How to design a suitable Solar Pumping System in irrigation

DESIGN A SUITABLE SOLAR PUMPING SYSTEM IN IRRIGATION

1.Calculate the total daily water demand (Q_day): "How much water does my land need every day?"

Core Formula:

Q_day (m³/ day) = irrigated area (A, unit: hectares) × crop water demand (ET, unit: mm/day) × 10

Parameter analysis：

-Irrigation area (A): the total area of land to be irrigated, which can be measured.

Note unit conversion: 1 hectare = 15 mu.

-Evapotranspiration (ET): This is the most critical data point, representing the daily water consumption of crops under specific growth conditions. It is influenced by multiple factors, including crop type (e.g., corn, vegetables, fruit trees), growth stage (with varying requirements during seedling, flowering, and fruiting phases), local climate conditions (such as temperature, humidity, wind speed, and sunlight exposure), and soil composition.

-How can one obtain this information? Initially, consult the local agricultural technology extension station or review the local agricultural irrigation manual to gather region-specific data. If such data is unavailable, one may refer to the experience-based values (for instance, 4-7 mm/day for field crops, 5-8 mm/day for vegetables and orchards), yet it is essential to prioritize local data as the benchmark.

-Constant 10: Unit Conversion Coefficient (1 mm of Water Depth = 10 Cubic Meters of Water).

Example: Suppose you have 3 hectares of vegetable land, local data shows that the average daily water requirement for vegetables in summer is 6 mm.

Q = 3 ha × 6 mm/day × 10 = 180 m³/day