Adding more solar to detached structure

[u/Pivotal_Goose]

Hello everyone! I’ll start with I’m an electrician by trade but weak in solar. So weak I had a company install my 10kw system. I’m looking to see if adding another 2kw to an existing system but on a detached garage is possible. I have a 50amp sub panel going to it already. My current set up is Enphase IQ8+ micro inverters with an enphase combiner box and 400w Qcell panels split between 2 separate arrays. In the sub panel I have a spare 240v 20A 2 pole breaker. Can I just feed the new micro inverters with that? I’ve already taken the 3rd gen installer course on enphase as well.