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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
Introduction to Cergy Energy Technology Co., Ltd Founded in 2023, Cergy Energy Technology Co., Ltd operates in the solar energy sector in Vietnam. Cergy specializes in the official import and distribution of genuine solar products, including: Solar Inverters Solar Batteries Solar Panels (PV Modules) With the business philosophy “CERGY – Customer First, Then Energy”, we place customers at the center of all activities, committed to delivering stable, high-quality, and safe green energy solutions. Vision and Mission VisionCergy aims to become a reputable, professional, and reliable solar energy company in Vietnam, contributing to the sustainable development of the renewable energy industry. MissionCergy was established to deliver value to customers, partners, and society: For customers: Access to clean, safe, reliable solar products at reasonable costs. For partners: Joint development, maximizing profits, and enhancing business reputation. For society: Contributing to sustainable growth, reducing environmental impact, and promoting the adoption of solar power. Product Portfolio Cergy Energy Technology Co., Ltd proudly brings comprehensive solar energy solutions to the Vietnamese market, meeting the diverse needs of households, businesses, and large-scale projects. APESS 580W Solar Panel The APESS 580W solar panel applies advanced photovoltaic cell technology for high efficiency and outstanding durability. Designed with IP68 waterproof and dustproof protection, the panel ensures stable performance under all weather conditions. With a lifespan of up to 25 years, the APESS 580W is an optimal choice for both residential and industrial projects. Hybrid, Ongrid, and Offgrid Inverters (Single-Phase – Three-Phase) Cergy distributes a full range of hybrid, on-grid, and off-grid inverters from single-phase to three-phase, meeting diverse customer requirements. These products feature smart integration, stable operation, and long-lasting durability. All inverters come with a 7-year official warranty, on-site technical support, and a one-to-one replacement policy in case of manufacturing defects. This is the optimal solution for residential, business, and
On July 9–10, 2025, Solar & Storage Live Vietnam 2025 will take place at Sky Expo Vietnam – Quang Trung Software City, District 12, Ho Chi Minh City. This large-scale exhibition brings together hundreds of domestic and international enterprises in the field of solar power and energy storage. Cergy Vietnam and KNYEE Energy are proud to participate in this year’s event, introducing advanced solutions that provide customers and partners with a comprehensive view of the green energy transition in Vietnam. KNYEE Energy Booth 1D-22: A Hub of Technology and Solutions At the exhibition, Cergy and KNYYE Energy will showcase key products, including: Energy storage batteries with capacities of 5kWh, 10kWh, and 15kWh: Flexible solutions for households, helping optimize solar power usage and reduce grid electricity costs. Industrial battery cabinets: Compact design, easy installation, suitable for hybrid and off-grid systems, delivering long-term efficiency for businesses and large-scale projects. Inverter and Battery Combos: Integrated solutions that reduce investment costs, simplify deployment, and ensure stable and safe system operation. Opportunities for Connection and Collaboration at Solar & Storage Live Vietnam 2025 This event is an excellent opportunity for Cergy and KNYYE Energy to meet directly with customers and partners, while sharing our vision for the development of clean energy. With a strong commitment to providing international-standard solar and storage solutions, we believe that Solar & Storage Live Vietnam 2025 will open new opportunities for cooperation and accelerate the energy transition in Vietnam. Invitation from Cergy and KNYYE Energy We cordially invite all customers and partners to visit Booth 1D-22 at Solar & Storage Live Vietnam 2025. This will be the perfect chance to explore, experience, and discuss the latest technologies in solar power and energy storage. Cergy and KNYYE Energy – Together for a sustainable green future in Vietnam.