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Update: The original 6 AWG aluminum wire was replaced with a 6 AWG copper wire and that fixed my charging woes!
Thanks everyone for the productive conversation and help.
Thanks everyone for the productive conversation and help.
I will have to check my wiring as well. The Tesla would randomly downrate to 30A with my Juicebox set to 40A. I noticed the charging plug handle and cord near the charging plug got pretty warm during the charging session; much warmer than when charging at 30A. I've got a a 6 gauge cable making a 50ft run to a 50A breaker. In the meantime, I guess I'll try slowly stepping up the current allowance from the MCU and see at which point it downrates to 30.
Update: the new wire did not permanently fix my charging issues. I continued to have issues and finally was given the gen 2 charging cable which charges at a max of 32A.
You can use 8 AWG copper if it is THHN in conduit. We used it for the second charger. The usual car there has a 32A charger but I have tried with my X at 40A and the voltage drop is fine. If course bigger is better if you don't mind the expense. We already had a conduit run and didn't want to replace it. Did the math and it was fine for the 75C rated connections on both ends.
