Case Study: Integrated Solar Power and Energy Storage System in Da Nang City Center

Located in the center of Da Nang City, this residential home partnered with LenX Energy to significantly reduce household electricity costs and enhance energy independence. Following a detailed assessment of the rooftop conditions and electricity consumption needs, a 7.74 kWp hybrid solar power system was deployed, utilizing 12 LONGi Hi-MO 10X 650 W solar panels, combined with a 6 kW hybrid inverter and a 14.3 kWh battery storage system. The system currently offsets approximately 80% of the total annual electricity consumption, providing clean and reliable energy both day and night, while minimizing reliance on the power grid.

Key Statistics

Location: Da Nang City Center, Vietnam
System Configuration: 12 × LONGi Hi-MO 10X 650 W solar panels, 1 × 6 kW hybrid inverter, 1 × 14.3 kWh lithium battery storage system
System Capacity: 7.74 kWp
Grid Dependency Reduction: Approximately 80% reduction in annual electricity consumption from the national power grid
Environmental Benefits: Significant reduction in CO₂ emissions over the system’s lifetime, contributing to clean and sustainable energy goals in urban areas

Why Choose LenX Energy?

With proven experience in hybrid residential solar power systems in urban environments, LenX Energy delivers end-to-end solutions precisely designed to meet the specific needs of each household. For this project, the LenX Energy team carried out every stage, from electricity consumption assessment, optimizing the system design for limited rooftop space, to installation and commissioning of the integrated battery storage system, ensuring maximum efficiency and cost savings. The result is a stable and reliable system, significantly reducing annual electricity costs and enhancing long-term energy independence for the homeowner.

Objectives and Challenges

The project was designed around four core objectives:

Significantly reduce dependence on the power grid

Optimize the use of solar power and battery storage to meet the majority of daily household energy needs, especially during nighttime and peak hours.
Reduce long-term household electricity costs

Significantly lower monthly electricity bills through on-site power generation and consumption, targeting savings of approximately 80% annually.
Ensure reliable performance in an urban environment

The system must operate reliably in a residential urban setting, considering factors such as shading from nearby buildings, frequent rainfall, and limited installation space.Hệ thống phải vận hành tin cậy trong môi trường nhà phố, với các yếu tố như che bóng từ công trình lân cận, thời tiết mưa nhiều và không gian lắp đặt hạn chế.
Seamless integration with household electrical loads

Reliably power essential household appliances such as air conditioning, lighting, kitchen appliances, and everyday electrical loads without disrupting the family’s daily experience.

Site-Specific Challenges

Time-concentrated household electricity consumption: Household electricity demand primarily occurs in the evening and at night, requiring greater reliance on battery storage to reduce load on the national power grid.
Limited rooftop space in an urban environment: Installation space is constrained by townhouse structures and surrounding buildings, requiring high-efficiency solar panels and precise layout design to maximize energy output.
Shading from neighboring buildings: Surrounding structures may cause partial shading throughout the day, necessitating equipment capable of stable operation and minimizing performance losses.
Weather conditions in Da Nang: The system must maintain stable operation during the extended rainy season, with high humidity and fluctuating sunlight hours, requiring a well-balanced combination of solar capacity and storage size.

Want to turn your home into a powerful energy source?

Get a Free Consultation

Energy Modeling and System Sizing

LenX Energy analyzed the household’s electricity consumption data to design a 7.74 kWp hybrid solar power system, configured to maximize self-consumption, maintain efficiency during the rainy season, and meet both current and future energy needs.

System Architecture

Solar Array: 12 LONGi Hi-MO 10X 650 W panels, delivering high efficiency, strong low-light performance, and stable operation in tropical conditions.
Hybrid Inverter: One 6 kW hybrid inverter that simultaneously manages power from solar panels, battery storage, and the grid, optimizing on-site energy usage.
Battery Bank: One 14.3 kWh lithium battery system integrated with a Battery Management System (BMS), ensuring safety, performance, and long-term durability.
Energy Management: An intelligent monitoring system enables real-time tracking of energy production, consumption, and battery status, supporting proactive operation and maintenance.

Installation & Commissioning

Mounting Structure: Custom-designed aluminum mounting frames tailored to townhouse roof structures, ensuring optimal tilt angle, proper ventilation, and aesthetic integration.
Electrical Works: Installed in compliance with IEC standards and Vietnamese electrical regulations, with full integration of protection and lightning arrest systems.
Testing: Commissioning tests confirmed inverter synchronization, proper load distribution, and stable system response during grid disturbances.

Performance & Results

The hybrid solar power system in central Da Nang delivered clear and measurable results:

Significant reduction in grid dependence: Most household electricity demand is met by solar power and battery storage, with the grid serving only a supplementary role.
Approximately 80% reduction in electricity costs: Monthly power bills are significantly lowered through optimized self-consumption and battery usage during peak hours.
Rainy-season ready: The 14.3 kWh battery storage ensures stable power supply at night and during extended periods of cloudy or rainy weather.
Seamless automated operation: The hybrid inverter automatically switches between power sources without disrupting household activities.
Instant source switching: The hybrid inverter transitions between energy sources instantly, with no downtime.
Smart monitoring: The system enables real-time tracking of energy production, consumption, and battery status via LenX Energy’s monitoring platform.

Estimated Annual Performance Metrics:

Annual energy production: 11,000–12,500 kWh
Average daily energy output: 30–35 kWh/day
Self-consumption rate: 80%
Grid dependency: 10–20%

Conclusion

Beyond delivering direct benefits to the homeowner, this project clearly demonstrates the strong potential of solar power combined with battery storage in Da Nang’s urban environment. Over its estimated 25-year operational lifespan, the system is expected to significantly reduce CO₂ emissions, making a meaningful contribution to clean and sustainable energy goals for central urban communities.

The 7.74 kWp hybrid system implemented for this project represents a modern approach to residential solar energy: efficient, intelligent, and focused on self-consumption. Through precise engineering design, careful selection of high-quality equipment, and a rigorous installation process, LenX Energy enabled the home to achieve impressive electricity savings and enhanced energy independence and become a practical reference model for urban households in Vietnam.

Ready to take control of your energy future?

Whether you are a homeowner, business, or industrial facility, LenX Energy delivers smart solar energy solutions tailored to your needs.