I unexpectedly had to head out of town in any direction and needed a bit more range.
Most days I get home in the evening with 135-145 miles in the pack, depending on how far and how fast I drove that day – and a few other variables. The 40-50 miles of rated range that I use on a typical day consumes about 15% of the battery’s full charge. So I’m cycling between ~45% and 60% SOC on a daily basis.
I scheduled the car to start charging at 3AM each night. I am currently using a 240V 30AMP circuit, providing 24 amps or about 5.7 kW, to the car. That stores 23 miles of rated range in the pack each hour. Charging usually takes just 2 hours. In the near future I’ll be installing a 50AMP circuit, but for now 30AMP gets the job done.
I have driven 13,000 miles over the first nine months and charge my Model 3 to 60% on a daily basis. Last month I finally charged my car to 100% to see how many miles of rated range I’d get. The car reached exactly 310 miles. My example shows that charging the Model 3’s lithium ion battery pack to 60% on a daily basis does not affect your ability to fully charge when needed.
So why only charge to 60%? The Model 3 battery pack uses the new 2170 lithium ion cell that is different from the 18650 lithium ion cells that power the Model S and X. But given the amount of data showing Model S/X battery pack durability, I expect the Model 3 battery pack to last a long time. More than 10 years. But I have read up on relevant research, and for longevity the best state of charge for lithium ion cells is close to 50%. I am hoping to get as many years as possible out of my pack, and since the 60% SOC works for me I’ve adopted this approach.
We’ve taken our Model 3 on five road trips, including a recent 1400 mile trip to San Diego. During those trips I set the SOC higher and usually operate between 80% and 30% SOC while driving from one Supercharger to the next.
Summary: Charging to 60% SOC may not work for others, because they may drive more each day, or would like to be prepared in case of unplanned trips, or maybe just prefer seeing over 250 miles of range in the pack each morning. So I don’t recommend that you adopt my approach. But my case shows that if you did adopt this charging strategy your battery pack will be just fine.