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As electricity costs continue to rise and green energy becomes a popular trend, investing in solar power systems is a smart choice for households, businesses, and production facilities. However, to achieve optimal performance, calculating the correct system capacity is the most important factor. In this article, cergy.vn will guide you through determining the right capacity and choosing solar power equipment suitable for different needs—especially in regions with high solar potential such as Binh Thuan, Nha Trang, Dong Nai, and Tay Ninh. 1. Why is accurate calculation of solar system capacity important? Designing and installing a solar system is not simply about buying equipment and placing it on the roof. To ensure investment efficiency and long-term stability, accurate system capacity calculation is a critical step in the consulting and design process. Here’s why: Meeting actual electricity demandA properly sized system will generate enough electricity to power all household, business, or factory equipment—including high-consumption devices such as air conditioners, compressors, or production lines. Undersized systems force continued reliance on the grid, reducing investment value. Avoiding excess capacity – optimizing initial investmentOversized systems lead to unused electricity during off-peak hours. Without storage batteries or grid feed-in, this surplus is wasted, increasing costs without added economic benefits. Faster return on investment (ROI)A well-designed system, matched to real consumption and local sunlight, shortens the payback period. Typically, optimized systems pay off in 4–6 years and then operate with nearly zero running costs for 20–25 years. Ensuring stable and safe operationMismatched capacity can cause voltage overload, damaging inverters or household wiring. Undersized systems, on the other hand, cannot meet peak demand, especially in hot seasons when cooling and pumping systems work intensively. Adapting to local sunlight conditionsSolar radiation levels vary significantly across Vietnam. A 5kWp system in Binh Thuan may generate 15–20% more electricity than
Why must rooftop solar systems for self-consumption be registered with EVN? As electricity costs continue to rise and the trend toward green energy grows stronger, investing in solar power systems has become a smart choice for households, businesses, and production facilities. Cergy explains why even rooftop solar systems designed for self-consumption still need to be registered with EVN. Learn the reasons, legal requirements, and insights from experts and the public. According to a new proposal from Vietnam Electricity (EVN), households and organizations that install rooftop solar systems for self-production and self-consumption but fail to register or notify the authorities may face administrative penalties. How to calculate solar system capacity Why is registration of rooftop solar self-consumption systems required? 1. Ensuring electrical safety and fire protection Notification helps EVN and regulators collect accurate data, provide technical guidance, and monitor installations. This reduces risks such as: Reverse current into the grid, causing system failures. Local overloads, potentially leading to fires or explosions. Systems that fail to meet safety standards. 2. Load management and grid balance A few households may not significantly impact the system. However, if millions of households install without registration, the national grid could face severe fluctuations: Sunny days: reduced grid demand → excess supply. Stormy or rainy days: households rely on the grid again → power shortages. This forces the electricity sector to constantly maintain backup capacity, creating pressure on the system. 3. Data collection and energy policy planning Registration provides the government with accurate statistics, enabling: Rational allocation of renewable energy resources. Environmental management and risk reduction. Long-term policy support for solar power development. Community perspectives Many readers agree that registration is necessary but point out that current procedures remain cumbersome. According to Decree 58/2025, households installing rooftop solar systems for self-consumption must notify: Department of Industry
The CERGY CR-6KHB 6kWh single-phase hybrid inverter provides the optimal solution for residential and commercial solar power systems with high efficiency, flexible storage capacity and outstanding safety. The product is compactly designed, durably operated and integrated with many smart features, meeting the need for stable and economical electricity use in the green energy era. Powerful Performance The CERGY CR-6KHB supports a maximum PV input of 7.8 kW with a PV-to-AC conversion efficiency of up to 97.3%, minimizing energy loss and maximizing the utilization of solar power. With a charging and discharging current of up to 135A, the inverter ensures effective energy storage and delivers a stable power supply even during peak demand or grid outages. Flexible for Any System The product is compatible with both Lithium-ion and Lead-acid batteries within a voltage range of 40–60V, and can be easily scaled with support for parallel connection of up to 9 units. It also allows integration with generators, smart loads, and AC coupling, offering flexibility for a wide range of applications from households to farms and small industrial facilities. Safety and Durability The CERGY CR-6KHB comes with an IP65 protection rating against dust and water, ensuring reliable operation both indoors and outdoors. Multiple built-in protection features include anti-reverse, overvoltage, overcurrent, short-circuit, and DC/AC surge protection. Its compact, solid all-aluminum housing design makes it easy to transport and install while maintaining long-lasting durability. Smart and Convenient Experience An intuitive color touch LCD display allows users to easily monitor and adjust system settings, while remote monitoring support ensures full system management anytime, anywhere. The advanced intelligent cooling fan system enables stable operation within a wide temperature range from -25℃ to 60℃, guaranteeing long-term performance and efficiency. Wide Applications The CERGY 1-Phase 6kWh Hybrid Inverter is suitable for a wide range of applications such as
Why Solar Panels Are the Top Choice Solar panels are devices that convert sunlight into electricity through the photovoltaic effect then the inverter converts it into alternating current for household and business use Installing solar panels not only saves electricity costs but also protects the environment reduces pressure on the national grid and supports the trend of smart and green urban development Key benefits of solar panels include saving on monthly electricity bills especially during peak sunny seasons high efficiency and durability with conversion rates up to 20–23% and lifespan of 30 years reducing CO2 and greenhouse gas emissions increasing energy independence when combined with storage systems and providing stability during grid outages Rooftop Solar Power – Reasons Costs and Uses With rising electricity prices and increasingly complex climate change rooftop solar systems are becoming the smart choice in many provinces across Vietnam not only helping households and businesses reduce costs but also delivering long term sustainable value Vietnam has over 300 sunny days per year especially in the South making it ideal for solar energy The cost of equipment like solar panels and inverters has dropped significantly in the last five years making investment more affordable Government and EVN policies also support solar grid connections helping households recover investment faster and optimize profits Rooftop solar is now trending in residential areas factories office buildings and rural communities with high daytime electricity demand delivering benefits such as no need to change existing grid infrastructure energy independence during the day higher property value and reduced risk of local blackouts Why Choose Cergy Solar Energy in Thu Duc Cergy is a pioneer in providing and installing solar energy systems in Thu Duc with advanced technology and experienced engineers Cergy delivers a complete solution from consultation and design to installation and after sales