Technical Overview
The GD20-015G-4 belongs to a well-established family of variable frequency drives (VFDs) from the GD20 series, adapted specifically for pumping applications. The designation “015G” indicates a 15 kW constant-torque rated unit, while the suffix “4” refers to the output voltage class—here, 380–480 V three-phase. The output current of 32 A corresponds to the maximum current the inverter can supply continuously to the motor. A notable aspect of this model is its input configuration: it accepts a single-phase 220 V AC supply, yet produces a three-phase 380 V AC output. This is achieved through a built-in voltage-doubling or boost circuitry, enabling the inverter to drive a standard three-phase pump motor from a widely available single-phase residential or agricultural power line. Alternatively, when connected to solar panels, the inverter’s internal DC bus can be fed through an MPPT (Maximum Power Point Tracking) controller, allowing the pump to run at varying speeds depending on the available sunligh
Another critical factor is the input voltage and MPPT precision. Inverters designed to handle higher DC input voltages (e.g., 400V to 800V) or that have dual MPPT trackers are more expensive because they accommodate larger solar arrays and offer greater flexibility in panel string configuration. The efficiency rating, usually between 95% and 99%, also plays a role: a higher efficiency inverter reduces the required solar panel area and thus lowers the overall system price. Premium inverters with 99% peak efficiency and advanced cooling systems command a higher upfront cost but offer better return on investment over a lifespan of 10–15 years.
Drip and sprinkler irrigation for small to medium farms.
Livestock watering in remote pastures.
Potable water supply for rural villages and households.
Fountains, water circulation, and aquaculture aeration.
Saltwater or brackish water handling (with appropriate material upgrades).
The primary function of a solar pump inverter is to regulate the power supplied to the pump motor in response to varying sunlight intensity. Unlike standard inverters used in grid-connected systems, a solar pump inverter must operate efficiently over a wide input voltage range, handle frequent start-stop cycles, and protect the pump from dry running, overvoltage, and overload. The Maule series is specifically engineered to meet these challenges. It employs Maximum Power Point Tracking (MPPT) technology to extract the maximum available power from the solar array at any given irradiance and temperature condition. This ensures that the pump operates at its optimal speed even on cloudy days, early mornings, or late afternoons, significantly improving the overall system efficiency.
One of the standout aspects of the Novem inverter is its energy management capability. By using a sensorless vector control or closed-loop scalar control, the inverter can deliver a high starting torque—up to 150% of rated torque—which is essential for submersible pumps that have to overcome static pressure head. This is achieved without the need for a bulky capacitor bank. As the sun sets, the inverter gradually reduces the speed of the pump instead of stopping abruptly, which prevents water hammer and minimizes stress on the piping network.
The growing demand for sustainable agricultural irrigation and off-grid water supply has brought solar water pumping systems into the spotlight. At the heart of these systems lies the solar water pump inverter, a critical component that converts DC power from solar panels into AC power for the pump, ensuring efficient operation under varying sunlight conditions. For buyers, system integrators, and farmers, the question of “ราคา” (price) is often the first consideration. This report provides a detailed examination of solar water pump inverter pricing, including the factors that influence costs, typical price ranges, and the economic rationale behind the investment.
In conclusion, INVT solar pump inverters represent a mature and dependable technology within the renewable energy water-pumping sector. Their advanced MPPT control, wide input voltage range, robust protection features, and flexible monitoring options make them an excellent choice for both small-scale and large-scale projects. By converting abundant solar energy into water flow, these inverters enable energy independence, financial savings, and environmental stewardship. As the cost of PV modules continues to decline and the need for sustainable irrigation grows, the adoption of INVT solar pump inverters is expected to increase further, helping to address water scarcity and agricultural challenges in developing and developed regions alike. Their proven track record in demanding field conditions reinforces their position as a trusted component in the global transition toward solar-powered water management.
Installation and Maintenance
The inverter is housed in a rugged IP20 enclosure (with optional IP54 upgrade for outdoor use) and can be mounted on a wall or inside a control cabinet. The operating temperature range is typically from -10°C to +50°C, with derating above 40°C. For solar installations, the PV array’s open-circuit voltage must be kept within the inverter’s DC input limits, and the pump motor’s rated voltage and current must be matched to the inverter output ratings. Installation is straightforward, and the keypad offers a guide for setting the motor parameters, control mode (V/F or vector), and PID reference. Routine maintenance is minimal, consisting of periodic cleaning of the cooling fan and heatsink, checking for loose terminals, and verifying that the internal capacitors remain within specified toleranc
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