Brief Report on the Inverter Solar Pumping System: GD20-015G-4 (15kW, …
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Wide Input Voltage Range: They can accept a wide range of DC input voltages, commonly from 200 V to 800 V for higher-power models, and lower ranges for sub-kilowatt units. This flexibility allows more freedom in designing the PV array configuration (series/parallel connection).
Working Principle
At its core, a 220VDC solar pump inverter performs two primary functions: DC-to-AC conversion and maximum power point tracking (MPPT). The inverter continuously monitors the voltage and current from the solar array. Because solar panel output varies with irradiance and temperature, the MPPT algorithm adjusts the electrical operating point to extract the maximum available power. For a 220VDC system, the panel array is typically configured so that the maximum power point (MPP) falls near 220V under standard test conditions. The inverter then uses pulse-width modulation (PWM) to synthesize a three-phase or single-phase AC output with variable voltage and frequency. This variable-frequency drive (VFD) capability allows the motor speed to match the available solar power, ensuring the pump starts softly and operates efficiently even in low-light conditions. When solar power is insufficient, the inverter automatically halts operation and can restart when power becomes available agai
One of the defining characteristics of the Lowara solar pump inverter is its hybrid capability. Many models can automatically switch between solar power and an auxiliary source, such as a diesel generator or the utility grid. This is particularly useful for applications requiring continuous water availability, especially during the night or prolonged periods of poor weather. The inverter manages this transition seamlessly, either by automatically starting a generator when the PV power drops below a threshold or by drawing from the grid to supplement solar energy. This hybrid operation optimizes energy costs by prioritizing free solar power while ensuring operational continuity. Some advanced models also support battery integration, allowing surplus solar energy to be stored and used later, further enhancing system autonomy.
Applications
This solar pumping inverter is primarily used in agriculture for irrigation of crops, orchards, and greenhouses. It is also employed for supplying drinking water to rural communities and villages where grid electricity is unavailable or unreliable. Livestock watering, aquaculture circulation, and small-scale water transfer for landscaping or residential use are other common applications. It is ideally suited for remote, off-grid sites where diesel generators are expensive to operate and maintain. The 15kW power class places it in the mid-to-high range of solar pumping systems, capable of delivering significant water volumes from depths of up to 200 meters or lifting water to elevated storage tanks. The inverter’s dual-input capability (single-phase grid or DC solar) also enables hybrid operation, where solar energy is prioritised, and grid power acts as a backup during extended cloudy periods. In regions with strong sunlight, the system can pay for itself within two to three years, compared to diesel-powered pumping.
Key Features and Protections
The GD20-015G-4 is designed with a comprehensive set of features tailored for solar water pumping environments. A built-in PI controller supports closed-loop pressure control by receiving signals from a pressure transmitter, allowing constant pressure water supply systems. The inverter also supports input of dry contact float switches for water level detection in the tank, enabling automatic start/stop to prevent overflow or dry running. Multi-stage pump speed control is possible through digital inputs. The unit includes a timer function for programmed operation, as well as a sleep/wake-up function to conserve energy during low demand. Protection mechanisms include overcurrent, overvoltage, undervoltage, overheat, phase loss, and short-circuit protection. A dedicated "dry pump" protection detects a no-water condition and stops the motor, protecting the pump from damage. The inverter features an LCD display for real-time monitoring of DC voltage, current, output frequency, power, and fault codes, along with a simple keypad for parameter setting. Its enclosure is typically IP20-rated for indoor installation, though the unit is commonly placed in a weatherproof cabinet near the pump. With a wide DC input voltage range (typically 350–800V), it allows flexible PV array sizing and wiring configurations.
Working Principle
The GD20-015G-4 operates as a variable frequency drive (VFD) with an integrated solar pumping logic. Its core functions include MPPT, DC-to-AC conversion, and motor control. DC power from the PV modules is fed into the inverter’s DC link through a protection circuit. The inverter’s control unit continuously samples voltage and current from the PV array and adjusts the DC-to-DC converter or the inverter modulation index to operate at the maximum power point. This ensures that even on cloudy days or during partial shading, the pump runs at the optimal speed to make use of available solar energy. The inverter then converts the DC power into a variable-frequency, variable-voltage three-phase AC supply using pulse width modulation (PWM). By adjusting the output frequency and voltage in a constant V/f ratio, the inverter controls the motor speed smoothly from zero to rated speed. This soft-start capability eliminates water hammer effects and mechanical stress on the pump. Additionally, the inverter includes a "soft stop" function to gradually slow the pump, preventing pipe rupture. When solar irradiance is insufficient to reach the inverter’s minimum operating voltage, the unit enters a standby mode, automatically restarting when adequate power is available.
