Components of photovoltaic system
1.PV system components PV system consists of the following important parts. Photovoltaic modules are manufactured from photovoltaic cells into thin film panels placed between the encapsulation layer. Inverter is to reverse the DC power generated by the PV module into grid-connected AC power. The battery is the device that chemically stores direct current (DC) power. Photovoltaic mounts provide support for positioning the PV modules.
2. Types of PV systems can be broadly classified into two types. Grid-connected system: the advantage of this type of system is that no battery storage, directly connected to the national grid, do not have to worry about power outages; off-grid system: off-grid system requires a battery to store energy, so the cost will be relatively high.
Examples of grid-connected systems and off-grid systems are shown in comparison:
Photovoltaic system wiring:
1. PV system series-parallel connection PV modules can be connected in parallel or in series according to the requirements, and can also be connected in series-parallel mixture. For example, 4 12V PV modules are used to design a 24V off-grid system: 16 34V PV modules are used to design a grid-connected system consisting of two series parts.
2. Connecting components for inverter models. The number of components that can be paired for various models of inverters is certain, and the number of connections for each group of components can be allocated according to the number of inverter branches, as shown in the figure:
3. Inverter connection method DC circuit breaker and AC circuit breaker should be installed at the DC input and AC output of the inverter respectively. If there are more than one group of inverters to be connected at the same time, the DC terminal of each group of inverters should be connected to the module separately, and the AC terminal can be connected to the grid in parallel, and the cable diameter should be thickened accordingly.
4. AC terminal grid connection is generally connected to the grid by the power supply company, the installation unit only needs to reserve the AC terminal in the meter box, and install the disconnect switch. If the owner does not use the grid or has not been approved for grid connection. Then the installation unit needs to connect the AC end at the lower end of the power inlet switch. The user will need a three-phase inverter if he is connected to three-phase power.
Bracket part:
The bracket of cement flat roof cement flat roof can be divided into two parts, one is the base part of the bracket and the other is the bracket part. The base of the bracket is made of concrete with the standard C30. The brackets produced by different manufacturers are different, and the applicable brackets are different according to the unique conditions of the site. First of all, it is convenient to understand the common bracket materials and the shape of each part for quick installation of brackets.