Grundfos SQFlex Pumps at Mohamed Harb Contracting

Founded in 2016, Mohamed Harb Contracting has quickly grown into a reputable company in Egypt, offering services across construction, infrastructure, agricultural projects, and water system installations.

Their mission is to deliver integrated solutions that combine quality, cost-effectiveness, and technical excellence, while maintaining strict safety and delivery standards.

Through their official website, you can explore the projects they’ve executed and the services they provide.

As part of their expertise, the company supplies and installs advanced pump systems, including Grundfos SQFlex pumps, offering clients full-cycle service from consultation to after-sales maintenance.

3.1 Concept and History

• The SQFlex series from Grundfos is a range of submersible pumps designed to operate with renewable energy sources such as solar panels and wind turbines, in addition to conventional AC or DC electricity.

• These systems are particularly useful in remote areas where grid power is unavailable or unreliable.

• Grundfos, a global leader in pump solutions, designed SQFlex after years of experience in submersible pump engineering and renewable energy integration.

3.2 Main Components of the SQFlex System

The SQFlex is not just a pump but a complete system. Its main components include:

This system is multi-source, ensuring flexibility and uninterrupted operation even during cloudy days or low wind speeds.

3.3 Types and Technologies

Grundfos SQFlex pumps come in two main designs:

1. Helical Rotor Pumps

   • Suitable for high head (deep wells) and low flow applications.

   • Used in deep wells with large vertical lift requirements.

2. Centrifugal Pumps

   • Best for medium to low head with high flow rate applications.

From an electrical perspective, SQFlex pumps operate across a wide voltage range (30–300V DC or 90–240V AC), with an integrated Maximum Power Point Tracking (MPPT) feature to optimize solar energy use.

They also include built-in protections: dry-run protection, overload protection, and overvoltage protection.

SQFlex pumps offer several advantages that make them a preferred choice in many projects:

• Flexible power sources: solar, wind, grid, or generator.

• High energy efficiency: MPPT ensures maximum use of available power.

• Advanced protection: dry-run, overload, and intelligent monitoring.

• Durability: stainless steel components ensure long service life.

• Low maintenance: fewer moving parts and simple design.

• Environmentally friendly: reduced reliance on diesel or fossil fuels.

• Remote operation readiness: ideal for isolated locations.

• Supports sustainability goals: integrates with green and eco-friendly projects.

SQFlex pumps are used in various sectors:

• Water supply for villages and rural communities

• Agricultural irrigation (small to medium-scale farms)

• Livestock watering systems

• Light industrial water applications

• Pumping from deep wells into storage tanks

• Hybrid water systems for off-grid housing or construction sites

Choosing the right SQFlex pump depends on several factors:

1. Water demand: daily volume, peak demand, pressure needs.

2. Well depth and static water level.

3. Available power source: solar, grid, or hybrid.

4. Pump type: Helical rotor for high head/low flow, centrifugal for medium head/high flow.

5. Losses: account for friction loss in pipes and voltage drop in cables.

6. Safety margin: always design with extra capacity for unforeseen conditions.

7. Maintenance needs: consider site accessibility and service availability.

Mohamed Harb Contracting provides technical consultation and pump sizing services, ensuring clients select the most efficient and reliable model.

General steps for installing SQFlex pumps:

1. Prepare the well (ensure correct diameter, depth, and no obstructions).

2. Install cables between pump and controller.

3. Mount CU-202 controller in a safe, accessible location.

4. Connect switch boxes (IO-50, IO-101) if required.

5. Connect solar panels or power source.

6. Perform voltage and current checks.

7. Run test operation and monitor via controller.

8. Adjust settings if necessary.

9. Monitor for stability before final commissioning.

• Clean solar panels regularly for maximum efficiency.

• Monitor controller display for errors or alerts.

• Inspect cables for wear or damage.

• Ensure pump never runs dry (CU-202 dry-run protection helps).

• Check pipes and valves for leaks.

• Keep a service log for long-term performance tracking.

• Low sunlight or wind: add more panels, batteries, or backup generator.

• Fluctuating water levels: design with safety margins.

• Electrical issues: use high-quality cables and surge protection.

• Sediment or sand in wells: install protective filters or screens.

• High upfront cost: offset by reduced long-term fuel and maintenance costs.

Mohamed Harb Contracting offers end-to-end services for SQFlex systems:

• Feasibility studies and consultation

• Pump selection and system design

• Supply of pumps and accessories

• Professional installation and commissioning

• Operation training and documentation

• Scheduled maintenance and after-sales support

This ensures clients benefit from complete, worry-free solutions tailored to their needs.

The Grundfos SQFlex pump series represents a next-generation water pumping solution — flexible, efficient, and sustainable. Its ability to operate with multiple energy sources makes it ideal for projects in remote or off-grid areas.

By partnering with Mohamed Harb Contracting, clients gain access to both advanced pump technology and a trusted local partner who can deliver, install, and maintain these systems with professional expertise.

12. References and Useful Links

• Grundfos Official SQFlex Product Page

• SQFlex Technical Brochure (PDF)

• Grundfos SQFlex Installation & Operation Manual (PDF)

• Mohamed Harb Contracting Official Website

• Grundfos SQFlex Video Guide