EVN Compliance for Rooftop Solar Systems

Installing a rooftop solar PV system is only half the journey. To be energized and legally operated, the system must be capable of “communicating” with EVN load dispatch centers.

Challenges facing your business

  • Non-Compliance Means No Energization

    Decision 378/QD-EVN specifies technical requirements for data monitoring, acquisition, and transmission in grid-connected solar PV systems, while Decree 58/2025/ND-CP establishes the legal framework for self-generation and self-consumption models.

    Systems failing to satisfy the required signal list and communication protocols will not pass grid connection acceptance testing — leaving the entire solar investment idle, creating legal compliance risks, and delaying clean energy commitments made to parent companies or clients.

  • Inverters on One Protocol, EVN Dispatching on Another

    Equipment within a solar PV system — inverters, meters, and protection devices — typically communicates via Modbus TCP/IP using vendor-specific data structures, whereas connecting to the load dispatch system mandates the IEC 60870-5-104 standard.

    Without a proper protocol conversion layer, system owners face a situation where equipment operates normally, yet data fails to reach its intended destination or arrives with incorrect formats and signal lists — leading to endless troubleshooting without identifying which layer is at fault.

  • Mỗi tuần chậm đóng điện là một tuần mất sản lượng

    Hệ thống điện mặt trời đã lắp đặt xong nhưng chưa được phép vận hành thì không phát được kWh nào - khoản khấu hao và chi phí vốn vẫn chạy trong khi sản lượng bằng không.

    Với hệ thống hàng MWp, giá trị sản lượng mất đi mỗi tuần chậm trễ là con số đáng kể. Chưa kể chi phí huy động lại nhà thầu, chỉnh sửa hệ thống nhiều vòng khi hồ sơ kỹ thuật bị trả về ở khâu nghiệm thu

Technology Driven by Hino Systech Systems

Our approach

  • 1

    System Alignment with EVN Requirements

    Hino engineers review the actual solar PV system configuration — including inverter models, metering equipment, and protection devices — and cross-reference them against the signal and data transmission list mandated by Decision 378/QD-EVN alongside regional dispatch requirements.

    The result is a clear list of technical gaps to address before submitting for acceptance testing, preventing non-compliance issues from being uncovered during the actual inspection.

  • 2

    Hino Gateway 378 — The Protocol Translator Between Plant and Dispatch Center

    Hino Gateway 378 reads data from multi-vendor inverters and field devices via Modbus TCP/IP, converting and transmitting it to the load dispatch system under the IEC 60870-5-104 standard. A single device fulfills the complete role of a protocol bridge: aggregating signals from multiple inverters, standardizing the data list according to grid connection requirements, and maintaining a stable communication channel — serving as the decisive technical layer that determines whether the system can "communicate" with EVN.

  • 3

    Operational Monitoring and End-to-End Support Through Energization

    Hino's SCADA/OCC system monitors all operating parameters of the solar PV system — power output, voltage, frequency, and equipment status — in parallel with data transmitted to the load dispatch center.

    Hino collaborates with system owners and the power utility throughout testing, commissioning, and grid connection acceptance, addressing any adjustment requirements that arise until the system receives official operational approval.

EVN Compliance for Rooftop Solar Systems

New Operating System

Hino Systech Data Collection & Control Architecture

Hino Systech system solution details

  • Japanese Engineering Standards

    Hino Systech Vietnam is a 100% Japanese-owned enterprise, backed by over 70 years of expertise from Hino Systech Group Japan (established in 1950) alongside more than 10 years of operational track record in Vietnam, supported by a team of over 20 engineers trained directly in Japan.

    In solar grid connection, this experience is proven through real-world projects: at TMVN Ninh Binh (1,375 kWp), the Hino-implemented system achieved full grid connection with EVN within 3 weeks — demonstrating a right-first-time approach to technical configuration and documentation preparation.

  • A Seamless Engineering Pipeline from Inverters to Load Dispatch

    The complete connection chain — field signal acquisition, protocol conversion via Hino Gateway 378, monitoring via SCADA/OCC, and data transmission compliant with IEC 60870-5-104 — is designed, installed, and delivered under single-source accountability. When adjustment requests arise from dispatch authorities, issues are isolated and resolved through a single point of contact, eliminating finger-pointing among inverter vendors, installation contractors, and software developers.

    This capability has been deployed across various project scales: from the solar PV–generator–grid hybrid system at Sapporo Long An (~706 kWp) to large-scale installations such as LuxShare ICT (~20,048 kWp) and Vikohasan Ha Nam (3,200 kWp).

  • On-Schedule Energization, Data-Driven Operations

    The most direct benefit of right-first-time compliance is schedule certainty: the sooner the system receives operational approval, the earlier solar generation begins delivering value.

    Post-energization, the SCADA/OCC infrastructure continues to support long-term operations — tracking actual output against design targets, detecting performance degradation or equipment faults early, and supplying clean energy generation data for internal reporting. A single infrastructure investment satisfies both regulatory compliance obligations and asset optimization goals.

Get a Power-Quality Survey & Switchboard Design Quote

Optimize your plant's energy costs today with a smart power-factor correction system. Hino Systech's expert engineers will run an on-site measurement survey and propose the optimal technical plan — completely free.

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