Submersible vs Turbine Pump for Solar Tube Wells in Pakistan

Key Takeaways

• Solar submersible pumps are widely available for agricultural tube wells in Pakistan, with 3 HP models starting from PKR 75,000.
• The choice between a submersible and a turbine pump primarily depends on borehole depth, the water table, and maintenance considerations.
• Complete solar tube well systems, including panels and a VFD, are available from Alpha Solar, starting at PKR 345,000 for a 3-HP setup.
• All prices and specifications were observed on 2026-08-26.

Choosing Between Submersible and Turbine Pumps for Solar Tube Wells

When setting up a solar tube well for agriculture in Pakistan, a key decision is the type of pump: submersible or turbine. This choice significantly impacts installation, maintenance, and long-term performance, especially given factors like borehole depth, the dynamic water table, and access for servicing.

A submersible pump, as its name suggests, is designed to be fully immersed in the water. Both the motor and the pump assembly are sealed and lowered into the borewell. In contrast, a turbine pump typically has its motor located above ground, with a long vertical shaft connecting it to the pump impellers submerged in the water.

While both types can be effectively driven by solar power using a Variable Frequency Drive (VFD), their mechanical differences make them suitable for different applications. The Pakistani retailers we could reach list submersible pump models and system configurations, with no specific performance data for turbine pumps or direct comparative metrics. Therefore, general engineering principles guide the discussion on their suitability.

Solar Submersible Pump Prices in Pakistan

Solar submersible pumps are a common choice for tube wells due to their efficiency in deep boreholes and their compact design. Retailers like w11stop.com offer various models. For instance, DAB solar submersible pumps are available in different horsepower ratings.

These prices are for the pump unit only. A complete solar tube well system requires additional components, including solar panels and a solar pump inverter (VFD).

Solar Pump Inverter (VFD) Prices

A solar pump inverter, also known as a Variable Frequency Drive (VFD), is crucial for converting the DC power from solar panels into AC power suitable for the pump motor. It also optimizes pump performance by adjusting motor speed based on available solar irradiance. You can learn more about selecting the right controller in our guide on solar pump inverter VFD selection.

Several brands offer solar pump inverters in Pakistan. Here are some examples from w11stop.com:

What a Solar Tube Well System Includes (and Costs)

A complete solar tube well system goes beyond just the pump and inverter. It includes solar panels, mounting structures, and associated electrical components. Alpha Solar, for example, provides system configurations for agricultural use.

What the price does and does not include: The system prices listed by Alpha Solar include the solar panels, the VFD, and the specified mounting structure. For a 3-HP solar tubewell pump, the required solar system is approximately 3 kW, consisting of 6 solar panels, each with a capacity of 500 watts, and a 5 kW VFD. For a 5-HP solar tubewell pump, the system includes 10 solar panels, each with a capacity of 545 watts, and a 5 kW VFD.

These figures represent the component cost of the system. A real installed price would also include costs for installation labor, electrical cabling, protection devices (like surge protectors and circuit breakers), earthing, and any necessary civil works for the pump house or borewell casing. For larger systems, you can refer to our guide on 10-15-20HP solar tube well systems.

How to Choose Your Solar Tube Well Pump

The decision between a submersible and a turbine pump for a solar tube well involves several practical considerations:

• Borehole Depth: Submersible pumps are generally more efficient and cost-effective for very deep boreholes because they do not require a long, rigid drive shaft, which can be complex and expensive to install and maintain.
• Water Table: In regions like Pakistan facing falling water tables, a submersible pump can be lowered further into the well as the water level drops. Turbine pumps may require significant modifications or extensions to their shafting. Our guide on groundwater rules and agri-solar discusses this further.
• Water Quality and Silt: Submersible pumps are sealed units, which can protect the motor from abrasive particles like silt. However, excessive silt can still wear down impellers. Turbine pumps, with their pump section at the bottom, can also be affected by abrasive water, but their above-ground motor is protected.
• Maintenance Access: Turbine pumps often allow for easier access to the motor for maintenance or repairs, as it is above ground. However, servicing the pump impellers still requires pulling the entire shaft assembly from the well. Submersible pumps require the entire unit to be pulled for any motor or pump repair.
• Installation Complexity: Submersible pumps can be simpler to install in terms of mechanical alignment, as the motor and pump are a single unit. Turbine pumps require precise alignment of the long drive shaft.
• Solar Drive Compatibility: Both pump types can be driven by solar VFDs. The VFD's ability to provide sufficient starting torque and operate efficiently across a range of speeds is critical for solar applications, where power input varies throughout the day.

Considering the long-term operational costs, including maintenance and potential for diesel backup during cloudy periods, can help in making an informed decision. Our article on solar tube well vs diesel monthly savings provides a financial perspective.

What we could not verify

Our research for this article focused on verifiable prices and specifications from publicly available sources. We found that specific head, flow, or efficiency figures for a direct engineering comparison between submersible and turbine pumps were not published by the retailers or brands we reviewed. The available sources primarily discuss submersible pumps or general "tubewells" without explicit turbine pump details or comparative performance metrics.

Additionally, while we attempted to access product information from Daraz category pages for "3 hp submersible water pump" and "5 hp submersible pump," the listings rendered client-side, preventing us from extracting specific product details or prices. The content of a YouTube video titled "3 inch solar water pump price in Pakistan/how much solar Panel.5hp submersible water pump" was also not provided for extraction. No specific details from the "Solar Water Pumps: Boosting Agriculture in Pakistan" article by Feroze Power were available in the fetched content.