OP has a grid conn, and its unlikely this could ever go away (most grids do the "hotel california" thing) ... so, might as well use it as alternate charging source (off-peak rates). OP already knows how to sort thru wiring, so have him call CurrentConnected to ask for all components of an off-grid system to power those items he wants to move off of PG&E. Example would be appropriate schematic from will's "diy solar products & system schematics" link at top menu of this forum.
Start with a small off-grid setup, single AIO & small but expandable battery-bank, and wire parallel to existing AC wiring; this also allows future homeowner to flip back to grid system. start moving loads off of grid and onto separate circuits to off-grid power. charge from grid at off-peak rates. Use system to start learning about solar. Test small like this to see if AHJ or neighbors or other contractors cause any grief.
ground-mount enough panels to support small off-grid setup, and now you are getting off of PG&E, but it's still there for backup, and, if grid is down, you have some loads still running on your off-grid system.
Alternatively, if air con is in heavy use, and represents a major portion of grid bill, investigate a dedicated solar air-con package from SolArk, or build your own, and have a parallel off-grid system providing a/c to the house. This seems to have gotten through many AHJ's, and is another way to get a portion of the load out of the grid's clutches ..
Over time, scale up the size of parallel off-grid components (linked AIO's, more batteries in battery-bank pool, more solar panels). ground-mount, or roof-mount the increasing solar panel array, once you know if AHJ's & such aren't road-blocks.
Hope this helps ...