Top 6 reputable solar power system design and consulting units in 2026

The shift towards green energy is an inevitable trend in Vietnam. To ensure that solar power systems operate safely, optimize efficiency, and stay durable over many years, the initial survey and technical drawing setup step plays an extremely crucial role. The article below will comprehensively analyze the market and summarize the list of leading reputable solar power system design and consulting units currently, helping businesses and households optimize costs and make the most accurate investment partner choices.

Trends in using solar power in Vietnam currently

Entering 2026, the trend of using solar power in Vietnam has undergone profound transformations in both technical nature and investment purposes. Therefore, the role of reputable solar power system design and consulting units is increasingly important as the market no longer relies on subsidized feed-in tariffs, but is shaped by the following practical drivers:

• Shifting towards self-production and self-consumption: Investors focus on optimizing the generated electricity output to directly serve living activities and manufacturing, instead of investing to sell electricity like in the previous phase.
• Pressure to meet ESG standards: Factories and industrial parks accelerate the use of solar panels to reduce carbon emissions, aiming to overcome strict export barriers such as Europe’s CBAM mechanism.
• Optimizing grid power costs: In the context of frequently fluctuating and rising electricity prices, self-controlling local energy supplies helps businesses save operational costs to the maximum.
• Ensuring household energy security: Increased awareness of power stability makes solar power an essential standard in residential architecture and smart cities.

Top 6 reputable solar power system design and consulting units in Vietnam in 2026

NLT Group

Nam Long Technology Investment Group (NLT Group) is one of the reputable solar power system design and consulting units thanks to the strong application of digital solutions into the workflow. The enterprise’s strength lies in its capacity for infrastructure survey and site plan layout optimization, ensuring synchronization with the overall electromechanical system of the project.

NLT Group’s design drawing profile always comes with a visual management solution integrated on Mobile App and Web Dashboard. This system helps investors easily monitor remotely, track consumed electricity output, and proactively grasp the operational status of the entire system in real time.

• Address: 43R Ho Van Hue, Duc Nhuan Ward, HCMC
• Hotline: 0911 379 581
• Website: https://nlt-group.com/

DAT Solar (DAT Group) 

Owning more than 19 years of experience in the automation and renewable energy industry, DAT Solar is currently a reputable solar power system design and consulting unit with a comprehensive product ecosystem. The enterprise scores points thanks to its large-scale equipment supply capacity as a strategic partner of Canadian Solar, Sungrow, INVT, along with a methodical engineering team capable of optimizing complex technical configuration problems for large-scale industrial projects nationwide.

• Address: B163 Nguyen Van Qua, Dong Hung Thuan Ward, District 12, Ho Chi Minh City.
• Website: https://datsolar.com/

Vu Phong Energy Group 

Vu Phong Energy Group is a long-standing reputable solar power system design and consulting unit, outstanding in its role as an EPC general contractor and provider of professional operation and maintenance services. The enterprise is particularly strong in dual transformation and Net-Zero solutions for the textile, garment, and footwear industries with the “Zero Capex Solar” model (requiring no upfront investment through international funds), helping investors use clean energy without bearing initial financial pressure.

• Address: No. 19 D8 Street, Caric Residential Area, An Khanh Ward, Thu Đức City, Ho Chi Minh City.
• Website: https://vuphong.vn/

SolarBK 

As one of the pioneers in the domestic renewable energy industry, SolarBK confirms its position as a reputable solar power system design and consulting unit with a synchronously integrated value chain. From self-controlling the research and production of international-standard panels to the capacity to self-design technical solutions, the enterprise brings high optimization to projects and is currently a trusted partner of many large corporations, businesses, and key national defense and security projects.

• Address: 13th Floor, Vincom Center Building, 72 Le Thanh Ton, Ben Nghe Ward, District 1, Ho Chi Minh City.
• Website: https://solarbk.vn/

Lithaco

Lien Thanh Vietnam Mechanical and Electrical Joint Stock Company (Lithaco) is a reputable solar power system design and consulting unit specializing in the segment of solar power combined with energy storage and electric vehicle charging stations. Originating from a team of mechanical and electrical engineers rich in experience from Ho Chi Minh City University of Technology, Lithaco brings meticulous technical designs, committing to absolute safety in roof structures and loads to optimize high-quality storage solutions for villas, hospitals, hotels, and industrial factories.

• Address: 95 Street No. 3, An Lac Ward, Binh Tan District, Ho Chi Minh City.
• Website: https://lithaco.vn/

DHC Solar 

DHC Solar is a prominent brand in the Central and Southern regions, evaluated as a reputable solar power system design and consulting unit specializing in the rooftop solar segment. The enterprise’s strength lies in its flexibility, fast processing speed for requirements, and investment cost optimization for small and medium projects thanks to streamlined technical drawings that are easy to install and operate while still fully meeting strict grid-connection standards.

• Address: 133 Ho Tung Mau, Hoa Minh Ward, Lien Chieu District, Da Nang City.
• Website: https://dhcsolar.com/

Models deployed by reputable solar power system design and consulting units

Grid-tied solar power system design model

This is the most popular and cost-optimized model for factories and offices operating heavily during the daytime. The system operates parallelly with the power grid, automatically prioritizing supplying solar power to equipment and only compensating from the grid when there is a shortage.

When choosing this solution, reputable solar power system design and consulting units always have to integrate strict zero-export power limiters. This device helps control the current optimally, completely preventing the reverse flow of excess electricity output onto the national grid when not permitted.

