Mono Solar Panel

Residential solar Energy system installation component selection

2018-08-06 11:23:09
3. Selection of photovoltaic cell components
Commonly used photovoltaic Solar cell components are classified into single crystal silicon and polycrystalline silicon.
Single crystal has the highest power generation efficiency, and can emit more electricity in the same area. It is most suitable for selecting a single crystal silicon wafer with a small mountable area, but its unit price will be higher.
The efficiency of polysilicon is second, and it is more economical to choose polysilicon with a relatively large installation area, and the price is relatively low. (Hint: the edge of the monocrystalline silicon cell is generally rounded, and the polycrystalline silicon cell is generally square, so don't be deceived by bad merchants on the market!)
The five parameters of the battery pack are peak power, open circuit voltage, short circuit current, operating voltage, and operating current. The selection of these parameters is very important.
The battery pack has a size depending on the power, and the power of the single component is from 10W to 300W. The power of a single component is proportional to the size of the area, so choose the most suitable size of the battery pack to meet your installation space requirements.

4.Selection of photovoltaic grid-connected inverter
The photovoltaic grid-connected inverter is used as an interface device between the photovoltaic cell component and the power grid, and converts the DC power of the photovoltaic cell component into AC power and transmits it to the power grid, which plays a vital role in the photovoltaic grid-connected power station.
There are two types of household grid-connected inverters. One is a centralized grid-connected PV inverter with a minimum power of 1 kW and an input voltage ranging from 150V to 550V. The other is a miniature grid-connected PV inverter, which is generally used in the AC220V voltage class, with power ranging from 200W to 500W, and input voltage ranging from 12V to 28VDC. The usage of the two grid-connected inverters is very different. The size of the centralized grid-connected inverter is generally larger for wall mounting, and the miniature grid-connected PV inverter is compact. It is generally installed near the battery pack (can be mounted on the bracket below the battery pack), and the household is distributed and connected to the grid. There are two types of photovoltaic power plants to choose from.
The main parameters of the grid-connected inverter are maximum input power, maximum input voltage, rated input voltage, starting voltage, MPPT voltage range, and output grid voltage.
The selection of the grid-connected inverter is mainly to select the rated power and the input and output voltage levels. Then the user can easily determine the input voltage range of the grid-connected inverter according to the voltage level and serial-parallel connection of the battery component selected by the user. According to the power consumption of the home, the single-phase or three-phase can be selected. Output.
For example, the peak power of the panel is 250W, the open circuit voltage is 39V, and the working voltage is 30V. To form a 2KW system, 8 battery modules need to be connected in series, then the maximum input voltage of the grid-connected inverter must be greater than 38V/piece*8 Chip = 304V, rated voltage is about 240V. Then the selected inverter should be 2000w, the maximum input and output voltage is greater than 304V, and the MPPT tracking range covers about 240. The grid-connected output selects single-phase 220V or three-phase 380V according to the specific power supply of the home. As the most important component of the whole system, the grid-connected inverter must choose the products that pass the relevant national certification CGC/CF001:2009.

5. Selection of Residential Solar Energy System other components
5.1 cable. Since the photovoltaic power generation period is 25 years, in order to ensure long-term stable operation of the system, it is recommended to use special photovoltaic cables as much as possible.
5.2 lightning arrester. The lightning arrester is different from the ordinary lightning protection device. It is necessary to select the special high-voltage DC lightning protection device for photovoltaics. Because the continuous working voltage of the common lightning protection device is AC220V or AC380V, the continuous working voltage of the photovoltaic special lightning protection device can be as high as DC1000V. It is also possible to use a conventional lightning rod for lightning protection, but to make a sufficiently reliable grounding, the grounding resistance is not more than 4 ohms.
5.3 meter. The metering power company will install two meters for the user free of charge, one is the meter that measures the amount of photovoltaic power generation, and the other is the two-way metering meter, that is, the electricity meter that the user uses and sells to the grid. In this way, users can see their daily power usage, power generation and power consumption on the grid.

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