I created a new integration for a NeoVolta NV14 solar battery. It’s in the process of being added to HACS. The code is at GitHub - austinmroczek/neovolta: NeoVolta integration for Home Assistant if you want to drop it in your custom_components folder to try it out.
It is a work in progress and will have some bugs. I am still figuring out which values read from the battery correspond to values I can see in the provided “Solarman” app. If anyone else has a NeoVolta battery and would like to help, please let me know.