Designed for outdoor use or in areas of high moisture. Phase-A-Matic Rotary Phase Converters can run three-phase equipment from a single-phase power source and can take on multiple motor applications. Due to the high in-rush current required to start a motor (5 to 10 times the normal running current), most applications require sizing the HP of the Rotary Converter 50% larger, or more than the horsepower of the largest motor, or any combination of motors started at exactly the same time. The first motor started, if not running heavily loaded, generates additional 3-phase power back into the circuit. You can then run additional motors (not heavily loaded and not all started at the same time). A maximum of up to 3 times the HP rating of the Rotary Converter can run at the same time, if not heavily loaded, and not started simultaneously. For example, a 30 HP Rotary Converter potentially could run motors totaling up to 90 HP. See the "Guidelines for Sizing" sheet in the documentation tab or contact the factory for verification of sizing. All models include a 4-year warranty.