Can I combine PW2 with a different battery/solar system?

[Cheburashka]

I have an existing SolarEdge system with a LG RESU battery. I have a separate critical loads panel that is backed up by the battery.

Can I install a Tesla PW and have it back up the other sub panel in my house? Or does it need to be tied in with my existing solar system?

 

[jjrandorin]

I havent heard of someone mixing home battery storage vendors like that. No idea from a technical level though.