Micromorphous Silicon (Thin Film) PV Solar Panel / Module (TUV, UL, Tandem junction)
- Thin Film Silicon Features:
Crystalline silicon photovoltaic modules lose some power-generating capability with rises in temperatures. But thin film silicon photovoltaic modules generate higher power during summer time.
Thin film silicon photovoltaic modules can deliver maximum performance during summer when the electricity is needed most for air-conditioners in houses and offices due to following characteristic.
- 1.LOW TEMPERATURE COEFFICIENT
Normally, the electricity performance of photovoltaic module is measured by STC standard. Which include strong sunlight(1000 W sunlight per square meter,1.5 A solar spectrum distributing and 25℃ solar cell temperature.)
However, the temperature of solar module, operating in the sun, can be higher than atmosphere temperature 28℃.
The temperature of solar module, which installed at the roof of building, can be even higher.
It is not unusual for the temperature of solar module to achieve 55℃.
In this case, the temperature coefficient is a very important parameter due to various solar cell technologies.
The temperature coefficient is always minus.
With the temperature increase, module power will decrease accordingly.
Temperature coefficient for thin film silicon solar cell is -0.2%/℃, and that of crystalline solar cell is -0.5%/℃.
That means, when the module is worked on 50℃ condition, compare to the efficiency reached on 25℃ test standard ,
thin film silicon solar module will lose around 5%, and the loss for crystalline will be around 12.5%.
In conclusion, even the STC efficiency of thin film silicon solar cell is lower,
the efficiency in actual operation condition is not far away to that of crystalline solar cell.
- 2.GOOD WEAK LIGHT PERFORMANCE
The performance of thin film silicon solar cell is better than that of crystalline solar cell in the weak light condition.
Normally, installed module worked in a strong light of 1000 watt per square meter is very few.
Ideally, output power of solar module should be the direct portion of the intensity of sunlight.
And thin film silicon solar cell has such characteristic,
however crystalline don’t. With a situation of sunlight of 200 watt per square meter,
output power of crystalline solar module is around 85% of it should be.
That means solar power system with crystalline solar module will not generate power in the late afternoon.
However, solar power system with thin film silicon solar cell still generates power.
Besides these features mentioned above, there is an important characteristic, lower cost, which is important for profit. When large quantity of thin film modules are used in building large scale power plant, the cost will be saved very much, compared to using crystalline silicon module. In this condition, the quality of thin film modules will never be worse than that of crystalline silicon modules.
