The AN-WSPI series is Anern’s low-frequency solar inverter with capacity ranging from 500W-1500W. The reason why the low-frequency inverter is called a power frequency inverter, its internal transformer and rectifier are 50HZ power frequency. This series is designed with a low-frequency circuit. Providing quality solar energy equipment, Anern can customize suitable 500W/700W/1000W/1200W/1500W solar inverters with low-frequency for you.