How do I tell if charging issues are from the SC or the car?

[snord]

Did the car's first long distance trip using superchargers.

At one of the SC's (150KW max), charge maxed out at 30KW, but fluctuated between 0 and 30KW every 10 seconds. I think I averaged 15kW. Other cars seemed to charge slow but still faster than mine.

On 50% of the other SC's on route, charging never exceeded 50% of the SC's max charge rate. Outdoor temps ~45-55F.

I did get to ~75% max SC charge rate on 2 of 8 chargers.

Are any of these issues something that sounds like a defective on board charger?

 

[jsight]

We need to know the car's state of charge when you were getting 50% of max charge rate. Also were these V3 sites? If they were V2, was there another car next to you?

 

[snord]

At least one of the 50% max charge sessions started with SoC @ mid 20%, 250kW capable station. At least a few others in that category started at 20-30% SoC, most were 150kW capable SC's

 

[Zoomit]

150 kW = V2
250 kW = V3

The onboard charger is only used for AC charging. For DC charging (aka Supercharging), the charger is in the cabinet behind the fences.

Realistically, nothing breaks or fails in the car to make Supercharging slow. If it’s slower than you expect, at a given SOC, then either the battery is cold or the Supercharger stall is shared (V2 only), overheated, or otherwise broken.

 

[pt19713]

Tesla needs to implement a battery temp gauge, either the exact digital value or an analog gauge somewhere in the menu or one of the sub-screens. Even the new Mazda BEV has a battery temp gauge

It'd make some of these questions a bit easier to answer, and it'd help owners get a good gauge (no pun intended) if they are going to be able to achieve higher charging speeds.

 

[Rocky_H]

@pt19713 Agreed. Especially, the car will know if it's one of the two main things:
Limited by state of charge
Limited by battery temperature
If it is either of those two things, the car can display a very simple message to let the owner know that's what's going on. Although, I guess it would always be limited by state of charge in a way.

 

[ucmndd]

At one of the SC's (150KW max), charge maxed out at 30KW, but fluctuated between 0 and 30KW every 10 seconds.

I’ve had this failure mode a few times over the years at v2 chargers. Every time, moving to a new stall fixed it. That’s a busted supercharger.

 

[snord]

I’ve had this failure mode a few times over the years at v2 chargers. Every time, moving to a new stall fixed it. That’s a busted supercharger.

interesting, thanks.