Sinusoidal converter with a 230V/50Hz socket and USB output for charging mobile devices. It is suitable for powering all kinds of appliances with resistive load as well as appliances with inductive load such as motors, pumps, refrigerators, fluorescent lamps, etc. It is also suitable for reliable and safe powering of televisions, computers, printers, measuring instruments, and other electrical appliances with sensitive electronics. Available in versions for 12V batteries, or multiple interconnected batteries with a total voltage of 24V or 48V.