Why does the power of finished solar cell modules seem higher than the rated power?

Introduction Why is the power of the finished solar cell module higher than the rated power? The module power is because there will be power loss when cells are assembled into large modules.

Why does the power of finished solar cell modules seem higher than the rated power?

Module power is due to power loss when cells are assembled into large modules. Different manufacturers will have different specifications, and even the same manufacturer will have different qualities.

Power is the power under ideal conditions, not the power value during actual operation. Conversion efficiency is also the ideal installation and replacement efficiency. Conversion efficiency can also be calculated as the power of the component divided by the surface area of ​​the component. Therefore, in real applications, as the lighting changes, the power value and conversion efficiency continue to change.

How to calculate the power of solar cell modules

Peak power is the most suitable power of the solar cell module under standard conditions (AM1.5, irradiance 1000w/ ㎡, 25 ℃) and corresponding to the powerthat it produces when the load is large - as well as at the maximum power the component can produce.

Peak power is an ideal value measured to measure the electrical performance of components: actual working conditions are usually not standard conditions and the load size is usually not quite adapted. Generally, the rated power of the module is not mentioned.

For a 60 cell module, the maximum power is 200W, which refers to the power of the entire module.

Currently, the only practical solar cells are silicon solar cells. For commercial silicon solar cells, the manufacturer will assign the cell a number when it leaves the factory, which corresponds to the peak power. For example, for a solar panel measuring one meter by two meters, the factory specification given by the manufacturer is 300 W. It can provide a maximum power of 300 W.Maximum output power of 300 W.

The so-called peak power of solar cells is a myth. This is actually a laboratory concept. Can the maximum power of solar cells be achieved in general applications? Yes, provided that certain small conditions are met.

1. Dry climate (not respected in many southern regions)

2. Sunny and cloudless weather ( it's not difficult)

3. The highest standard for airborne particles (meaning you've experienced it twice in your life and you want to exclaim: "It's really sunny after it rains." The clear sky is so cool)

4. Midday time (it's not difficult, but the window of time qualified is only a few hours, otherwise the air difference and spectral refraction changes must be taken into account)

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5. The panel is 90 degrees perpendicular to the lightincident from the sun (isn't it just an alignment? But you have to be diligent, you have to move it every three to five minutes)

6. The surface of the panel is maintained Excellent dissipation conditions thermal (use an electric fan? It's an almost impossible task)

7. Remove the protection on the surface of the battery panel (mainly inorganic glass or transparent organic materials, which will cause loss light about 8%)

8. The surface of the battery is clean (easy! After removing the protection on the surface of the battery plate, the surface of the battery will be naturally very clean)

9. Battery plateIt has not been exposed to the sun since it left the factory (the more it is exposed to the sun, the older it gets and the performance is lower)

9.5. And the last half, there must be one. phone number on the battery card, but you can't get itcall. It's the answering machine talking to you.

When these conditions are met, that's when you get the maximum power from your panels.

Obviously, these conditions are too harsh. So, how much peak power can solar cells achieve under normal circumstances? If conditions 1, 2, 4 and 5 above are met (there is still such a chance), the output power can reach 80% of the peak power. However, tracking the sun's rays is very tedious and requires an automatic tracking system. This is an impossible task to do manually.

Generally, battery panels installed at the best fixed angle will have a 15% discount in addition to 80%, which is 70%. If laid flat on the roof at the same angle as the roof, the efficiency is typically only 70% of the above plus 30% reduction, or only about half the maximum output.

At present, the efficiency of relatively good quality and reasonably priced monocrystalline silicon solar cells is about 15%, that is, provided that the above-mentioned peak power is basically achieved ( this condition is easy to achieve in the laboratory) Satisfied), can produce a power of 150 W per square meter. So get this type of battery, measure its net surface area, multiply it by 15% per square meter and you will get the maximum possible power output. Polysilicon and amorphous silicon are much less efficient than this figure.

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