In central America, phase 1, phase 2 and neutral with 120 Vac on each line with 60 Hz exists. Does this work with the Any-Grid PSW-H?

It does not work with the 230 Vac models. However, with the 120 Vac models developed for the Americas, this is possible. If you want to use both 230/240 Vac and 120 Vac loads, you will need to have at least 2 inverters. You will connect one inverter between neutral and phase 1 and the other inverter between neutral and phase 2 (split-phase). If you want to use just one inverter you can only work with a 120 Vac inverter and it will be up to you if you connect it to neutral and phase 1 or neutral and phase 2, but you cannot ever connect any Any-Grid PSW-H between phase 1 and phase 2. One of the two conductors must be neutral.