Off-grid solar power system design model

This model operates completely separately from the power grid, using a large Lithium battery or accumulator system to store energy. This is an ideal solution for remote areas, islands, or telecommunication stations where the power grid has not reached yet.

When designing, engineers must precisely calculate the radiation amount and peak consumption capacity of the load. This helps configure the storage capacity correctly, ensuring the system supplies power continuously and is not interrupted at night.

Hybrid solar power system design model

The Hybrid model is a comprehensive solution that perfectly combines the advantages of both grid-tied and off-grid systems. The system operates parallelly with the power grid to optimize costs during the day, while integrating storage batteries to store excess electricity output.

This is currently a trend strongly deployed by reputable solar power system design and consulting units in 2026 for luxury villas and data centers. The system possesses the ability to instantly activate the backup power source when grid power outages occur, ensuring crucial devices always operate stably 24/7.

Evaluation criteria for a reputable solar power system design and consulting unit

Legal capacity and technical records reaching regulatory standards

• Practicing certificate: The contractor must have full construction capability certificates in the field of mechanical and electrical design and construction (such as Class I or Class II construction capability certificates).
• Structural appraisal: Technical design drawings must pass strict evaluation rounds of the Ministry of Construction regarding the load-bearing capacity of the roof.
• Legality and safety: Design records must strictly meet fire prevention and fighting standards and reach EVN’s technical connection and synchronization codes.

Professional qualifications of the team of experts and engineers

• In-depth technical capacity: Design engineers need to have solid knowledge to simulate currents, calculate obstacle shading, and minimize line efficiency loss to the maximum.
• Configuration optimization: The capacity to calculate accurately to select the inverter equipment and system capacity suitable for the actual load profile.
• International certificates: Priority is given to units whose personnel possess specialized renewable energy certificates issued by international organizations.

Quality of materials and equipment committed to being genuine

• Transparent origin: All input components and auxiliary materials used for the project must have full certificates of origin, quality, and testing reports from the factory.
• Panel and Inverter standards: Must achieve IEC 61215 (on design quality) and IEC 61730 (on operational safety) certificates, ensuring panels withstand wind and storm pressures and do not experience potential-induced degradation (PID) power loss.
• Grid-connection standards: The system must meet IEC 62109 and especially IEEE 1547 standards to guarantee connection protocols, frequency synchronization, and safety for the national power grid.

Technical support policies and after-sales service

• Long-term warranty commitment: A reputable design unit must commit in writing to a minimum electricity output based on simulation, guaranteeing the linear performance warranty of panels to reach over 80-85% after 25 years.
• Automated operation monitoring: Providing a monitoring system not just at the total level but deep down to each panel string, helping detect immediately which panel is faulty, dirty, or cracked through AI algorithms.
• On-site incident response: Periodic maintenance services and fast procedures to receive and process technical incidents at the site to avoid interrupting production.

Why choose NLT Group as a reputable solar power system design and consulting unit?

Mastering digitalized technology

NLT Group pioneers applying GIS geodetic data analysis systems and intelligent AI algorithms into the design process. This solution helps accurately forecast generated electricity output month by month and completely eliminate obstacle shading blind spots.

Thanks to comprehensive digitalization, technical drawings always optimize the tilt angle and sunlight-catching direction of the panels. This ensures the system operates in the highest efficiency range and minimizes current loss to the maximum.

Personalizing technical design solutions

NLT Group does not apply rigid configurations but always conducts in-depth collection and analysis of the actual electricity consumption charts of each project. As a reputable solar power system design and consulting unit, the enterprise understands that each factory roof has its own structural characteristics and load demands to offer appropriate solutions.

From there, the team of experts will propose tailored solutions fitting actual usage needs. This method helps businesses optimize initial material costs, avoid wasting excess capacity, and shorten the payback period to the maximum.

Standardized 3-stage deployment process

Every project undertaken by NLT Group strictly complies with quality control processes to ensure the highest safety and performance. The process is optimized through 3 core steps:

• Pre-construction stage: Conduct terrain geodetic surveys, inspect foundation/roof structure loads, and set up visual 3D drawing simulation records to calculate actual load-bearing capacity.
• Construction stage: Deploy the installation of the mechanical and electrical system, support frames, and panel arrays under the close monitoring of engineers, fully meeting strict technical and fire safety (PCCC) standards.
• Post-construction stage: Execute acceptance energization testing, hand over operational technology, and activate remote automatic monitoring solutions via Cloud platform.

Commitment to accompany throughout the project lifecycle

With a customer-centric philosophy, NLT Group commits to accompany businesses throughout the operational lifecycle of the system through professional after-sales services.

We bring solutions to protect your energy infrastructure with a long-term equipment warranty policy up to 25 years for panels, combined with periodic technical inspection schedules and 24/7 remote incident handling support solutions. Any arising issues are detected early and handled promptly, ensuring a sustainable green profit flow for investors.

Choosing a reputable solar power system design and consulting unit is the decisive factor for the safety, efficiency, and durable operating life of the entire work for nearly 30 years. Hopefully, with the list of Top 6 leading brands in 2026 along with the shared in-depth technical criteria, businesses and households have enough basis to find a suitable accompanying partner, thereby optimizing investment costs and standing firm on the journey of sustainable green transformation.

Nam Long Technology Investment Group (NLT Group)

• Hotline: 0911 379 581
• Email: kinhdoanh@nlt-group.com
• Tax code:: 0313339640
• Address: 43R Ho Van Hue, Duc Nhuan Ward, TP.HCM.