Factors affecting weak light response

The nameplate power of the PV modules is calibrated at a standard light intensity. However, we know that in the field of outdoor power generation, whether it is because of lighting conditions or because of the angle, it basically does not reach a standard light intensity. Therefore, the weak light response of photovoltaic modules has become a very important consideration. Under the same nameplate power generation, l channel steel components with weak light response can naturally emit more power in practical applications. This principle, I will tell you.

Factors affecting weak light response

1. Parallel resistance. Low light is the incident light intensity is relatively weak. Although it does not affect the short-circuit current, it will affect the open circuit voltage. Ideally, the open circuit voltage is in a logarithmic relationship with the incident light intensity.

In fact, considering the influence of the series-parallel resistance, in the low-light condition, the composite current and the current flowing through the parallel resistor are very important. The lower the parallel resistance, the more the voltage is turned off, and of course the filling factor is also bad.

2. Ideal factor ideality factor. Similar to the above description, the more the inter-depletion layer is compounded, the more the part of the double-diode model n=2, or the larger the value of n in the single-diode model, the worse the weak-light response.

3. Series resistance. The impact of not having 1, 2 and two factors, leading to this is often overlooked. The trend is that the larger the series resistance, the better the weak light response! If you can increase the series resistance properly, while ensuring that the fill factor does not affect the efficiency of standard test conditions, it is very powerful.

Component performance comparison:

The comparison of the weak light performance of components is basically a comparison of the above three factors. Thin-film batteries generally have better low-light response because the parallel resistance is generally large. Single crystal silicon is second. Compared with monocrystalline silicon cells, polysilicon cells have a large composite dark current, which results in a weaker light response.

Conclusion: The weak light response is a very important consideration because the standard test conditions are far from the actual lighting conditions. Thin-film batteries have a certain advantage of weak light response, so although the standard test conditions are less efficient, the overall power generation can be pulled back to a city, and it is not so unbearable. Compared with the same battery type, after improving the material quality and improving the passivation, not only can the opening pressure be increased, but also the weak light response can be enhanced.

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