The price list of three phase frequency inverter is in the table below, if you want to know more information, please go to our product's page. Price and other details may vary based on product size and color. Bonvoisin Single Phase to 3 Phase Converter 20HP (15kW) Digital Phase Shifter, 70A 220V-240V Input/Output, One Converter only for one Motor. The frequency is directly related to the rotary speed of the motor, in other. . Only 1 left! Get the best deals on 3 Phase Inverters when you shop the largest online selection at eBay. Free shipping on many items | Browse your favorite brands | affordable prices. These inverters help control motor speed, improve energy efficiency, and provide protection features. This guide provides insights into the factors that influence prices and offers a clear perspective to potential buyers.