+1 on that! 
instead of getting rid of the 3kva …Can one install a 3kva and a 5kva inverter together?
Not in parallel, no. Units have to be identical.
And what Plonkster means here is actually buy them at the same time, as in that identical… Not a year apart, as even different production runs have minor differences that causes “unknown gremlins”
G
Well, if you know what you are doing and you understand what might be needed to add a little bit of extra resistance (ie cable length) to the one side, I would not exactly call them “unknown”. But that’s why paralleling is a task best left to an experienced installer, because to the average sparkie this stuff is often dark voodoo, and the best way to avoid weird issues is to… well… avoid them from the start.
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