i am in the same boat, no main panel upgrade at all but tesla cancelled my project. I have 90amp and 40 amp breakers on my main panel, tesla was planing to build a new subpanel and connecting to 90amp but they cancelled the installation 3 days before the date saying my main box is 30inch away from gas pipe, even if they touch to thepanel without a change pge will not accept. I am also very disappointed, how did you overcome your issue?
I am planning to cancel my contract with tesla and do with another company
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Man, your situation looks pretty hairy since it seems you actually need an upgraded (higher rated amperage) main service panel?
I posted on the first page of this thread a mega-long explanation of how I overcame the issue. My original main service panel was a 200A rated panel that was being replaced with a new 200A rated panel. My installer applied for a new permit that was a pure stand-alone main panel replacement. This prevents PG&E from saying solar was making the install "unsafe." And once a new main service panel was installed that had a beefy busbar, they installed solar (well outside of the 36 inch bad-zone) and battery stuff.
I think, you'll need to find a local installer that will make sure their designed system can use a main service panel of the same amperage rating as your old one so you can do the "like for like" replacement within the 36" bad-zone.
If you end up going with Sunrun anywhere near East Bay Walnut Creek, CA... let me know your order details and I'll ping the main operations guy of Sunrun's local branch. He is now familiar with the bifurcated permitting/process to get your system in under the like-for-like.
If you end up going with @Vines, then he'll get you sorted with no sweat on your end lol.