Product Overview
The VFD90PV is an advanced dedicated solar water pump inverter that directly utilizes solar panels to drive AC water pumps. It eliminates the need for batteries and complex grid connections, providing an efficient, reliable, and economical solution for water supply and irrigation in any sunlit area.

Core Features & Advantages

1. Maximum Power Point Tracking Technology – Ultimate Solar Utilization
Advantage: The advanced MPPT algorithm ensures the inverter consistently extracts the maximum available power from the PV array. Compared to traditional solutions, daily power generation can be increased by up to 30%, ensuring greater water output even under low-light conditions. Solar power tracking efficiency can reach 99%.

2. Plug & Play, No Battery Required – Simple, User-Friendly, Cost-Effective
Advantage: The system is extremely simple: connect the solar panels directly to the VFD90PV, then to the water pump. Eliminating batteries significantly reduces initial investment, avoids subsequent battery replacement costs, and minimizes maintenance requirements.

3. Wide DC Input Voltage Range – Flexible PV Array Design
Advantage: Compatible with various PV module configurations (supporting 60-cell and 72-cell panels in series or parallel). This provides exceptional flexibility in system design to meet different site conditions, head, and flow requirements.

4. Robust, Durable, All-Weather Adaptability – Built for Long-Term Operation
Advantage: Features a sturdy structural design with a high protection rating (specific models up to IP20 or higher), offering dust and moisture resistance. Key components are selected for high-temperature endurance, ensuring stable operation in harsh outdoor environments from deserts to tropical regions.

5. Intelligent Control & Comprehensive Protection – Safe and Smart Operation

Advantage: 

Works at Sunrise, Rests at Sunset: Automatically starts and stops with sunlight.

Dry Run Protection: Automatically shuts down when water shortage is detected, effectively protecting the pump.

Soft Start Function: Enables smooth startup, reducing mechanical impact on the pump and system.

Fault Self-Diagnosis: Displays clear error codes for quick troubleshooting.

6. Universal Pump Compatibility – Versatile and Widely Applicable
Advantage: Capable of driving standard three-phase AC submersible pumps, centrifugal pumps, surface pumps, and more. Suitable for a wide range of application scenarios.

Technical Highlights

Model: VFD90PV

MPPT Efficiency: >99.5%

Protection Features: Overcurrent, overvoltage, undervoltage, short circuit, overtemperature, dry run, etc.

Control Function: Built-in PID for constant pressure control (optional for specific models).

Display Interface: User-friendly LED/LCD interface for real-time monitoring of solar voltage, output frequency, power, and fault status.

Ideal Application Scenarios

Agricultural Irrigation: Farmland, orchards, vineyards, greenhouses.

Domestic & Village Water Supply: Remote households, villages, and communities without grid access.

Livestock Watering: Automated drinking systems for pastures and grazing lands.

Water Transfer & Supply: Supplying water to reservoirs or elevated water tanks.

Landscaping & Fountains: Solar-powered landscape fountains and garden water features.

Why Choose VFD90PV?

Professional Assurance: VDUNELE is a globally leading supplier of drive and control technology, with products proven for reliability.

Direct Savings: Zero electricity costs, minimal maintenance expenses.

Eco-Friendly: Operates entirely on clean, renewable solar energy.

Easy Installation & Commissioning: Designed for quick setup and debugging.

Global Support: Backed by VDUNELE's worldwide distribution and service network.

Call to Action
Start your solar water supply solution today! Contact us for a customized system quote, detailed product documentation, and to find a distributor in your region!

Operational Theory of Solar Pump Drive

The solar pump drive system employs a Maximum Power Point Tracking (MPPT) control program to enhance the energy efficiency of the solar system. The output power of a PV cell is proportional to its area and the intensity of sunlight, while the output voltage is limited by the p-n junction to between 0.6 and 0.7 volts. Therefore, when the output voltage remains constant, the output power is directly proportional to the light intensity and the cell area. The current and voltage values at which the PV cell generates maximum power are referred to as the Maximum Power Point.

The MPPT controller adopts different strategies to extract maximum power from the PV array. The internal MPPT algorithm is used to obtain the maximum power from the PV cell at any given moment. This is achieved by adjusting the operating voltage or current within the PV cell until the maximum power is obtained.

When the output voltage is zero, the PV cell generates a short-circuit current. If the PV cell is not connected to any load, the output voltage equals the open-circuit voltage. The Maximum Power Point occurs at the inflection point of the I-V curve. Please refer to the I-V characteristic curve shown below.

Overview of the Solar Water Pumping System
Solar pumping systems can be applied to various forms of daily use, providing drinking water for remote villages and farms without access to the water supply network. They are also used in agricultural applications such as livestock watering, agricultural irrigation, forestry irrigation, pond management, and desert control, as well as in industrial applications including wastewater treatment.

In recent years, with the promotion of renewable energy utilization, solar pumping systems have become increasingly widely used in municipal engineering, city center squares, parks, tourist attractions, resort hotels, and fountain systems in residential areas.

The system consists of photovoltaic (PV) panels, a water pump, and a solar pump inverter. Based on the design philosophy that "storing water is more efficient than storing electricity," the system is not equipped with energy storage devices such as batteries. The system can be used in conjunction with elevated water storage facilities (e.g., water towers or uphill storage tanks).

The PV generator is a generating unit composed of multiple PV modules connected in series and parallel. It absorbs solar radiation and converts it into electrical energy to power the entire system. The pump inverter controls and regulates the entire system.

The system drives the pump by converting the DC power generated by the PV modules into AC power. It adjusts the output frequency in real time according to changes in light intensity, achieving Maximum Power Point Tracking (MPPT). The water pump, driven by a three-phase AC motor, can draw water from deep wells, rivers, and lakes, and inject it into storage tanks or reservoirs. It can also be directly connected to irrigation systems, fountain systems, etc. Depending on the actual system requirements and installation conditions, various types of pumps—such as centrifugal pumps, axial flow pumps, mixed flow pumps, or deep well pumps—can be selected.

Functions of the Solar Water Pump Drive
Energy cost savings and maximized productivity
The solar pump inverter ensures reliable power supply throughout the day, supporting both grid-connected and off-grid operation.

Environmental protection
Utilizing solar energy provides a CO₂-emission-free and environmentally friendly method of pumping.

Simple installation and operation
With very few parameters to configure, the inverter can be easily installed and operated even by end users who have never used an inverter before.

Reduced maintenance costs
The inverter can be equipped with remote monitoring options, reducing on-site maintenance trips.

Reduced operational risks
Embedded pump-specific functions include dry run detection, minimum power input protection, maximum current protection, and stop frequency operation protection.