What issues should be paid attention to during the installation of solar photovoltaic power generation system
1. Install solar cell array
Careful selection of the location of the solar cell array is the first step in completing the installation of the photovoltaic system. Electrical equipment should be protected from unnecessary exposure outdoors, and installation of electrical equipment should be considered for easy system maintenance. The PV array should be as close as possible to the battery and power conditioning equipment to minimize lead distance and reduce line losses.
A simple, rugged, and durable mounting structure should be provided for the support frame of the battery assembly. The material used to manufacture the battery square frame bracket should be able to withstand the erosion and various corrosion of wind and rain. Electroplated aluminum profiles, galvanized steel and stainless steel are ideal choices. The square frame brackets are light enough to be transported and installed.
2. install the battery
(1) Safety first. The installation of the battery system should be planned from the start of transportation. The battery is heavy and the acid is easily leaked. Therefore, when transporting batteries with electrolyte reserves, pay special attention to safety and reliability. After the battery is delivered to the site, first check whether the battery has been damaged during transportation.
(2) Install the battery essentials: use the special connection screws and washers prepared by the battery manufacturer; select the battery wires and fuses of the appropriate specifications; install the fuses on the positive wires; use stainless steel nuts and nuts; all battery terminals and terminals They are covered with terminal covers or covered with virgin oil and high temperature grease to prevent the terminals from being eroded by acid or acid mist.
Ventilation equipment must be installed in the battery compartment, and the ventilator should be placed high enough to discharge hydrogen lighter than air. Fans and switches should be placed outside the battery. In areas where the minimum temperature in winter is not lower than -10 °C, the battery can be placed in an outdoor battery box. The battery box should be protected from corrosion, the air can be circulated, and a safety fence should be placed around it.
3. install the controller and inverter
Photovoltaic system controllers are usually dedicated to a system and cannot be used in any other system unless explicitly stated by the manufacturer. PV power system installers should read and follow the manufacturer's instructions for proper installation procedures. When installing the controller, the solar cell array is covered with an opaque cloth cover and the load is disconnected to protect the equipment and installers. The installer should keep in mind that the electrical equipment is a sensitive component and needs to be moved carefully. The controller should be installed in a well ventilated position to prevent excessive heat dissipation.
The controller metal case is a protective case designed for electrical components and wiring. The controller is placed in the box to prevent the entry of dust, moisture and foreign matter. When the metal case is grounded, the operator is protected from clicks.
The precautions for installing the inverter have many similarities to the installation of the controller. It should be specially pointed out that when connecting the DC cable to the input of the inverter, it is necessary to pay attention to determine the polarity and confirm that the positive and negative polarity are correct.
According to the different requirements of photovoltaic systems, the functions and characteristics of controllers and inverters produced by various manufacturers are different. Therefore, the controller and inverter must be wired and debugged. For details, please refer to the technical documentation that is carried with the device.
4. photovoltaic system wiring
(1) Connection of wires. All connections to the PV system must be routed in the nearest electrical junction box. The electrical junction box can be placed or embedded in a wall, ceiling or floor. Open-air electrical junction boxes must withstand wind and rain. When the wiring needs to be changed frequently or when the large diameter wire is difficult to connect, the wire end should be crimped to the copper terminal ring or the wiring fork. The connection between the wires, cables or conduits and the electrical junction box must be reliable enough to prevent the wires from becoming loose during dragging. If the junction box is open-air, each connection point must be carefully threaded into the junction box and sealed against water. Outdoor wires can only be connected on the underside of the junction box.
(2) Install the socket and switch. When connecting the socket and the connector, pay special attention to the characteristics of DC and AC; when wiring the DC system, pay attention to the positive and negative polarity of the wire and the terminal; when wiring the AC system, pay attention to the fire line, neutral (zero) line and Ground wire. Proper wiring prevents damage to the equipment, eliminates fire and reduces the risk of electric shock.