An inverter usually has a power rating. Yours doesn't.
100VAC is used in Japan. Can you buy a Japanese transformer?
Here we can buy buy or make inverters. Some have a square-wave output, some have a modified sine-wave output and some have a pure sine-wave output.
Good inverters regulate the output voltage.
Good inverters have overload protection.
Good inverters shut down when the battery voltage becomes too low.
You don't say anything about these important things.