Would there be a way to have the permitted installation not include the battery itself and set up the system for the battery hook-up? Get it approved then after it's closed out, add the battery to the system.DYI battery's with a permit required locations ( most of the US now ) are in the rear view mirror.
Solis 5G and the Goodwe A-ES series are the ONLY high voltage UL9540 certified options I know of. There are other options like Tesla, Enphase and Generac but they are are ALL closed systems, meaning they support only there single battery option from the manufacture of the inverter.
The idea of using a ternary battery ( most repurposed EV modules ) is a huge fire risk, and most UL9540 systems use Lifep04, for sure no one will ever get a permit using EV modules the USA