The meaning of IV photovoltaic tester refers to current-voltage tester. According to the relevant public information query, the current-voltage tester is an instrument specially used to detect the current and voltage of solar panels. This instrument can be used to measure output power, output efficiency and battery voltage in open and closed circuit states, and can effectively monitor and adjust the performance of the battery panel.
The solar panel has different sunlight every moment, and its output voltage and current also change accordingly. What are the specific characteristics of the changes?
The common electrical performance parameters of solar cells are mainly as follows:
1. Open circuit voltage Voc
2. Short circuit current Isc
3. Maximum power point voltage Vmpp
4. Comaximum power point urant Impp
5. Fill factor FF≈ (Impp/Isc)*(Vmpp/Voc)
6. The maximum power of the Pmpp
7 module. The conversion efficiency of the module
8. curve) of the photovoltaic module
9. PV characteristics of photovoltaic modules
The peak power you are talking about is element 6, that is Pmpp
Peak The power is equal to the maximum voltage of the power point and at the maximum power point current The product of ) The obtained value
The maximum power point voltage and the maximum power point current of the solar cell under different lighting conditions and temperatures will be different
But one thing remains unchanged, that is, the maximum power of the power point is the product of the maximum voltage of the power point and the maximum current of the power point. power under current conditions
Efficiency of solar conversion is themaximum battery output power/incident light power. How to calculate incident power and maximum output power?
You are referring to the IV characteristics of solar cells: the greater the light intensity, the higher the voltage, current and power output. I will omit 2000 words here (it's a long time to talk about it, and light intensity, environment, there are many factors, so I won't explain them in detail. If necessary, go to the table of curve IV). The lower limit value can be understood as zero, because it is very small and can be understood. The upper limit value will be there in large scale installations, which prevents if the power is too high, the whole thing will be damaged if you connect the battery alone, there will be a backflow situation if you do experiments. on a single chip, just add a diode, because its unidirectional conductivityonnelle is basically workable, but if you have an assembly, don't be stupid, buddy.
The solar conversion efficiency formula. cell: efficiency = peak power/power of incident light
Wp=Wpeak, which represents the peak power of the solar cell. As the solar irradiation varies every day, the output power of the solar cell also varies, Wp represents the maximum output power. The peak solar power Wp is under standard conditions: The output power of the solar cell when the radiation intensity is 1000 W/m2, the air quality is AM1.5 and the temperature of the battery is 25℃. (These conditions are about the same as our usual sunshine conditions around noon on a sunny day.) According to the lighting conditions in Guangdong, the standard lighting duration is about 3.3 to 3.5 hours. On rainy days, solar cells canalso produce a certain amount of energy, and their power represents approximately 5 to 15% of the rated power.
Incident power refers to the effective power ultimately absorbed by the solar panel and the reflected power that is not absorbed.