The Dune Villas — Complete Off-Grid Residential Solar + Battery Hybrid System
Located in Da Nang’s prestigious Dune Villas, this luxury home partnered with LenX Energy to eliminate ₫25M monthly power costs and frequent outages. Following a detailed assessment, a 35.5 kWp hybrid solar and battery system was installed, making it one of the first fully off-grid residences in the city. The system delivers clean, reliable energy around the clock, with the grid used only as backup.
Key statistics
- Location: The Dune Villas, Da Nang, Vietnam
- Set up: 55 × LONGi Hi-MO 10X 645 W panels, 2 × 15 kW hybrid inverters, 2 × 14.3 kWh lithium batteries
- System capacity 35.5 kWp
- Grid reliance reduction: 100% self-sufficient (grid backup only)
- Environmental benefit: Offsetting 390+ tons of CO₂ over 25 years — equivalent to planting 700+ trees
Why LenX Energy?
Chosen for our proven expertise in complex residential systems, LenX Energy provided a turnkey solution tailored to the villa’s high energy demands and coastal environment. Our team handled every stage — from detailed energy modeling to custom system design and on-site commissioning — ensuring seamless integration, full autonomy, and long-term reliability.
Objectives & Challenges
The project was built around four core goals:
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Achieve complete energy independence — eliminate reliance on the grid for daily operations.
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Eliminate high electricity costs — reduce monthly bills from 25 million VND to zero.
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Guarantee system reliability during extended periods of heavy rain and cloud cover.
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Integrate seamlessly with high-demand household systems, including HVAC, pool equipment, lighting, and entertainment infrastructure.
Site-Specific Challenges
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High energy consumption profile: The villa’s luxury amenities created significant and continuous load demands, including air-conditioning, pumps, and entertainment systems.
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Weather variability: Designing a system capable of maintaining autonomy through Vietnam’s rainy season required extra solar generation capacity and robust battery storage.
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Dual inverter configuration: Ensuring synchronization and balanced load distribution between two 15 kW hybrid inverters.
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Coastal environment: The villa’s proximity to the sea required corrosion-resistant hardware and careful planning to mitigate salt exposure and humidity.
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Energy Modeling & System Sizing
LenX Energy analyzed six months of data to design a 35.5 kWp system covering 120% of annual demand, allowing for cloudy days and future growth.
System Architecture
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Solar Array: 55 LONGi Hi-MO 10X 645 W panels for high efficiency, low-light performance, and temperature resilience.
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Hybrid Inverters: Two 15 kW units manage solar, battery, and grid flow for optimal energy use.
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Battery Bank: Two 14.3 kWh lithium batteries (28.6 kWh total) with BMS for safety and efficiency.
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Energy Management: Smart LenX Energy platform enables remote monitoring, analytics, and maintenance alerts.
Installation & Commissioning
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Mounting: Custom aluminum frames match roof design and ensure ideal tilt and cooling.
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Electrical: Installed to IEC and Vietnamese standards with surge protection and redundancy.
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Testing: Commissioning verified inverter sync, load balance, and grid-failure response.
Performance & Results
The Dune Villas system has delivered transformative results:
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100% self-sufficient: The villa runs fully on solar and battery power, with the grid as backup.
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₫0 electricity bills: Monthly costs dropped from ₫25M to zero, with surplus generation year-round.
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Rainy-season ready: Dual batteries ensure overnight power even with low sunlight.
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Seamless automation: Hybrid inverters switch power sources instantly with no downtime.
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Smart monitoring: Real-time tracking via the LenX Energy mobile platform.
Estimated Annual Performance Metrics:
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Annual Generation: ~52,000–55,000 kWh
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Average Daily Generation: 140–150 kWh/day
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Self-consumption Rate: >95%
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Grid Dependence: <5% (backup only)
Conclusion
Beyond individual benefits, the Dune Villas project is setting a precedent for renewable residential living in Da Nang. The system will prevent more than 580 tons of CO₂ emissions over its 25-year lifespan — equivalent to planting approximately 23,000 trees or offsetting the emissions from over 1.4 million kilometers of car travel.
The 35.5 kWp Dune Villas hybrid solar + battery system represents the next generation of residential solar architecture — large-scale, intelligent, and fully independent. Through meticulous engineering, premium equipment selection, and precise implementation, LenX Energy has transformed this home into a model of sustainable living.
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