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Solar junction box and solar panel parameters and installation method

Views: 6     Author: Site Editor     Publish Time: 2021-12-01      Origin: Site

First of all, the function of the solar junction box panel is to convert the light energy of the sun into electrical energy, and then output the direct current and store it in the battery. The solar panel is one of the most important components in the solar power generation system, and its conversion rate and service life are important factors that determine whether the solar cell has use value.

Solar junction box assembly design:

Designed according to the requirements of the International Electrotechnical Commission IEC: 1215: 1993 standard, 36 or 72 polycrystalline silicon solar cells are used in series to form various types of 12V and 24V components. The module can be used in various household photovoltaic systems, independent photovoltaic power plants and grid-connected photovoltaic power plants.

Raw material characteristics:

Cells: Encapsulated with high-efficiency polycrystalline silicon solar cells to ensure that the solar panels generate sufficient power.

Glass: Low-iron tempered suede glass is used, with a thickness of 3.2mm, the light transmittance is over 91% in the wavelength range of the solar cell spectral response, and it has a high reflectivity for infrared light greater than 1200 nm. At the same time, the glass can withstand the radiation of solar ultraviolet rays, and the light transmittance does not decrease.

EVA: A high-quality EVA film layer with a thickness of 0.78mm added with anti-ultraviolet agent, antioxidant and curing agent is used as the sealing agent of solar cells and the connecting agent between glass and TPT. Has high transmittance and anti-aging ability.

TPT: The back cover of the solar cell - the fluoroplastic film is white and reflects sunlight, so the efficiency of the module is slightly improved, and because of its high infrared emissivity, it can also reduce the working temperature of the module Conducive to improving the efficiency of components. Of course, the fluoroplastic film first has the basic requirements of aging resistance, corrosion resistance, airtightness, etc. required by solar cell packaging materials.

Frame: The aluminum alloy frame used has high strength and strong resistance to mechanical impact.

Basic parameters:

Standard test conditions: irradiance=1000W/m2, battery temperature=25℃

Insulation voltage: ≥600V

Frame grounding resistance: ≤10hm

Windward pressure: 2400Pa

Fill Factor: 73%

Short-circuit current temperature coefficient: +0.4mA/℃

Open circuit voltage temperature coefficient: -60mV/℃

Working temperature: -40℃~+90℃

Component Wiring Instructions

Tools required for installation: 4 flat-blade screwdrivers and Phillips screwdrivers.

Open the PV junction box cover: Insert the M4 flat-blade screwdriver into the installation hole on the box cover according to the marking on the junction box, lift one foot gently, and then lift the four corners of the side first to open the lid. Inside the box is a wiring cover that lifts up to reveal the three wiring terminals.

Wiring of the battery board: There are positive and negative signs next to the left and right terminals, which represent the positive and negative poles of the output voltage of the battery in working state. The positive pole is connected to the positive pole according to the electricity demand, and the negative pole is connected to the negative pole. The wiring adopts the mechanical compression method. Use an M4 Phillips screwdriver to unscrew the compression screw of the terminal. After peeling the wire, pass it through the G7 cable sealing connector, insert it into the wiring hole, and press the wire tightly. After the wires are connected, cover the protective cover, use an M4 Phillips screwdriver to screw the self-tapping screws into the screw holes, and then cover the junction box cover after fixing to complete the wiring of the battery board.

Grounding of the battery board: There is a grounding screw installed on the back of the battery board, and the grounding wire can be safely grounded by fixing the grounding wire on the grounding screw.

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