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Speaking to the wire choice: when I ran power to my garage for my L2 charger, it was approximately 75 feet between the existing panel and the new sub panel. I used 10 gauge rated for direct bury. I read a few places that even in conduit it had to be direct bury rated, I forget the industry spec. With 10 gauge I'm good up to 30 amps at 100', it was a compromise, I really should have gone with 8 gauge.
So it really depends how much load you're going to have. Also, my project was diy and it still cost me around $2-300 iirc. It may be cheaper to just keep both services.
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