I think you may have made a poor choice ofg equipment
(based upon price
?). You’ve got a portable unit, not intended for permanent installation
- and will likely have a “noisy” square wave output.
24 Feet (12' Pos + 12' Neg. ?) at 750 Watt / 12VDC requires minimum #2 AWG Copper (bigger is better, even up to #2/0).
Install a 60 Amp Fuse (Pos) at the Battery
Install a 60A 2Pole (Pos & Neg) Disconnect Switch anywhere convenient to operate, between fuse and unit.