Communicate with the homeowner about electricity demand, installation budget and subsidy policies; on-site verify rooftop conditions (e.g., rooftop type: flat/ sloped roof, load-bearing capacity, orientation and shading), record the location of the house’s grid connection point, and preliminarily calculate the installed capacity and expected power generation (e.g., a 10kW power station generates about 12,000-15,000 kWh annually).

Design a customized scheme based on survey data (including module selection, inverterconfiguration, bracket installation method—flat roofs mostly use cement counterweight brackets, sloped roofs use hook brackets), draw electrical wiring diagrams and installation layout diagrams; submit a gridconnection application to the local power grid company, and complete project filing simultaneously (registration with the development and reform commission or energy bureau is required in some areas) to ensure the scheme complies with civil building electrical safety standards.

Procure small-scale equipment suitable for household scenarios (e.g., monocrystalline silicon modules, 10-20kW string inverters, household brackets, waterproof cables), and prioritize products with household certifications (such as CQC certification); after equipment delivery, check the model, quantity and quality certificate with the homeowner together to avoid delaying the installation progress due to inconsistent quiment.

First install the bracket system-fix cement counterweights and build the bracket frame on flat roofs according to design, install hook brackets at the roof load-bearing beams for sloped roofs (to avoid damaging the roof waterproof layer); then fix PV modules on the brackets, adjust the module angle (usually local latitude ±5° in the Northern Hemisphere to maximize lighting), complete the series-parallel wiring of modules, and wrap the wiring joints with waterproof and insulating materials.

 Install the string inverter in a ventilated and shaded location (such as a balcony, garage or outdoor rainproof box), connect the DC cables between the inverter and the module array; then connect the AC side of the inverter to the household distribution box, install a bidirectional metering electricitymeter (provided by the power grid company, used to measure power generation and consumption), and ensure all electrical connections comply with the “left neutral, right live” standard, and the grounding protection device is reliable.

 Check the circuit on-off and insulation before power-on, start the inverter for single-machine commissioning (test grid-connection protection functions: such as overvoltage protection, islanding effect protection); contact the power grid company for on-site acceptance, test the system’s gridconnection stability and metering accuracy, sign the grid-connection agreement after passing the acceptance, and officially connect to the grid for power generation.

Explain daily operation of the power station to the homeowner (such as inverter start-stop, power generation inquiry via mobile APP) and safety precautions (prohibiting unauthorized disassembly of equipment, avoiding touching terminals in rainy days); hand over materials such as equipment manuals, grid-connection agreements, and warranty cards, and inform the scope of O&M services (such as response time for module cleaning and fault repair-manufacturers usually provide 5-10 years of inverter warranty and 25 years of module warranty).

 Check the circuit on-off and insulation before power-on, start the inverter for single-machine commissioning (test grid-connection protection functions: such as overvoltage protection, islanding effect protection); contact the power grid company for on-site acceptance, test the system’s gridconnection stability and metering accuracy, sign the grid-connection agreement after passing the acceptance, and officially connect to the grid for power generation.