Unfortunately, the saga continues. As mentioned above, they already installed two Powerwalls stacked together in our garage six months ago. But the permit had expired by then and they used a different disconnect switch, so the installers submitted a revised plan for permit. Apparently, they added three 3'-4' tall bollards (3' deep) to the plan without talking to me about it. On top of that, the revised plan shows two Powerwalls side-by-side, 3' apart from each other and 3' away from Tesla Backup Gateway 2, even though that's not how they are actually installed (plus they already drilled a giant hole on the face of the back Powerwall for stacked configuration).
Regarding bollards - I don't have room for that. Besides, Powerwalls are on the side wall, out of the driving path. Thanks to
this post by
@Vines , I was able to convince the installers to go back to the Oakland Fire Department and get them to agree that they're unnecessary. Fingers crossed. But regarding the 3' requirement, the installers are certain that Oakland FD will
not allow two Powerwalls stacked together inside the garage.
1. Does anyone know if Oakland, CA really requires two Powerwalls to be 3' apart in the garage? (I read this code requirement can be waived for batteries that have passed large-scale UL9540A fire testing, which I assume Powerwalls have, but it's up to the AHJ)
2. Is there any basis for requiring Powerwalls to be 3' away from the Tesla Backup Gateway 2?
3. They said unless Powerwalls are stacked together, they must be at least 1' above the floor. Is this true? (I'm just wary of putting so much weight on the wall).
Thank you.