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I am having trouble determining why my Tesla mobile charger is reducing the amps while charging on 120v.

I charge while at work. I work 12 hour shifts and I am using a 120v 15 amp standard outlet. When I plug in the app shows I am charging at 122v 12/12amp and getting 5 mi / hour.

Then a few hours later I check the app and it shows my charging is at 122v 6/6amp 2mi/hr. Why does this happen? It usually goes down to 6/6amp for 4-6 hours a day then later goes back up to 12amps.
Is it temperature related? I have only had this car for 1 month and It’s been hot, 100 degrees most days.

I allow the fan in the car to run while I’m working but no A/C.

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