How much electricity can a 100w solar panel generate in a day?

How much electricity does a 100w solar panel generate in a day? In fact, the power generation of 100w solar panels in grid-connected systems and off-grid systems is different. On-grid system: 100w*4.26H*70%=298.2WH, off-grid system: 100w*4.26H*70%/1.5=198.8WH. Although solar street lights and photovoltaic power generation systems are relatively common, many people still do not know how much electricity a 100w solar panel can generate in a day. Today I will answer this question for you.

Peak sunshine hours of solar modules To calculate how much electricity a 100w solar panel generates a day, you must first understand a concept: peak sunshine hours. Quoting Baidu Encyclopedia's explanation: Peak sunshine is the maximum solar irradiance that can be obtained at most locations on the earth's surface on sunny days - 1000w/㎡. The number of hours of peak sunshine in a day is called the peak sunshine hours of the day. Our solar panels can only output the maximum power when the maximum sunlight irradiance is 1000w/㎡. That is to say, a 100w solar panel can only reach its maximum power during the peak sunshine hours a day. Generates the most electricity. In a day, the local area can receive 1000w/m2 of irradiance for only 1-2 hours (different regions are different), and then collect other time periods when the maximum sunshine irradiance cannot be obtained to calculate the peak sunshine hours of the day. It should also be noted that when we bold [in sunny days], it means cloudy days, and there is no time of 1000w/㎡ in rainy days. Therefore, we can only calculate the annual average peak sunshine hours.

The amount of electricity generated in each region is different, and the sunshine conditions in each region are different, that is, the peak hours of sunshine are different, so how much electricity a 100w solar panel generates in a day is also different. Here, we take Beijing as an example. According to NASA's database, Beijing's annual average peak sunshine hours is 3.73. When we set the inclination of the solar panel to 40 degrees, we can get 4.26 peak hours of sunshine.

Beijing's peak sunshine hours This is Beijing. If you change to a city with almost less sunshine, such as Chongqing, the amount of electricity a 100w solar panel can generate a day is too much, because Chongqing's peak sunshine hours are only 2.45, only about 57% of Beijing's. How much electricity a 100w solar panel generates a day is only 57% of Beijing's. How much electricity a 100w solar panel generates a day Many people only consider the grid-connected system when calculating how much electricity a 100w solar panel generates a day. In fact, our solar photovoltaic system has two types of off-grid and grid-connected systems. The value of how much electricity a 100w solar panel generates a day in the two systems is different.

Grid-connected system
Let's take Beijing as an example to calculate how much electricity a 100w solar panel generates a day: multiply the power of 100w directly by the peak sunshine hours, and then remove 30% of the efficiency and loss, that is: 100w*4.26H*70%=298.2WH That is to say, a 100w solar panel generates 298.2WH of electricity a day, which is about 0.3 degrees.

Off-grid system
Off-grid systems are different because everyone ignores the voltage difference between the solar panel and the battery. The correct calculation method should add this part of the loss. Let's take Beijing as an example to calculate how much electricity a 100w solar panel generates a day: 100w*4.26H*70%/1.5=198.8WH, which means that a 100w solar panel generates a day. 198.8WH electricity, that is about 0.2 degrees.