VFD for a single-phase pump: when we ship a 1ph→3ph converter and when we do not
Most «single-phase pumps» we sell are actually three-phase motors that need to run from a household 220 V supply. In that case we ship a 1ph→3ph drive: 220 V on the input, three-phase output for the pump. Veichi AC10 series T/S2 at 0.75 kW is our top mover (85 units shipped over 12 months). If the pump is genuinely single-phase with a starting capacitor, the approach is different (1ph→1ph with circuit changes, or swap the motor for a three-phase one). Ask before ordering.
Typical power range for residential and farm duties: 0.75-2.2 kW. A submersible pump at 1.5 kW. A surface station at 0.75 kW. A drainage pump at 1.1 kW. All of these run fine off a 1ph→3ph drive with no extra components.
First question we ask: what type of pump do you actually have
Two typical configurations. First: a three-phase pump with a 380 V Δ / 220 V Y nameplate. We switch the motor windings to delta (Δ) and ship a 1ph→3ph drive with 220 V output. Our most-shipped SKUs are Veichi AC10-T/S2-R75G-B-VC at 0.75 kW (85 sold) and AC10-T3-1R5G-B at 1.5 kW (120 sold). Second: a three-phase 380 V pump that cannot be reconnected. That needs a step-up 1ph→3ph drive. Those are pricier and capped at about 2.2 kW.
What else we ask before the order. First: the nameplate current of the pump (we size the drive with a 20-30% current margin). Second: do you need a pressure PID loop (almost always yes for a borehole), which requires a 4-20 mA pressure sensor. Third: cable length from drive to pump. If it is over 30 m we add a motor choke, otherwise the IGBT module will fail within a year. Delivery from our Kyiv warehouse in 1-3 days.
Top brands for this task
Based on our 12-month sales: Veichi, Delta Electronics, INVT, Danfoss, Mitsubishi Electric.
Filter by key parameters
0.75 kW, 1.5 kW, 2.2 kW, 1x220 V, 3x380 V.
FAQ
Can I use a VFD with a single-phase pump?
Yes, if wiring scheme and drive compatibility match your motor type.
Main benefit of adding a VFD?
Smooth start, reduced hydraulic shock, and stable pressure.
Which settings matter most?
Motor current, acceleration ramp, minimum frequency, current limit, and dry-run protection.
Why does the pump overheat after VFD installation?
Usually due to incorrect motor parameters or operating below recommended frequency for too long.
Warranty and support
We provide model selection, compatibility checks, startup recommendations, and delivery across Ukraine.
