Safe ways of powering keyboards away from the 230v mains

[P30Technics]

I've been asked to play piano (Technics 10v/1amp adapter) on a boat . There is no mains or low voltage supply.I am thinking of using a car battery linked to a 12v/230v inverter connected to the Technics adapter feeding the piano.

I'll be grateful for feedback, warnings and better suggestions.......and I thank you for reading this.