3″–4″ DC Screw Solar Pump
Engineering note. Maximum head and maximum flow are curve endpoints, not one simultaneous duty point. Final selection is verified against your total head, required flow and solar resource.
- Permanent-magnet brushless motor + intelligent MPPT (auto start/stop, soft-start)
- Controller LED display: voltage / current / power / speed (RPM) / error code
- Oil cooling
- Full protection: over/under-voltage, overload, over-current, dry-run, reverse, over-temp
- Runs directly off PV modules — no batteries required
- Progressive-cavity screw + SUS304 sleeve — well-suited to sandy / silty water
Performance Curves (Q–H)
Head–flow curve of every model in this series — exact data from our engineering datasheets.
Specifications
| # | Model | Voltage (V) | Power (W) | Current (A) | Max flow (m³/h) | Max head (m) | Outlet | Ø (mm) | Length (mm) | Weight (kg) | Recommended cable (mm²) | Recommended PV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 3PWSS1.0-55-24-180 | 24 | 180 | 7.5 | 1 | 55 | 0.75" | 74 | 710 | 5.8 | 2.5 | 1 × 250 Wp |
| 2 | 4PWSS2.5-40-24-250 | 24 | 250 | 10.4 | 2.5 | 40 | 1" | 98 | 760 | 8.6 | 4 | 1 × 330 Wp |
| 3 | 3PWSS1.2-65-24-250 | 24 | 250 | 10.4 | 1.2 | 65 | 0.75" | 74 | 730 | 6 | 4 | 1 × 330 Wp |
| 4 | 4PWSS3.0-60-48-400 | 48 | 400 | 8.3 | 3 | 60 | 1" | 98 | 790 | 9.5 | 2.5 | 2 × 300 Wp |
| 5 | 3PWSS1.5-95-48-400 | 48 | 400 | 8.3 | 1.5 | 95 | 0.75" | 74 | 780 | 6.7 | 2.5 | 2 × 300 Wp |
| 6 | 4PWSS2.3-95-72-600 | 72 | 600 | 8.3 | 2.3 | 95 | 1" | 98 | 840 | 10.8 | 2.5 | 3 × 300 Wp |
| 7 | 3PWSS1.9-110-72-600 | 72 | 600 | 8.3 | 1.9 | 110 | 0.75" | 74 | 840 | 7.5 | 2.5 | 3 × 300 Wp |
| 8 | 4PWSS3.6-110-96-750 | 96 | 750 | 7.8 | 3.6 | 110 | 1" | 98 | 870 | 11.7 | 2.5 | 3 × 300 Wp |
| 9 | 3PWSS2.0-130-96-750 | 96 | 750 | 7.8 | 2 | 130 | 0.75" | 74 | 890 | 8.2 | 2.5 | 3 × 300 Wp |
Motor & Drive
| Motor | Permanent-magnet DC brushless (PMSM) |
| Drive | Sensorless FOC, pure sine-wave output |
| MPPT tracking | >99% |
| Insulation class | F (155 °C) |
| Duty | S1 (continuous) |
| Ingress protection | IP68 (submersible motor) / IP66 |
| Max immersion | 150 m |
| Warranty | 2 years |
Controller & Protections
| Controller | Sensorless FOC sine-wave vector drive + MPPT (>99%), LED display |
| Display | Voltage, Current, Power, Speed (RPM), Speed adjustment, Error code |
| Controller size | 250 × 175 × 110 mm |
Operating conditions
| Water temperature | 0–40 °C |
| Sand content | ≤ 0.25 % (sand-tolerant screw) |
| pH range | 5–9 |
| Ambient temperature | -15 to 70 °C |
| Min. borehole | 76–100 mm |
Materials
- Standard — SUS304 outer sleeve + steel/NBR progressive screw rotor + SUS304 shaft (Progressive-cavity screw handles sandy / silty water well)
- Corrosion (option) — SUS316 sleeve, shaft & fittings
- Economy (option) — SUS201 sleeve (lower cost, reduced corrosion resistance)
Premium components
- 100% copper motor windings
- Class F (155 °C) insulation system
- NSK-grade sealed ball bearings
- SUS304 shaft + steel/NBR progressive-cavity screw (sand-tolerant)
- NBR stator — handles silty / sandy water
- Oil-cooled motor
- PMSM + sensorless FOC sine-wave controller, MPPT >99%
Recommended cable
PV-to-controller & motor cable 2.5–4 mm² by model (copper, sized for a ~50 m run; step up one size per additional ~50 m of drop).
Per-model cable cross-section is listed in the specification table above (mm² column).
Certifications
Frequently asked questions
What power and voltage options does the 3″–4″ DC Screw Solar Pump come in?
The 3″–4″ DC Screw Solar Pump range covers 9 models from 180 W to 750 W, with system voltages of 24 / 48 / 72 / 96 V.
What maximum head and flow can the 3″–4″ DC Screw Solar Pump reach?
Top models reach up to 130 m maximum head and up to 3.6 m³/h maximum flow. These are curve endpoints, not one simultaneous duty point — the exact model is selected against your required head, flow and solar resource.
Does the 3″–4″ DC Screw Solar Pump need batteries to run on solar power?
No. It runs directly off PV modules through an MPPT controller (>99% tracking efficiency), so no battery bank is required.
Is the 3″–4″ DC Screw Solar Pump protected against dry running?
Yes. Built-in protections include Overload, Over-current, Under-load, Under-voltage, Reverse-connection, Over-temperature (thermal), Dry-run / low-water, Soft-start. The pump motor is rated IP68 (submersible motor) and the controller is rated IP66.
What borehole size does the 3″–4″ DC Screw Solar Pump fit, and how deep can it be installed?
It is available in 3″ / 4″ diameters and fits boreholes of 76–100 mm minimum inner diameter; the maximum immersion depth is 150 m.
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