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The SP-30 is a high-capacity single-phase to three-phase rotary phase converter designed for serious workshop and light industrial environments running large single-motor equipment. It delivers stable, dependable three-phase power from a standard single-phase electrical supply, without stepping into full industrial rotary systems.
If you’re operating a large three-phase machine in the 15 to 20 HP range and need strong starting performance with consistent operation under load, the SP-30 is built to handle that level of demand.
The SP-30 supports a single motor start horsepower of up to 20 HP, making it suitable for large lathes, mills, compressors, pumps, and other high-demand shop equipment that require substantial startup current.
With a maximum capacity of 56 amps, it provides the electrical headroom needed for smooth starts and stable operation, while remaining focused on single-machine applications rather than multi-load industrial systems.
As capacity increases, efficiency still matters. The SP-30 has an idle power usage of approximately $0.21 per hour, helping keep operating costs predictable in shops where the converter may remain powered for long periods.
This balance of power and efficiency makes it a practical solution for operations that need serious capability without unnecessary waste.
The SP-30 is designed to operate on a minimum 70-amp single-phase circuit, typical for well-equipped workshops and light industrial facilities running larger machinery.
At approximately 317 pounds, it reflects the robust construction and capacity required to support higher-horsepower equipment, making it best suited for permanent installation in a dedicated shop environment.
The SP-30 is intended for users who have clearly moved beyond mid-range converters and now require strong starting torque, electrical stability, and dependable performance day in and day out.
It focuses on reliability and straightforward operation, without unnecessary complexity or overengineering.
Model: SP-30
Single motor start capacity: up to 20 HP
Maximum capacity amperage: 56 amps
Minimum single-phase circuit size: 70 amps
Idle power usage: approximately $0.21 per hour
Weight: approximately 317 lbs
Established workshops and light industrial facilities
Single three-phase machines up to 20 HP
Large lathes, mills, compressors, and pumps
Fabrication, production, and maintenance environments
Users needing high starting power and stable operation
The SP-30 is built for operators who need high horsepower capability from a single-phase supply without moving into full industrial rotary systems. It delivers dependable performance, predictable efficiency, and a setup that aligns with real-world shop demands.
Energy Systems Central supplies power solutions designed around how people actually work. The SP-30 reflects that approach, strong, reliable, and purpose-built for large single-machine three-phase applications.
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Most products include a manufacturer warranty, typically starting at one year. Warranty terms vary by brand and model and are listed on each product page.
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