I have had some issues with breakers as well. Here's what I learned.
A 48V breaker may still trip when you charge your batteries to full. As it's closer to 55v and exceeds the design of the breaker. Mine kept tripping. So I got myself a "t-class" fuse. Seems it's more designed for inverter applications.
I have yet to install it but I hope it solves my breaker problems.
I don't want to mess with my system when it's under warranty. They have installed a lot of systems, so you would think they would know about such issues. I've let them know it failed again.
I hope you can resolve your issue.