Is the short-circuit current of photovoltaic panels the same as the maximum operating current?

Introduction Is the short circuit current of the photovoltaic panel the same as the maximum operating current? Determined by the characteristics of the photovoltaic module itself, the short circuit current of the solar photovoltaic module is only slightly higher than

Is the short-circuit current of photovoltaic panels the same as the maximum operating current?

Not the same size. Due to the characteristics of the photovoltaic module itself, the short circuit current of the solar photovoltaic module is only slightly higher than the operating point current. When the photovoltaic module is short-circuited, it will not damage the circuit. Short circuit current refers to the current flowing through both ends of the photovoltaic cell when the output of the photovoltaic cell is short-circuited under illumination from a standard light source.

Why should we measure and study the open circuit voltage and short circuit current of solar cells?

1. The voltage of a single solar cell is generally 0.4-0.7V. A common solar cell module is composed of 36/54/60/72/96 cells connected in series, and the voltage is 0. 4 ~ 0.7 V. 18/27/30/36/48 volts approximately.

2. It should be noted that the voltage of small cells dividesés is always the same as that of a single cell. -

3. Since they are connected in series, the current from the monomer and components is typically 4 to 5 amps for 5-inch cells and 7 to 8 amps for 6-inch cells.

Detailed information:

< p>1. Solar cells are devices that directly convert light energy into electrical energy by photoelectric effect or photochemical effect. Crystalline silicon solar cells that work with the photoelectric effect are the most widespread, while thin-film cells that work with the photochemical effect are still in their infancy.

2. A solar cell is a photovoltaic component that can convert energy. Its basic structure is formed by joining P-type and N-type semiconductors. The most basic material of the semiconductoris "silicon", which is non-conductive, but if different impurities are mixed in the semiconductor, it can be transformed into P-type and N-type semiconductors, and the P-type semiconductor then has a hole.

3. Compared to N-type semiconductors, there is an additional potential difference between free electrons to generate current. Therefore, when sunlight shines on them, the light energy excites the electrons in the silicon atoms, thereby generating electrons. and by convection, these electrons and holes are affected by the built-in potential, are attracted by the N-type and P-type semiconductors respectively, and gather at both ends.

4. At this point, if the exterior is connected with electrodes, a loop is formed. This is the principle of energy production by solar cells.

1. Open circuit voltage

(1), open circuit voltage UOC: i.e. que the solar cell is placed in AM1.5 spectrum conditions and a light source intensity of 100 mW/. cm2, and open circuits at both ends When, the output voltage value of the solar cell.

2. Short circuit current

(1) ISC short circuit current: The solar cell is placed under AM1.5 spectrum conditions and a light source intensity of 100 mW/cm2. At Output End The value of current flowing through both ends of the solar cell during a short circuit.

3. Maximum output power

(1) The operating voltage and current of the solar cell change with the load resistance. The operating voltage and current values ​​corresponding to different resistance values. Are Make a curve to obtain the solar energy Volt-ampere characteristic curve of the battery.

(2) If the selected load resistance value can maximize the prproduct of output voltage and current, the maximum output power can be obtained, represented by the symbol Pm. The working voltage and working current at this time are called optimal working voltage and optimal working current, which are represented by the symbols Um and Im, respectively.

References:

Baidu Encyclopedia - Solar Cells

The main thing is to obtain the equivalent circuit of the solar cell. With the open circuit voltage and short circuit current, we can divide the open circuit voltage by the short circuit current to get the equivalent resistance of the battery. In this way, the battery can be equivalent to a voltage source and a resistance in series. The voltage of the voltage source is equal to the open circuit voltage, its series resistance is equal to the equivalent resistance.

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