Hello, friend.
In inverter cascading scenarios, both the master and slave inverters can be SUN2000-(2KTL-6KTL)-L1, and a maximum of three inverters can be cascaded.
The rated output power of the SUN2000-3KTL-L1:3000 W
The rated output power of the SUN2000-5KTL-L1:5000 W
For details, see section "Technical Parameters" in SUN2000-(2KTL-6KTL)-L1 User Manual.