We don't send schematics to people.
We help them with a circuit they have designed themselves or a circuit they have found.
You forgot to say what wave-shape your inverter must have.
A square-wave output is made by a simple circuit but many electronic items won't work from its square-wave.
A modified sine-wave is better but its circuit is more complicated.
A sine-wave is excellent but its circuit is very complicated.
When an efficient inverter has a 1.5kW output then the 12V battery current is about 150A. One huge car battery will soon boil.
A 1.5kW transformer will be overloaded so a 1.8kW transformer must be used.
You won't be able to by a 1.8kw transformer anywhere so it must be custom made and will be extremely expensive.
Buy an inexpensive Chinese-made inverter or use an engine-powered generator.