As we all know, the shadow shielding in photovoltaic power plants, including telephone poles, plants, bird droppings, dust, and the front and rear shielding of components, etc., how much will the power generation of the photovoltaic system change, and how much will it affect the investment income?
In the family household power station, many owners often cannot completely avoid the shadow in order to install it once, because the owners feel that the area covered by the shadow is not large anyway and will not seriously affect the power generation. But in fact, people often overlook the power of small-scale shadows.
Power loss = (3.5A-2.5A) * 600V = 600W
After exploration and calculation, it is concluded that the power of the power station is as high as 1570W due to two shadows. In addition to power loss, shadows in the photovoltaic system cause hot spots. For a long time, this will accelerate the aging of the module and seriously affect the life of the module.
How much does shadow occlusion affect investment income?
The small shadow occlusion brings 33.2% power loss to the system. So how much does this affect the investment income? Given that the experiment time of the above case is November of that year, and the shadow occlusion area in different time periods is different, we will calculate according to the 20% power loss:
Take this system of 15.12kW as an example, the subsidy standard takes the Nanhu District of Jiaxing as an example:
It is calculated that 20% power loss will affect the annual investment return rate of about 3%, extending the system's investment return period of about 2 years! Even a small area of ​​shadow occlusion is a great loss!
How to reduce the impact of shadow occlusion?
The shadow blocking is mainly due to the effects of bird droppings, dust, tree shade, etc., first of all, we can choose the appropriate location to install the photovoltaic module, try not to install the module in the sheltered place, in fact, inevitable, choose a suitable The arrangement of components can reduce the impact of shadows caused by occlusion. In daily operation and maintenance, pay attention to the cleaning of photovoltaic modules and promptly clean up foreign objects such as dust accumulation.
Considering from the system itself, the realization of multi-channel MPPT will reduce the impact of shadow occlusion. For example, the micro-inverter photovoltaic system is a fully parallel design circuit, and each component has an independent MPPT, which can achieve maximum power output, so that shadows, dust, and leaves partially block the battery panel, and there is no short board effect, eliminating the The mismatch problem caused by the different components blocking, orientation and angle has greatly increased the power generation.
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