In the US households receive single phase power at 220-240vAC rms. To get the 110-120vAC rms power, the power is split in half. Hot to hot is the 220v. Hot to neutral is110v. Inverters can put out a wide range of voltages. 110, 220, or above. Years ago the micro grid tie inverters out putted 110v. KI6ZQY