Reasonable price single phase 4000 watt on grid solar inverter is a compact unit, creative MPPT tech makes efficiency higher than 99%. It directly converts direct current 150-500V MPPT voltage range into alternating current 230V (190-270) for grid tied solar power system, please concact us for other output voltages.
Tips: How does the on-grid inverter work?
Simply the inverter has a computer module that senses the grid AC voltage waveform and continuously measures all its parameters instantly like the voltage, frequency…etc. and then starts to inject the AC current, so that the inverter keeps its output voltage to be slightly higher than grid voltage all the time. At the same time, the inverter must have anti islanding feature which quickly disconnects it if the grid power system shuts down for any reason, to protect itself from feeding uncontrollable loads "may be higher capacity" and protect personnel who were sent to troubleshot the power grid.
Single-phase Grid Tie Inverter Installation Guide
Single-phase Grid Tie Inverter User Manual