I recently came across a fairly old car inverter. It plugs into a 12v DC lighter socket, and outputs 115 Vac at 60 Hz, and has a normal American outlet on the side of it (with a ground pin, which seems questionable) and is rated for 100W continuous or 150W peak. This tool could be very useful to me, mainly to run a laptop in the car (when someone else is driving, of course). The output is also non-sinusoidal, but, as far as I understand, that does not matter for switch mode power supplies, and all of the things that I want to power in the car run on switch mode power supplies.
More concerningly, however, it says "NEUTRAL FLOATING." My understanding of electrical engineering tells me that this means that the neutral wire isn't attached to anything, except maybe a capacitor. This may still work with lower current loads (perhaps up to 100W based on the labeling, although that seems high) due to the capacitance on the neutral wire, but it would also cause the device that I am using to start floating above 0V on its neutral or ground side, a dangerous situation. It seems, however, that such a dangerous device would not be legal to sell in the United States, where I am pretty sure that this was bought (it is very old, so I don't know exactly).
As such, it seems like I am misunderstanding what "NEUTRAL FLOATING" means. What does it actually mean? Is it safe to use my inverter, or do I need to buy another one?