Home photovoltaic

The home photovoltaic solution aims to provide clean and sustainable electricity for household users, fully utilizing spaces such as roofs and balconies to convert solar energy into electricity, meeting daily household electricity needs. At the same time, excess electricity can be connected to the grid for sale, increasing household income, improving household energy self-sufficiency, reducing dependence on traditional power grids, and contributing to environmental protection.

1. System Design

（1） Venue evaluation

Conduct a detailed survey of the area, orientation, inclination, and obstruction of the user's roof. Generally speaking, the larger the roof area, the more photovoltaic modules can be installed, and the higher the power generation. For example, a flat or sloping roof facing south without obvious obstruction is ideal, and a sloping roof angle within ± 10 ° of the local latitude can achieve good power generation efficiency.

（2） Component selection

Choose high-efficiency and high-quality photovoltaic modules, such as monocrystalline silicon modules, which have high conversion efficiency and stability, and can stably generate electricity under different lighting conditions. Determine the number and power of modules based on the roof area and household electricity demand. Common household photovoltaic module powers include 300W, 350W, 400W, etc.

 （3） Inverter selection

A string inverter can be used, which has multiple MPPT functions and can effectively address issues such as component obstruction and inconsistent orientation, thereby improving power generation efficiency.

The power of the inverter should be reasonably matched according to the total power of the photovoltaic modules, generally 1.1-1.2 times the total power of the modules.

（4） System architecture

Adopting a grid connected system architecture, the direct current generated by photovoltaic modules is converted into alternating current through inverters, and a portion is used for internal household loads. The excess electricity is metered by an electric meter and integrated into the power grid. The system should also be equipped with a distribution box to protect and control the circuit, ensuring safe and stable operation of the system.

2. Program features

●Low investment

Diversified product series, supporting 10% overload and screenless design, effectively reducing the initial investment of the system.

●High returns

The maximum efficiency is 98.2%, the efficiency in China is 97.7%, and the MPPT conversion efficiency of 99.5% ensures reliable returns throughout the entire lifecycle

●Maintain commitment

The standard 5-year warranty period, optional 10-year extended warranty service, and intelligent operation and maintenance platform effectively provide maintenance commitments throughout the entire lifecycle.

●Intelligent

Photovoltaic inverters can be connected to Zhengtai Cloud through GPRS or 4G modules, and end users can centrally monitor the system through smart terminals such as mobile phones.

3. Profit analysis

（1） Spontaneous self use to save electricity costs

The use of photovoltaic systems in households reduces the amount of electricity purchased from the grid, which can save a considerable amount of electricity expenses based on local residential electricity prices. For example, if an ordinary household consumes 300 kWh of electricity per month and installs a 5kW photovoltaic system, and the system generates 600 kWh of electricity per month for self use, it can save about 150 yuan in electricity bills per month (assuming a residential electricity price of 0.5 yuan/kWh).

（2） Revenue from surplus electricity connected to the internet

The excess power generation can be integrated into the grid to generate electricity sales revenue. The electricity prices for surplus electricity in different regions may vary, taking the above example as an example.

4. Installation and Maintenance

（1） Installation process

1）After the design scheme is determined, carry out roof waterproofing treatment (if necessary), install photovoltaic brackets, ensure that the brackets are firmly installed and the angle meets the design requirements.

2） Install the photovoltaic modules on the bracket, connect the cables between the modules, and pay attention to the reliability and waterproofness of the cable connections.

3） Install inverters and distribution boxes, connect and debug circuits to ensure that the system can generate electricity and connect to the grid normally.

4） After installation, apply for grid connection acceptance to the local power department, and officially connect to the grid for power generation after passing the acceptance.

（2） Key points of operation and maintenance

1） Establish a remote monitoring system to monitor the power generation, voltage, current and other parameters of the photovoltaic system in real time, and promptly detect potential faults.

2） Regularly clean photovoltaic modules, generally at least once a quarter, to remove dust, leaves, and other obstructions on the surface of the modules and improve power generation efficiency.

3） Check the operating status of inverters, distribution boxes, and other equipment to see if there are any alarm messages. Regularly maintain the equipment, such as tightening cable connections and inspecting cooling fans.

4） Pay attention to local weather changes, and check the system before and after severe weather (such as rainstorm, gale, blizzard, etc.) to ensure the safety of the system.