in my experience that's not normally something that's on by default or even universally supported, generally the inverter is continuously outputting.
But that is definitely a fairly common option.
Usually goes under the name of power save or search mode, something along those lines.
especially on the large low frequency transformer style of inverter because their idle current is so high.
I think it's less common in the high frequency style of inverter because their idle current can be very low.
As far as what it actually is, usually it would be one or two complete cycles of AC, and they could be sent every 1 to 10 seconds depending on the inverter.
The nicer ones are configurable as to how often they should search for a load and what the minimum load should be.
I'm no expert, but I have installed a handful of low frequency and high frequency inverters with and without that option.
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