How should the snow on the solar power station be cleaned up?

- Dec 10, 2018-

Recently, the north has ushered in snowfall. So what do you need to pay attention to in your home on the snowy days?


Can solar panels still generate electricity on snowy days?


In this regard, Joshua Pierce, an associate professor at Michigan Technological University, said: "If the snow completely covers the panel, only a small part of the sunlight passes through the snow and shines on the solar panel, so the energy generated is obviously less."


He added: "Even if there is only a small amount of snow on the panel, it will greatly reduce the amount of power generated by the entire system."


Regarding these issues, research is currently underway on whether solar panels can continue to generate electricity in a cold climate.


It is expected that the loss will affect the energy expenditure of solar energy users, but it will only have a serious impact on those users who rely entirely on solar photovoltaic power generation and have not realized traditional grid-connected power generation.


For most households and businesses that still have grid supply, the economic impact is still very limited. But energy loss is still a problem in improving the optimal use of solar energy.


The study also included the positive impact of snowy weather on solar panel formation.


"When the snow falls on the ground and the panels are not covered by anything, the snow on the ground is like a mirror that emits sunlight back, so the power generation of the panels will increase," Pierce said. "In many cases, he reflection of snow will promote photovoltaic power generation."


How can I install snow protection?


There are two things to remember. One is to install the solar panels at the best angle. This can reduce the accumulation speed of snow and eliminate the trouble of cleaning up snow from time to time. If your PV panels are spread out on the ground, think about the snow or pollutants that will stay on the PV panels for a long time, and you won't slip.


Second, the installation is kept a little distance from the ground, and the snow will not accumulate at the bottom when it slides down, so that it slowly accumulates and covers the entire battery assembly.


How to clean up snow


If there is heavy snow on the components after the snow, it needs to be cleaned. You can use soft objects to push the snow down, taking care not to scratch the glass. The components are load-bearing, but they cannot be stepped on the components, which may cause the components to crack or damage and affect the life of the components. It is generally recommended not to wait for the snow to be too thick and then clean to avoid freezing the components.


In many cases, the reflection of snow will contribute to photovoltaic power generation. If the snow does not cover the components, the snow on the ground will emit sunlight like a mirror, so the power generation will increase. However, if the snow covers the components completely, only a small part of the sunlight will pass through the snow to the photovoltaic modules, which will affect the photovoltaic power generation.


The relationship between the thickness of snow and the load:


1 square meter * 10 cm = 25kg


1 square meter * 20 cm = 50 kg


1 square meter * 30 cm = 75 kg


100 square meters * 30 cm = 7.5 tons


At present, the design load of the roof of the steel structure factory is generally within the range of 30~50kg.



Cleaning up snow cover


Be sure to pay attention to the use of soft objects to prevent scratching the glass and reduce the amount of light transmission of the battery components;


It must be noted that hot water can not be poured into the surface of the battery board, and uneven heat and cold will seriously damage the panel surface;


Be sure not to step on the component to clean the panels. The component has certain bearing requirements, which may cause the component to crack or damage and affect the life of the component.


Be careful not to wait for the snow to be too thick and then clean to avoid freezing the components.


Be sure to clean the snow, don't look down on the snow. If there is only one small strip of snow on the battery board, it should be cleaned up, and the blocked panel will be completely ineffective, resulting in a significant reduction in power generation efficiency of the inverter.