Let me try to explain what inverters and inverter generators are. We are getting the two confused.
An inverter such as made by Victron takes DC from your battery and "inverts it" to make A/C. There are several types and sizes ranging from small cigarette lighter plug in models to large 3,000 watt models with a built in transfer switch that can power almost everything in the RV.
A conventional generator (non inverter type) operates at a fixed rpm, generally 3,600 to produce 120V A/C at 60 Hz.
Some years ago starting with the ubiquitous Honda EU 2000i, inverter generators came along. They operate at a higher but variable frequency using more armature poles (400 rpm I think) for efficiency. That high frequency A/C is rectified to make DC and the fed to an inverter just like the ones above to make 120V, 60 Hz power.
The advantages are: better efficiency with the higher frequency first step power generation. And the ability to slow the engine down to match the load to the gas or diesel engine output. This lets the engine work at a more efficient lower rpm for light loads but speed up the engine for heavy loads. It is also quieter at partial loads.
So, I think the OP is talking about the RVMP Flex Power inverter generator.
David