TMDSHV1PHINVKIT: what is the Maximum output power of this inverter?

Part Number:TMDSHV1PHINVKIT

Hello

I have confused with this broad ratings.

I have seen that this is 600W inverter, but in the testing part, there we have to connect 1000W load.

What is the maximum load this inverter can handle?

According to IGBT datasheets, this could handle over 1000 W.  so this inverter should capable of handling more than 1000W.

I am going to modify this inverter inot 6 kW one. so what I am going to do is change gate drivers and mosfets, will it work?

Please help me.

Thanks