Do I Lose Power When Running Equipment on a Phase Converter?
No — when properly sized, your equipment runs at full rated power on a phase converter. The converter's job is to supply balanced three-phase voltage; your equipment draws whatever current it needs, just as it would from utility three-phase.
The Critical Word: Properly Sized
An undersized converter will cause power loss, voltage sag, and sluggish performance. Sizing rules by equipment type:
| Equipment Type | Multiplier | Example: 10 HP |
|---|---|---|
| Saws, grinders, drill press | 1.0× | GP10NL |
| Lathes, mixers, conveyors | 1.5× | GP15NL |
| CNC, pumps, press brakes | 2.0× | GP20NL |
| Compressors, HVAC, fans | 2.5× | GP25NLA |
Use the right multiplier and your equipment will run at full capacity — same as utility three-phase. Call (800) 417-6568 if you are unsure which size to order.
Have questions? Talk to an engineer.
Free sizing help. Made in Phoenix, AZ. Lifetime warranty.
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More on Power Loss — FAQ
Will my CNC run at full spindle speed on a phase converter?
Yes — a correctly sized converter delivers full three-phase power. Spindle speed is controlled by your machine, not the converter.
What happens if I undersize the converter?
Voltage sag on L3, sluggish motor starts, nuisance breaker trips, and potential overheating of motors running on unbalanced voltage. Always size correctly.
Does the generated leg (L3) have lower capacity than L1/L2?
On a properly sized converter under rated load, no meaningful difference. L3 voltage may read 2–5% different from L1-L2 — within NEMA acceptable limits.
Related Articles
- How to Size a Rotary Phase Converter
- What Is a Rotary Phase Converter?
- Rotary vs Digital Phase Converters
- Phase Converter FAQ
Questions? Talk to an engineer.
Free sizing help. Made in Phoenix, AZ. Lifetime warranty on every unit.
Shop Phase Converters