What city do you live in? The answer as to whether the particular jurisdiction accepts the testing is location dependent. For instance, San Jose has no issues, while Santa Clara County has huge issues. Those issues have spilled over to many other smaller jurisdictions as time has gone on.
I am in Half Moon Bay, which is in San Mateo county.
I have spoken with a very nice deputy fire marshal with San Mateo County Fire (who was familiar battery installs, and performs inspections) but, turns out, only for unincorporated parts of Half Moon Bay. Where I live, within city limits, things are up to City Hall and the Coastside Fire Prevention District.
Tesla tells me, in Half Moon Bay, I need 3' of separation between between PW and must have either a heat alarm OR sprinkler system. There is no sprinkler requirement per the latest 2022 CFC (which city hall has confirmed HMB has adopted), so I'm not sure where Tesla is getting the sprinkler "option" from.
I've had a tough time corroborating with my AHJ anything Tesla is telling me about the requirements for my install. City hall is farming me out to some 3rd-party administrative contractor working for their building department (who literally just started last week) and the last time I contacted Coastside Fire, they put me in touch with San Mateo County Fire and the nice deputy fire marshal, who turned out to be the wrong authority to speak to.
For example, Tesla told me that HMB allows stacking, but HMB (well, the contractor) told me that stacking is not allowed. I took me a little while to get the contractor to do the legwork to confirm that HMB had adopted the 2022 CFC, and was not still subject to the 2019 CFC, which is what their (outdated) website said. (I had wondered if Tesla was simply getting their information from the outdated website rather than actually asking the city.)
That all said, assuming Tesla is correct about the heat alarm option (seems likely, because that matches the 2022 CFC), I would like to pursue it (seems way cheaper than sprinklers), but the other issue I've run across is that there is apparently "no acceptable product in the marketplace"? (Anybody know about that?)
Anyway, back to UL 9450A, I would also like to have my PW mounted in reasonably close proximity to each other if at all possible (I am getting four, and that is a lot of wall space with no stacking and 3' of separation), but I have no idea if city hall knows about the test report. Hence, me wanting to find it myself so I could at least attempt to point it out to them.