The only inverters I've ever used are the cigarette lighter types. Im sure those won't work at all. Maybe there is some kind of super inverter out there capable of pushing 1000watts, but I'm unaware of it. If there is, it's probably more expensive than a 1000watt generator. If I remember correctly;
If you need 1000 watts off of 12 Volts, you'd be running like 83 AMPS. Not gonna happen.