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A 1000W inverter will be about 80% efficient and draw 1250W from the battery which is 104A of current from a 12V battery. A car battery might provide 100A at 12V for a minute or two until it explodes or boils away its electrolyte.
You forgot to say if you want a pure sinewave, a squarewave or a modified squarewave output.
Then you can look in Google for a project that might work and uses parts that are not available in your country.
Why do you need an inverter? Are you away from civilization? Then how will you charge the huge battery?
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