A "Solar Generator" is properly called a portable power station. It consists of a battery pack, an inverter, a 12V converter/regulator, and a solar charge controller(usually mppt). They are simply a self contained system when paired with solar panels. It's not a gimmick, and they come in all sizes, up to and including models that have 5000-7000 watt inverters, even split phase 240 volts. You can power a whole house with one of those. Two of the top makers are Bluetti and Ecoflow. I have a Bluetti AC200L, which has a 2 killowatt battery and a 2400 watt inverter. It will run my microwave and my 13.5K AC. It will accept 1200 watts of solar, I power mine with 4 320 watt folding panels. It is no joke. I do have my honda 2200 for cloudy days, and when needed. I also have 200 watts solar on the trailer, and an additional 400 watts folding when necessary.