Small wind / Buyer questions
Application decisions
Can an irrigation water tank replace a battery in a wind-powered pumping system?
The short answer
A tank can separate the time water is pumped from the time water is used, so it may reduce the need to store electricity for that pumping duty. It does not replace electrical storage for controls, pressure boosting or other loads. Compare the complete water service: required volume, pressure, allowable delivery window and the longest acceptable interruption. A tank is useful only when its hydraulic arrangement can provide that service.
Compare the service, not just stored kWh
Electrical storage can support several compatible loads. A water tank stores a specific service: water at an available elevation and pressure. A ground-level tank may still need a powered booster. Water quality, evaporation, leakage and usable tank volume can also constrain the arrangement. The pump and its control equipment must remain suitable for variable generation; a water reservoir does not make a direct turbine-to-motor connection acceptable.
A transparent pumping example
Assume a pump takes 2 kW at its electrical input and delivers 5 m³/hour under a stated head. Six operating hours use 12 kWh and deliver 30 m³. If the farm needs 30 m³/day, a usable 60 m³ tank represents two days of that water demand. These are hypothetical operating values, not a MARSTON turbine or pump rating. Changing the head or pump operating point changes the comparison.
Test a low-wind sequence
Model consecutive days, rather than resetting the tank to full every morning. Record water entering, water withdrawn and the reserve that must remain. Check whether the pump can refill the deficit while also meeting current demand when wind returns. A large tank can bridge a gap but cannot correct a long-term shortage of pumping energy or an inadequate water source.
Choose the boundary for the quotation
Compare three complete options: pumping into storage, electrically buffered pumping, and an existing grid or generator supply. Include the tank, booster, civil works, treatment needs, converter and controls that each option actually requires. Request separate responsibilities for the wind subsystem and water system. MARSTON does not supply its own battery-storage product; any external battery must be identified and checked with the proposed equipment.
Sources
Examples are illustrative. Confirm product-specific performance, compatibility and supply scope in the applicable documents.