Photovoltaic Grid-Connected Equipment Installation Standards

Photovoltaic mounting systems can be categorized into three types based on their installation method: welded, modular, and hybrid. For welded bracket installations, the contracting unit must have a corresponding welding quality management system and comply with relevant technical standards. During installation, safety measures must be strictly enforced, and operations should be avoided in adverse weather conditions—specifically, outdoor high-altitude work is prohibited during rain, snow, or winds of Force 4 or higher. ：

• Electrical installation should be carried out after the photovoltaic支架 have been installed, with priority given to mounting the PV modules. During connection, ensure the reliability of electrical links and verify that grounding for equipment such as the grid-connection box and inverter meets the required standards. Additionally, the grid-connection box must have a clearly visible disconnection point from the power grid, and electrical isolation should be achieved using devices like transformers. : Complete design documents must be available and have passed review, and grid connection procedures, construction organization designs, or construction plans should also be approved. Ensure that the equipment installation manuals are ready.

• Personnel Qualifications : Installers must undergo training and pass the assessment; additionally, those performing specialized tasks are required to obtain the corresponding special operation certification before taking up their posts. The construction site must be properly isolated into designated work areas, with electrical safety signs clearly displayed.

• Construction Conditions : Conditions such as buildings, site facilities, power supply, and road access must meet the requirements for normal construction. Reserved foundations, openings, and other installations must comply with the design drawings and have passed inspection.

Installation process ：

• Bracket Installation Photovoltaic mounting systems can be categorized into three types based on their installation method: welded, modular, and hybrid. For welded支架 installations, the contracting unit must possess a corresponding welding quality management system and adhere to relevant technical standards. During installation, safety measures must be strictly implemented, and operations should be avoided in adverse weather conditions—specifically, outdoor high-altitude work is prohibited during rain, snow, or winds of Force 4 or higher.

• Electrical Installation Electrical installation should be carried out after the photovoltaic支架 have been installed, with priority given to mounting the PV modules. During connection, ensure the reliability of electrical links, and verify that grounding for equipment such as the grid-connection box and inverter meets the required standards. Additionally, the grid-connection box must have a clearly visible disconnection point from the power grid, and electrical isolation should be achieved using devices like transformers.

• Equipment Installation : The inverter should be installed upright with adequate operational clearance, at an installation height of no less than 1.8 meters, and its enclosure must be properly grounded. Additionally, the grid-connection box’s enclosure should have a protection rating of at least IP54, be mounted at a height of no less than 1.8 meters, and ensure proper grounding.

• Grounding measures Photovoltaic modules and mounting structures must be reliably grounded. In the case of box-type substations, the grounding system and neutral wire share a common grounding grid, which should be buried deeply and securely connected to the substation.

• Safety Sign The enclosures of grid-connected boxes and other equipment are equipped with locking mechanisms, as well as dedicated labels and indicative text and symbols.

Follow-up work ：

• Check and debug : Conduct systematic inspection and debugging according to the current national standards, including wiring checks, equipment installation inspections, protective device evaluations, grounding wire inspections, insulation performance tests, and grid-connected operation checks, among others.

• Trial Run After completing the connection and debugging, proceed with a trial run, measuring technical data such as input, output voltage, current, and power to ensure they meet the design specifications.

• Acceptance Test : Grid connection inspection requires providing the construction unit’s qualifications, details of major equipment, the project commissioning and acceptance report, as well as electrical testing and debugging records.