Last Updated on October 11, 2022 by Rose Morah
If you are wondering why your Tesla is charging slowly at the Supercharger, this article has highlighted some of the main reasons based on our experience and other Tesla owners.
But before we get started, I should point out that there many factors that determine your Tesla charging rate when supercharging.
NOTE: If you are a new Tesla owner, I would recommend that you go through our article on how to maximize range and reduce the battery drain on your Tesla.
Reasons why Tesla is charging slowly at a supercharger
From experience, the following are some of the main things that you need to pay close attention to, in relation to slow charging speeds at a Supercharger:
1. The problem could be the supercharger
Sometimes the problem could be the supercharger and not your Tesla.
But, how do you know if the supercharger is the problem?
- Personally, whenever I plug in my Tesla to charge at a supercharger and get low charging rates, I usually move to another supercharger, and most of the time the charging speed ends up improving significantly.
Therefore, I recommend moving to a different Supercharger to see if the charging rate will improve.
However, if you found the charger unplugged, this is a signal that it is not working -Tesla charger etiquette.
- Go through the reviews on the Plugshare app or other trip planner apps to check whether there are any complaints from other Tesla owners concerning the supercharger.
This will help you figure out if the supercharger is the problem.
This also saves you time because you won’t have to stop at that supercharger.
Sometime back, I never bothered to go through the supercharger reviews when planning my road trips.
But I remember one time on a road trip where I had to stop at Kingman, AZ, for charging, and for the first time, the charging was super slow.
The charging never went above 50kw and I was not even sharing.
So, when I went to check the supercharger reviews on my route planner, I realized that most people had already reported low charging speeds.
See also: Best Tesla Supercharger Trip Planners.
2. It could be a car-related issue
As I mentioned earlier, there are so many factors that determine the charging rate of your Tesla when Supercharging.
Therefore, the following could be some of the factors affecting the charging speeds of your Tesla:
Your Tesla is close to a full charge
One thing that you should know is that, if your Tesla is close to a full charge, it will not charge at a high rate.
When the battery level is low, Tesla will charge at a high rate but slow down once it’s almost full.
Why does the Supercharger slow down?
This is because the car ‘communicates’ with the supercharger. Therefore, it will only request what it needs and only what it can handle.
To test it yourself, I’d recommend stopping at a supercharger with a low charge (say 10%) and comparing the charging rate with when the charge is over 65% and 80%.
You will definitely notice a change in charging speeds.
For instance, my Tesla Model 3 gets about 20kW when it reaches over 85% of the charge.
|Key Take Away|
The charge rate is high when the battery is close to empty.
The charge rate slows down when the battery is almost full.
See also: 10 Smart Long-distance Tesla Road Trip Tips.
Failure to precondition the battery
If you do not precondition the battery before arriving at the charging stop, then this will affect the charging rates at the Supercharger.
What is Tesla battery preconditioning?
In simple terms, preconditioning the battery is a way of ‘telling’ the car that you are heading to a supercharger so that it can warm the battery before arriving at the charger.
You do that in the Climate Control settings.
You may also like: How To Determine The Cost Of A Tesla Road Trip.
You are charging at a power-sharing supercharger. If there is someone charging next to you, this may limit your charging speed.
Excessively hot or cold temperatures affect the charging rates of a Tesla.
For instance, in the winter and hot summer seasons, the battery charge rate will be a bit slower.
3. There could be other issues with your Tesla
If none of the things mentioned here applies, then I recommend contacting Tesla to help solve the issue.
All the best!