I have a 55 amp charger set at 14.4 volts intended to run off a Costco 2000 inverter generator. My idea was to supplement my existing batteries and existing 3kw inverter. I do not yet have solar on the trailer, but when I do the plan is to do similar to you - except with double conversion VS sync AC like you. Your syncing to the generator makes you somewhere in the 30% more efficient. You already have 600 watts of solar, which can easily make up for the generators shortfall on the cycling AC, and likely support most of the other loads when it is not. While the cost of the inverter is steep VS the cheapies, you already have everything else installed and operating - I would consider this project more of a way to add 12-14 hundred watts of solar without the roof real-estate when loads require it VS how to make solar back up an undersized generator.
