Bulambuli, Uganda

The Bulambuli District in eastern Uganda has complex terrain and low grid coverage, leaving residents dependent on poorly maintained hand pumps and contaminated shallow wells. Frequent natural disasters and power outages worsen water scarcity, while heavy rains bring fecal coliform bacteria pollution. Fortunately, Uganda’s abundant year-round sunshine makes solar water pumping systems an ideal solution.

In April 2026, a UNDP-funded solar water pumping system, built by Solartech's partner, was launched in Bulambuli. Using a modern design of deep boreholes, solar pumps, elevated storage tanks, and community water points, the project has solved the region's long-standing water supply and contamination problems, delivering clean drinking water to the local community.

This UNDP-funded project deployed two sets of Solartech PB-G3 series intelligent solar pumping inverters and stainless steel deep-well submersible pumps based on the groundwater depth and population density of Bulambuli. The system utilizes a "storage instead of battery" logic, operating directly without batteries, to meet the community's daily water needs:

🔹 System 1
- Inverter: Solartech PB7500H-G3
- Matching Deep Well Submersible Pump: SPB4-14-5.5
- PV Array Configuration: 13.2KW
- Total Dynamic Head (TDH) Design: 60 meters

🔹 System 2
- Inverter: Solartech PB3700H-G3
- Matching Deep Well Submersible Pump: SPB4-8-2.2
- PV Array Configuration: 6.6KW
- Total Dynamic Head (TDH) Design: 40 meters

🔹 System Comprehensive Performance
- Daily Water Supply: Over 100 cubic meters
- Operation Mode: Pure solar drive, fully automatic MPPT operation, zero electricity cost

Core Technical Advantages of the PB-G3 Series

The PB-G3 series inverter selected for this project is an intelligent solar pumping product designed by Solartech specifically for harsh environments. It possesses the following key advantages:
✅ High-Efficiency MPPT Algorithm: Utilizes patented dynamic VI maximum power point tracking technology, with MPPT efficiency up to 99%, fast response, and excellent stability.
✅ Wide Voltage Input Design: DC input voltage range of 500-850V, offering flexible PV module configuration.
✅ Fully Automatic Operation: No manual intervention required; the system automatically starts and stops based on sunlight conditions.
✅ High Reliability Protection: IP65 protection rating, suitable for a wide operating temperature range of -20°C to +60°C, humidity ≤95%.
✅ Comprehensive Motor Protection: Supports soft start of the pump, effectively eliminating pipeline water hammer effect; features comprehensive protection including overcurrent, overvoltage, undervoltage, and dry-run protection.
✅ Data Logging & Expansion: Supports 8 years of operational data storage, optional wireless communication module for remote monitoring.
✅ Multi-Pump Parallel Support: Scalable for high-flow, high-head system applications.

🌱 Improved Livelihoods: Supplies 100+ cubic meters of clean drinking water daily to the Bulambuli community, resolving the crisis of unclean water sources for villagers.
💧 Health Security: Clean drinking water effectively reduces the risk of waterborne diseases, improving the health of community residents.
🌍 Green and Sustainable: Solar-driven, zero-carbon emissions, aligning with Uganda's renewable energy development strategy and UNDP Sustainable Development Goals.
🏆 Demonstration Value: Serves as a classic case for UNDP in promoting solar water pumping solutions in Africa, with replicable and scalable significance.
✨ Empowering with Sunshine, Supplying Clean Water to Thousands! Solartech will continue to leverage its industrial-grade, high-quality solar water pumping technology in international aid projects, enabling clean energy to across geographical divides and benefit every corner of the world. 🌱

❓ Q: Why does UNDP consistently choose Solartech as a partner for its solar water pumping projects in Africa?
✅ A: UNDP has very strict screening criteria for equipment suppliers in its aid projects across multiple African countries. Solartech stands out repeatedly based on the following strength:
✅ High Product Reliability: The PB-G3 series inverter is specifically designed for harsh environments without or with limited access to electricity, featuring an IP65 protection rating and adaptability to high-temperature, dusty, and humid conditions.
✅ Mature and Stable Technology: Utilizes patented dynamic VI maximum power point tracking technology with MPPT efficiency up to 99%. The system operates fully automatically without manual intervention.
✅ Low Operation and Maintenance Costs: Supports wireless remote monitoring and 8 years of operational data storage, greatly reducing maintenance difficulties in remote areas.
✅ International Standards Certification: Products meet the procurement standards of the UN and other international aid organizations, ensuring quality.
✅ Global Project Experience: Solartech has successfully delivered solar water pumping projects in over 100 countries and regions worldwide, with proven engineering expertise and products fully compliant with international quality and regulatory certification standards.

❓ Q: In an area like Uganda with low grid coverage and frequent natural disasters, how can a solar water pumping system guarantee stable water supply around the clock?

✅ A: Absolutely. This precisely demonstrates the engineering advantages of solar water pumping systems:
✅ No Need for Power Grid: The solar pumping system operates completely independently of the grid, unaffected by local power outages, making it especially suitable for regions without or with limited electricity.
✅ Strong Adaptability: The PB-G3 series features highly sensitive intelligent self-start/stop and soft-start functions. Even under fluctuating light conditions such as cloudy weather, the system can maintain pumping at low frequencies. Coupled with dry-run protection, overvoltage, and overcurrent protection, the system achieves fully automatic, long-term, highly stable operation without manual intervention.
✅ High Protection Rating: With an IP65 protection rating against dust and water, the system is well-adapted to the high-temperature, dusty, and humid climate of Uganda.