I am in the middle of this mess. Started the project in 2019 in unincorporated San Jose.
First the county required me to remove my water softener, so that there was no water near the powerwalls. Then they would not let us mount them in the same location as it was near a door to an outside storage room (no access to the house) and near a window that goes into a closet that is blocked by a built-in closet (shelves, drawers and a rod). We already had approved plans, but that does not seem to matter.
The only location left was the garage, so we put them on the left side and now they are saying we need bollards which will make the garage and/or driveway unusable as you can either put a car in the garage, or in the driveway but not both if the bollards are installed. If they had previously told us about the bollards, we would have put the powerwalls in a different location in the garage.
Based on this experience and the one I had putting solar on my roof in 2009, it seems like the rules change constantly (all of my panels are separately grounded for example) and are partly based on the person doing the inspection.