Applications / Engineering guide
Wind Power for Water Pumping & Irrigation Loads
An electric wind turbine can be assessed as one source in a pumping project’s electrical supply. Begin with the water service and the actual pump-drive requirements, then compare wind availability with the periods when pumping is needed.
Define the water duty before selecting the wind equipment.
The project needs a hydraulic duty, an electrical interface and a supply plan. A wind turbine rated in kW does not establish a flow rate or a compatible pump connection.
01 / Water demand
State the volume and timing of the required service.
Provide the water volume required per day or operating cycle, the seasonal schedule and the period in which it must be delivered.
Provide the water volume required per day or operating cycle, the seasonal schedule and the period in which it must be delivered. Identify any minimum flow, pressure or continuity requirement. Separate a flexible tank-filling task from a process needing uninterrupted pumping.
Retain the water-demand basis and the responsible irrigation or process designer. An area of farmland alone cannot determine pumping electricity. Include the source-water constraints, destination and other users of the same water system when defining the duty.
02 / Hydraulic duty
Use flow and total head at the operating point.
Obtain the required flow and total dynamic head, including the applicable elevation, pressure and pipe-system effects.
Obtain the required flow and total dynamic head, including the applicable elevation, pressure and pipe-system effects. Ask the pump supplier for the curve and proposed operating point. Maximum flow and maximum head labels do not establish that both occur together.
For physical context, hydraulic power is rho × g × Q × H, with density in kg/m³, flow in m³/s and head in metres, giving watts. This is water power only. Pump, motor, drive and electrical losses require their own evidence; it is not a turbine-sizing result.
03 / Pump & drive
Identify the electrical equipment the supply must serve.
Collect the pump, motor and drive identities, rated inputs, operating limits and start behaviour.
Collect the pump, motor and drive identities, rated inputs, operating limits and start behaviour. If a variable-speed drive is proposed, obtain its supply and control documentation. Define which device sets pumping demand and handles source or tank conditions.
The turbine generator should not be assumed to connect directly to a pump or to a solar-pump drive. The selected controller, conversion equipment and pump drive need an agreed interface. Use the electrical interface record for the proposed connection.
04 / Timing & storage
Check whether pumping can move to another time.
Compare the permitted pumping hours with the site’s wind records and water-use schedule.
Compare the permitted pumping hours with the site’s wind records and water-use schedule. If a tank is proposed, ask the water-system designer to define usable volume, operating levels and the allowable interruption. Water storage and electrical storage serve different functions.
Record the periods in which stored water would be insufficient or a pump must run independently of wind generation. Establish the role of grid supply or another agreed source. Third-party electrical storage, if proposed, needs its own capacity and equipment-compatibility review.
05 / Candidate systems
Compare options at the same water-service boundary.
Compare wind-supported supply, solar-supported supply and the existing supply against the same delivery obligation.
Compare wind-supported supply, solar-supported supply and the existing supply against the same delivery obligation. Record the resource data, pumping schedule, drive arrangement, backup and project costs behind each candidate. Wind is useful only if the site and service assessment support its contribution.
A comparison should identify unmet water demand as well as generated electricity. Do not convert a turbine’s rated kW into guaranteed daily water volume. The wind-versus-solar guide helps keep the comparison inputs consistent.
06 / Enquiry pack
Send the water duty and equipment documents together.
Provide site coordinates, wind data, demand timing, pump curve, motor-drive documents and the intended electrical supply.
Provide site coordinates, wind data, demand timing, pump curve, motor-drive documents and the intended electrical supply. Include existing grid or backup information and distinguish supplied equipment from local water-system design and installation work.
MARSTON can review the wind-equipment enquiry around the confirmed 5, 10, 20, 30 and 50 kW range. Model selection still needs the actual duty and applicable electrical configuration. Request a documented scope and assumptions before treating a proposal as an integrated pumping solution.
Continue the review with Wind vs Solar for Remote Power: Compare the Project.
Continue the review with Wind Turbine Electrical Interfaces & Single-Line Diagrams.
Continue the review with Wind Turbine Annual Energy: Inputs, Calculation & Uncertainty.
Further project guides: Wind Power for Greenhouses: Climate-Control Load Assessment.
General background: FAO: water pumping power, flow and head. These references explain industry concepts; they are separate from the applicable MARSTON product and project documents.
Prepare the information for this review.
Use the checklist to organise the project information. Mark unavailable items and retain document references.
| Review item | Information to provide | Purpose |
|---|---|---|
| Water service | Volume, seasons, delivery window and required continuity | Define the actual service obligation. |
| Hydraulic point | Flow, total head, pump curve and water-source limits | Establish pump duty. |
| Electrical drive | Motor, drive, input limits and start behaviour | Review the required supply interface. |
| Timing & backup | Wind data, tank role and alternative supply | Assess generation against demand. |
| Project scope | Equipment, water-system design and local works | Prepare a reviewable enquiry. |
Engineering questions.
Is this a mechanical windpump guide?
This guide concerns an electric wind turbine in a pumping project’s electrical supply. It does not describe a direct mechanical pump drive.
Can rated turbine kW determine daily water volume?
Water output depends on the pumping duty, equipment performance, resource timing and supply arrangement. Rated kW alone is insufficient.
Can the turbine connect directly to a solar-pump controller?
Compatibility requires review of the actual input characteristics, operating functions and proposed conversion equipment. Do not assume direct connection.
Does a water tank remove the need for backup?
That depends on the usable water volume, permitted pumping interruption and actual resource conditions. The water-service designer should assess it.
What does the hydraulic-power formula exclude?
It excludes the losses and operating limits of the pump, motor, drive and electricity supply. It does not predict wind output.
What is needed to select a turbine for irrigation?
Provide water duty, pump and drive documents, resource data, timing flexibility, continuity needs and the intended supply configuration.
Technical enquiry
Bring your project information to the discussion.
An electric wind turbine can be assessed as one source in a pumping project’s electrical supply. Share the available information and the equipment scope you want reviewed in a technical quotation.