Recommendations for Adding Battery Storage

I have a grid tied ground mount system that I bought from Wholesale Solar (then Unbound Solar, now owned by Gigawatt Inc.) and owner/builder installed in 2020 and 2022 (added panels). I have a total of 27 panels maxing out my 7.0 sunny boy inverter.

I want to add battery storage. My Sunny Boy is only built for grid tie, so I need a new inverter and batteries. Looking for recommendations on brands, sellers, and battery type.

I could go bigger than 7kw to be able to expand / add more panels later, but can’t go smaller.

Thank you!