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Working Principle
At its core, a 220VDC solar pump inverter performs two primary functions: DC-to-AC conversion and maximum power point tracking (MPPT). The inverter continuously monitors the voltage and current from the solar array. Because solar panel output varies with irradiance and temperature, the MPPT algorithm adjusts the electrical operating point to extract the maximum available power. For a 220VDC system, the panel array is typically configured so that the maximum power point (MPP) falls near 220V under standard test conditions. The inverter then uses pulse-width modulation (PWM) to synthesize a three-phase or single-phase AC output with variable voltage and frequency. This variable-frequency drive (VFD) capability allows the motor speed to match the available solar power, ensuring the pump starts softly and operates efficiently even in low-light conditions. When solar power is insufficient, the inverter automatically halts operation and can restart when power becomes available agai
One of the defining characteristics of the Lowara solar pump inverter is its hybrid capability. Many models can automatically switch between solar power and an auxiliary source, such as a diesel generator or the utility grid. This is particularly useful for applications requiring continuous water availability, especially during the night or prolonged periods of poor weather. The inverter manages this transition seamlessly, either by automatically starting a generator when the PV power drops below a threshold or by drawing from the grid to supplement solar energy. This hybrid operation optimizes energy costs by prioritizing free solar power while ensuring operational continuity. Some advanced models also support battery integration, allowing surplus solar energy to be stored and used later, further enhancing system autonomy.
Applications
This solar pumping inverter is primarily used in agriculture for irrigation of crops, orchards, and greenhouses. It is also employed for supplying drinking water to rural communities and villages where grid electricity is unavailable or unreliable. Livestock watering, aquaculture circulation, and small-scale water transfer for landscaping or residential use are other common applications. It is ideally suited for remote, off-grid sites where diesel generators are expensive to operate and maintain. The 15kW power class places it in the mid-to-high range of solar pumping systems, capable of delivering significant water volumes from depths of up to 200 meters or lifting water to elevated storage tanks. The inverter’s dual-input capability (single-phase grid or DC solar) also enables hybrid operation, where solar energy is prioritised, and grid power acts as a backup during extended cloudy periods. In regions with strong sunlight, the system can pay for itself within two to three years, compared to diesel-powered pumping.
Key Features and Protections
The GD20-015G-4 is designed with a comprehensive set of features tailored for solar water pumping environments. A built-in PI controller supports closed-loop pressure control by receiving signals from a pressure transmitter, allowing constant pressure water supply systems. The inverter also supports input of dry contact float switches for water level detection in the tank, enabling automatic start/stop to prevent overflow or dry running. Multi-stage pump speed control is possible through digital inputs. The unit includes a timer function for programmed operation, as well as a sleep/wake-up function to conserve energy during low demand. Protection mechanisms include overcurrent, overvoltage, undervoltage, overheat, phase loss, and short-circuit protection. A dedicated "dry pump" protection detects a no-water condition and stops the motor, protecting the pump from damage. The inverter features an LCD display for real-time monitoring of DC voltage, current, output frequency, power, and fault codes, along with a simple keypad for parameter setting. Its enclosure is typically IP20-rated for indoor installation, though the unit is commonly placed in a weatherproof cabinet near the pump. With a wide DC input voltage range (typically 350–800V), it allows flexible PV array sizing and wiring configurations.
Working Principle
The GD20-015G-4 operates as a variable frequency drive (VFD) with an integrated solar pumping logic. Its core functions include MPPT, DC-to-AC conversion, and motor control. DC power from the PV modules is fed into the inverter’s DC link through a protection circuit. The inverter’s control unit continuously samples voltage and current from the PV array and adjusts the DC-to-DC converter or the inverter modulation index to operate at the maximum power point. This ensures that even on cloudy days or during partial shading, the pump runs at the optimal speed to make use of available solar energy. The inverter then converts the DC power into a variable-frequency, variable-voltage three-phase AC supply using pulse width modulation (PWM). By adjusting the output frequency and voltage in a constant V/f ratio, the inverter controls the motor speed smoothly from zero to rated speed. This soft-start capability eliminates water hammer effects and mechanical stress on the pump. Additionally, the inverter includes a "soft stop" function to gradually slow the pump, preventing pipe rupture. When solar irradiance is insufficient to reach the inverter’s minimum operating voltage, the unit enters a standby mode, automatically restarting when adequate power is available.
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