Sunflow is a brand that has become synonymous with affordable solar pumping solutions in Thailand. It is often marketed as a cost-effective alternative to premium European or Chinese brands. The company's product range includes both single-phase and three-phase output inverters, with DC input options compatible with common solar panel configurations. Sunflow inverters are known for their easy-to-read LCD displays, simple parameter setting, and low failure rates. The availability of spare parts and technical support in Thailand is a significant advantage, making the brand a prudent choice for local farmers and industrial users. The price positioning of Sunflow is aggressive, aiming to reduce the initial investment barrier for solar pumping.


In a typical installation, PV modules connected in series form a PV array with a peak power voltage (Vmp) that matches the inverter's MPPT range. Under sunlight, the PV array generates a DC voltage around 220V. The inverter’s MPPT algorithm senses the panel’s current and voltage and adjusts the electronic load so that the product of the two is maximized. This maximum power is then converted into AC with a frequency proportional to the available solar power. For instance, at strong sun, the output frequency may be 50 Hz, driving the pump at rated speed. When clouds pass, the frequency drops, reducing pump speed and water flow, thereby keeping the pump within a safe operating envelope. When solar energy is insufficient to start the motor, the inverter shuts down and restarts automatically when power return

As of 2025, the retail price of a Sunflow solar pump inverter in Thailand varies significantly depending on the power rating and specification. Generally, prices are quoted in Thai Baht (THB). For a small system used with a 1 HP (0.75 kW) submersible pump, the inverter price typically ranges from 8,000 to 15,000 THB. Moving up to a 2.2 kW (3 HP) inverter, prices increase to approximately 18,000 to 28,000 THB. For medium-sized agricultural systems of 5.5 kW (7.5 HP), the price ranges from 35,000 to 55,000 THB. Larger three-phase inverters of 11 kW and above can cost anywhere from 80,000 to 200,000 THB, depending on the rated voltage (380V or 480V) and added features. It is important to note that inverter prices are often bundled with solar panels and pump sets, and the total system cost can double when panels and accessories are included.

Pump Motor Type: Ensure the inverter output matches the motor’s rated voltage, current, and frequency (e.g., 380V or 220V AC). A three-phase pump is preferred for efficiency.
MPPT Voltage Window: The PV array’s Vmp must lie within the inverter’s MPPT range (usually 200–300V for a 220VDC unit). The Voc of the array must not exceed the inverter’s maximum input voltage.
Power Rating: The inverter’s maximum continuous output power should be 10–20% higher than the pump’s power consumption to handle starting surges.
Inverter Protection: Check for IP65 or higher ingress protection for outdoor installation. Lightning protection is important in remote areas.
Installation: Placement in a shaded, well-ventilated area is advisable, as high ambient temperatures reduce inverter lifespan. Use appropriate DC fuses, disconnects, and surge protectors. Ensure the PV array cable lengths are minimized to avoid voltage drop

True Hybrid Functionality: The inverter automatically prioritizes solar power, then battery power, and finally grid power as a backup, ensuring the pump runs at all times without manual intervention.
Smart MPPT (Maximum Power Point Tracking): A high-precision MPPT algorithm continuously tracks the maximum power point of the PV array, achieving an efficiency of up to 99.5% in energy harvesting.
Wide Input Voltage Range: The inverter accepts PV input voltages from 60V to 450V DC, making it compatible with a variety of solar panel configurations (e.g., 4 to 12 panels in series).
Built-in Battery Management: The SN2200 includes an intelligent charge controller that supports 48V lithium-ion or lead-acid battery banks, maintaining battery health through temperature compensation and overcharge/discharge protection.
VFD (Variable Frequency Drive) Capability: It operates as a variable frequency drive, allowing the pump speed to be adjusted according to available solar power. This soft-start feature reduces mechanical stress and prevents water hammer in pipelines.
LCD Display and Remote Monitoring: A user-friendly LCD screen displays real-time system parameters such as PV voltage, output frequency, power, and operational status. An optional RS485 or Wi-Fi module enables remote monitoring via mobile apps or web platforms.
Overload and Protection: The inverter is equipped with comprehensive protections including overvoltage, undervoltage, overload, If you have any thoughts relating to where and how to use Newpro Power, you can get in touch with us at the web-page. short-circuit, overcurrent, and anti-reverse polarity, ensuring long-term system reliability.
IP65 Enclosure: The rugged housing is dust-tight and protected against low-pressure water jets, making it suitable for installation directly in agricultural fields or near water source