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Electric supply for charger

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I expect delivery of my LRY early next year. I am looking at wiring options for the Tesla wall charger in the garage. My main incoming breaker is 200 amps, however I do not have space in the panel for a 60 amp breaker. I have 2 sub panels, both supplied via 60 amp breakers. One panel has the space to install additional breakers. My question is - can I change the sub panel breaker in the main panel to 90 amps (I have AL type se style r type xhhw 600 3 cdrs 2 awg cable servicing this panel) and then install a 60 amp breaker in the sub panel for the charger?
 
It doesn't NEED to have a 60A breaker. The wall connector is a variable power device with different settings. It can use circuits from 15A up to 60A. So just check what you can fit, and if you can get a 40 or 50A circuit, then that's fine. The wall connector can be configured for that, and that's still a great charging speed.
 
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I do not have space in the panel for a 60 amp breaker.
I assume you mean you do not have room for any 2-pole breaker, irrespective of amperage?
I have 2 sub panels, both supplied via 60 amp breakers. One panel has the space to install additional breakers. My question is - can I change the sub panel breaker in the main panel to 90 amps

You really need to get an electrician in to have a look, with a main panel and 2 sub panels you may be close to overloading your system as is. And as @Rocky_H noted, if you are load limited you do not have to install a 60-amp breaker,
 
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For all the other non-techy folks installing the Tesla wall charger. I have two in different residences. If the code has CAPITAL LETTERS, USE CAPITAL LETTERS. Two months of frustration with one charger while the other one initialized immediately.
 
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