The Dune Villas: A Complete Off-Grid Residential Solar Energy System
Located within the prestigious Dune Villas development in Da Nang, Ian and Seounghee’s home partnered with LenX Energy to implement a modern hybrid solar system designed to minimise reliance on the utility grid and protect the household from rising electricity costs. Following a detailed site assessment and system design, LenX Energy deployed a 21.45 kWp solar and battery solution, enabling the home to operate reliably both day and night. The system delivers clean, dependable energy 24/7, with the grid retained solely as a backup source.
Key Statistics
- Location: The Dune Villas, Da Nang, Vietnam
- System Configuration: 33 × LONGi Hi-MO 10X 650 W solar modules, 1 × 15 kW hybrid inverter, 1 × 16 kWh lithium battery
- System Capacity: 21.45 kWp
- Grid Dependence Reduction: Optimised for maximum solar self-consumption, with battery storage supporting night-time use and power outages.
- Environmental Benefit: More than 230 tonnes of CO₂ offset over 25 years — equivalent to planting over 400 trees.
Why Choose LenX Energy?
LenX Energy was selected for its proven experience in delivering premium hybrid systems for villas and residences that demand high reliability. For Ian and Seounghee’s project, we did not simply install equipment. We engineered a complete energy ecosystem tailored to roof conditions, consumption patterns, and long-term energy independence goals. The LenX Energy team managed the entire process in-house, from production modelling and technical design to precision installation, system configuration, and post-installation optimisation. The result is a seamless, long-term stable system that is fully prepared for future expansion. Clients do not simply own a solar system. They own energy peace of mind.
Objectives and Challenges
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Achieve a high level of energy independence by minimising reliance on the utility grid for daily living.
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Stabilise long-term electricity costs and protect the household from continuously rising energy prices.
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Ensure uninterrupted power supply, with the system continuing to operate during grid outages through battery storage.
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Support seamless operation for a premium villa, meeting the power demands of HVAC, lighting, household appliances, and entertainment systems.
Site-Specific Challenges
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High energy demand: The villa operates multiple high-power appliances, requiring a system capable of delivering stable and continuous electricity.
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Weather variability: Rainy seasons and cloud cover require a robust solar and storage system to maintain consistent performance.
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Storage optimisation: The 16 kWh battery must be precisely configured to balance charging, discharging, and long-term battery lifespan.
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Coastal environment: Proximity to the sea requires corrosion-resistant materials and installation methods capable of withstanding high humidity.
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Energy Modeling and System Sizing
LenX Energy analysed Ian and Seounghee’s household electricity consumption data over several months to design a 21.45 kWp system tailored to lifestyle patterns, backup requirements, and long-term energy independence goals. The system was engineered to optimise production under variable weather conditions while remaining fully scalable for future expansion.
System Architecture
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Solar Array:
33 high-efficiency LONGi Hi-MO 10X 650 W modules, optimised for roof space utilisation and strong power generation under low-light conditions.
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Hybrid Inverter:
The smart hybrid inverter simultaneously manages power from solar panels, battery storage, and the utility grid to ensure maximum system efficiency.
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Battery Storage:
The 16 kWh lithium battery with integrated BMS ensures safety, long lifespan, and reliable power supply during night-time use and grid outages.
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Energy Management:
The LenX monitoring platform enables real-time tracking of energy production, consumption, and battery status.
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Structure: A corrosion-resistant aluminium mounting system specially designed for coastal environments.
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Electrical: Installed in compliance with IEC and Vietnamese standards, incorporating surge protection and multi-layer safety systems.
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Testing: The system was comprehensively tested for load balancing, grid-loss response, and battery performance prior to handover.
The system was delivered fully commissioned, ready for stable, safe, and long-term optimised operation.
Performance & Results
The hybrid system at Dune Villas has delivered clear improvements in performance, reliability, and energy independence..
Operational Results
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High energy autonomy: The home operates primarily on solar power and battery storage, with the grid serving only as a backup source.
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Significant electricity cost reduction: Monthly power bills have been reduced to a minimum, remaining close to zero for most of the year.
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Rainy-season stability: Battery storage ensures continuous power supply during night-time and periods of reduced solar production.
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Automatic switching: The hybrid system transitions seamlessly between battery, solar, and grid power without interruption.
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Smart monitoring: The homeowner can track the entire system in real time through the LenX Energy platform.
Estimated Annual Performance Metrics:
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Annual energy production: ~30,000 – 33,000 kWh
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Average daily production: ~80 – 90 kWh/day
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Self-consumption ratio: >85%
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Grid dependence: <10% (primarily as a backup source)
The system delivers long-term stability, energy independence, and full control over household electricity costs.
Conclusion
Beyond delivering direct benefits to Ian and Seounghee’s household, the Dune Villas project clearly demonstrates the potential of energy-independent residential living in Da Nang. Over its 25-year lifetime, the system is expected to reduce more than 230 tonnes of CO₂, equivalent to planting over 400 trees or offsetting hundreds of thousands of kilometres of vehicle travel.
The 21.45 kWp hybrid system represents a new generation of residential solar solutions: intelligent, flexible, and designed for long-term energy independence. Through optimised design, premium equipment selection, and precise execution, LenX Energy has transformed this home into a true model of sustainable energy living.
“We wanted a system that operates reliably without relying on the grid. LenX delivered exactly that. Everything runs smoothly and we have complete peace of mind.”
— Ian & Seounghe
This project reinforces LenX Energy’s commitment to delivering energy solutions that are not only technically advanced, but also economically and environmentally sustainable.
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