How to Select 220V / 380V Single‑Phase & Three‑Phase Solar Pump VFD Inverter for Agricultural Irrigation Projects

For off‑grid agriculture, pasture irrigation and desert water supply projects, you need a solar pump VFD inverter that supports both 220V single‑phase and 380V three‑phase AC pump motors, delivers high‑efficiency MPPT tracking and complete hardware‑level motor protection. Dolycon CT112 series solar pump inverter covers power from 0.75kW up to 1250kW to meet small‑scale well pumping and large‑scale farm irrigation demands.

Solar‑powered water pumping is a reliable solution for remote locations with unstable or no grid access. However, many integrators face frequent field failures caused by mismatched voltage phases, insufficient MPPT voltage windows or missing dry‑pump protection. When you source solar pump inverters, power rating alone is never enough; phase compatibility, PV input range, built‑in protection and after‑sales support decide long‑term onsite uptime.

Key Specifications You Must Check Before Buying Solar Pump VFD Inverter

Before requesting quotations, confirm these critical parameters against your pump motor and solar PV array. Wrong selection leads to pump stalling, over‑voltage shutdown and extra project maintenance cost.

1. Phase & Output Voltage Matching

Many project mistakes come from ignoring phase requirements of existing water‑pump motors.

• 220V single‑phase output: fits small household wells, garden irrigation with single‑phase AC induction pumps
• 220V three‑phase output: compact mid‑size pumping units
• 380V three‑phase output: large‑scale farm irrigation, deep borehole pumps, livestock pasture water supply

The Dolycon CT112 solar pump inverter supports both single‑phase and three‑phase output covering 220V /380V, removing the need to stock two separate inverter families for mixed‑motor projects.

2. MPPT Tracking Efficiency & PV Input Voltage Window

A wider MPPT operating window improves system stability under changing sunlight and temperature conditions.

CT112 series achieves up to 99% MPPT efficiency, powered by TI DSP digital control and Infineon IGBT power modules. For 380V three‑phase models, maximum PV open‑circuit voltage reaches 780VDC, with recommended MPPT working range at 540‑630VDC. For 220V models, max PV input voltage is 450VDC with MPPT window 320‑370VDC. This wide voltage tolerance helps avoid frequent shutdowns caused by cold‑morning high PV voltage or voltage drop under hot‑day strong sunshine.

3. Full‑Set Hardware Protection Functions for Harsh Field Environment

Field irrigation sites often face unstable solar input, water shortage and grid surge. Your solar pump VFD needs multi‑layer protection rather than basic software alarm only.

Essential protection checklist for solar pump inverters: ✅ Over‑load, over‑current, over‑voltage & under‑voltage protection ✅ Short‑circuit protection, PV reverse‑connection protection ✅ Dry‑pumping protection (critical for borehole pumps when water level drops) ✅ Over‑heating & lightning surge protection

Dolycon CT112 integrates all above‑mentioned protection features. It also supports automatic sleep & wake‑up function: the inverter can auto‑start or stop the pump according to water‑tank water level variation or sunlight intensity change, realizing unattended field operation. RS485 remote control protocol is reserved for remote monitoring requirements.

4. Power Range Compatibility

Choose an inverter power rating matching or slightly higher than pump motor power to handle motor starting surge current.

CT112 series covers rated power 0.75kW‑1250kW (1HP‑1700HP). The broad model portfolio covers small residential wells all the way up to mega‑scale agricultural irrigation systems.

Typical Real‑World Application Scenarios for Multi‑Phase Solar Pump VFD

The multi‑voltage, multi‑phase CT112 solar pump inverter is widely deployed for these projects:

1. Agriculture & forestry irrigation for off‑grid farmland
2. Pasture livestock water supply in remote grassland areas
3. Desert control water pumping systems
4. Rural off‑grid municipal water supply
5. Landscape solar water pump projects

The unit supports dual DC‑PV input and AC backup generator input. Note that DC and AC input cannot work simultaneously. When sunlight is insufficient, users can switch to generator AC input to guarantee continuous water supply for critical projects.

What Differentiates Dolycon CT112 Solar Pump Inverter from Generic Suppliers?

When evaluating solar pump inverter manufacturers, buyers should focus on real‑factory evidence: R&D capability, warranty terms, MOQ, OEM service and technical support.

1. R&D strength: Dolycon team includes over 30 R&D full‑time engineers (1 PhD, 10 masters), focusing on variable‑frequency drive and solar pumping solution development.
2. Warranty: 18‑month factory warranty from shipment date. Defective‑product compensation policy is available for qualified quality issues.
3. Order flexibility: MOQ for CT112 series solar pump inverter is 10 units; small trial orders are welcome for long‑term partnership. OEM & customized service is supported for distributors and system integrators.
4. Environment adaptability: Operating ambient temperature ranges ‑10℃ ~ 50℃; for altitude above 1000m, derating operation is supported. Wall‑mount or rail‑mount installation options are available for different cabinet layouts.

For full specification tables, model lists and product photos of CT112 series 380V/220V 3‑Phase /1‑Phase Solar Pump Inverter VFD: visit our product page: