Additionally, the maximum power point voltage of the PV array must be matched to the inverter’s input voltage window. System designers must carefully select panel series/parallel configurations to ensure the inverter operates in its optimal rang
Agricultural Irrigation: Delivering water from boreholes, wells, or canals for crop irrigation in remote fields.
Livestock Watering: Providing consistent water supply for cattle, sheep, and poultry farms.
Domestic Water Supply: Pumping potable water from storage tanks or wells for residential use.
Water Treatment & Recycling: Powering small-scale water purification or recycling units.
Aquaculture: Maintaining water circulation in fish ponds.
Municipal Applications: Supporting rural community water supply projects, especially in developing region
A critical function embedded in this stage is Maximum Power Point Tracking (MPPT). The inverter’s microcontroller samples the PV voltage and current using voltage dividers and hall-effect current sensors. It then adjusts the boost converter’s duty cycle using algorithms such as Perturb and Observe (P&O) or Incremental Conductance (IncCond). This ensures that the PV array operates at its maximum power point despite changing irradiance. For instance, during morning hours, the duty cycle might be lowered to reduce the drawn current, preventing the panel voltage from collapsing. Under high irradiance, the duty cycle is increased to extract more current. This dynamic adjustment is visible in the circuit diagram as feedback lines connecting the sensor outputs to the ADC inputs of the microcontrolle
Installation of the Apollo SPN-216T is straightforward, but it does require attention to correct electrical connections and grounding to ensure safety and performance. The unit is typically wall-mountable and may include an IP54-rated enclosure or similar, providing protection against dust and water splashes, which is important for outdoor installations. Leonics provides detailed user manuals and technical documentation, and local distributors often offer after-sales support and warranty services.
The Apollo SPN-216T is part of a broader product family that includes other models with varying power ratings, allowing the same technology to be scaled up or down. Leonics has positioned this series as a cost-effective alternative to imported inverters, with the advantage of regional manufacturing and technical support. While specific specifications may vary slightly between production runs and firmware revisions, the core strengths of the SPN-216T remain its reliability, MPPT efficiency, integrated protections, and ease of use.
Choosing the right solar pump inverter DD requires careful system design. The total dynamic head, required discharge rate, and daily water demand must be calculated first. From these, the pump power rating is determined. The PV array must then be sized to meet the pump’s power consumption at the expected average solar irradiance, including a safety margin for temperature and dust losses. The inverter must have a voltage range that matches the PV array’s maximum power voltage and a rated power slightly higher than the pump motor’s maximum power. In addition, minimum DC startup voltage determines when the pump will begin operation in the morning; a lower startup voltage allows earlier operation. It is also necessary to consider the cable voltage drop between the PV array and the inverter, and to install surge protection in areas with lightning risk.
Another limitation is the high starting current requirement of conventional induction motors. The inverter must be sized appropriately to handle the start-up surge. However, many DD inverters employ advanced start-up techniques such as vector control or sensorless field-oriented control (FOC) to provide high starting torque with minimal current dra
2. Product Overview
The SN2200 is a 2.2 kW hybrid solar pump inverter, engineered to deliver reliable pumping performance in off-grid and grid-connected environments. It is built with a rugged IP65-rated enclosure, suitable for outdoor installation in harsh climatic conditions. The inverter is specifically designed for centrifugal pumps, submersible pumps, and surface pumps, with a maximum recommended pump motor size of 2.2 kW (approximately 3 HP). Its hybrid architecture allows for maximum utilization of solar energy while ensuring uninterrupted operation through battery backup or utility grid support during periods of low insolatio
A notable case is a project in the northeastern Thai province of Khon Kaen, where a 3-kilowatt NECTEC solar pump inverter replaced a diesel pump that consumed over 5,000 liters of fuel annually. The solar system now supplies 60 cubic meters of water per day to a 12-hectare vegetable cooperative. The system paid for itself in 2.5 years, and farmers reported a 30% increase in crop yield due to more reliable and timely irrigatio
4.1 Solar Priority Mode
In normal daylight conditions, the inverter draws energy exclusively from the solar array. The MPPT controller adjusts the output frequency to match the available solar power, ensuring the pump operates at an optimal speed. When solar irradiance is high, the pump runs at full speed; during cloudy periods, the pump slows down but continues to operate, maximizing the water output per unit of solar energ
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