Introduction: In the current popularity of solar energy, I think everyone has a question, that is, the specific working state of solar energy products such as solar garden lights, can you use solar garden lights in the absence of the sun? Understand the working status of the battery pack in the home solar photovoltaic power system, let you know more about your solar products and answer your doubts.

    In a photovoltaic power generation system, a solar cell array converts solar radiant energy into direct current electrical energy, and converts its electrical energy into chemical energy through a storage battery. We usually refer to a storage battery as a storage device for a photovoltaic power generation system.

   For the home solar photovoltaic power system, it is required to provide stable power to the load at any time. However, due to the intermittent and random nature of the ground sunlight, it is difficult to realize the power supply task by the solar battery, and it must be through the energy storage device. The energy from the solar cells is stored and adjusted.

   Under the current technical conditions, the function of storing electrical energy in the photovoltaic system is performed by the battery pack. Only in some systems with very small power or short-time operation, some people also use supercapacitors and other components to store electric energy.

   The power output by the solar cell is proportional to the solar radiation radiated on its surface. When the sunshine is insufficient, there is no light, or the system needs to be repaired, the energy output by the solar cell will be reduced or even no power output. When the photovoltaic system is working normally. According to the change of the normal charge and discharge state of the battery, it is divided into various situations: the first case is that the load is turned off, and the solar cell array is normally generated. At this time, all the electric energy is charged to the battery pack, and the electric energy is converted into chemical energy to be stored. Until the controller is fully protected and the controller protection is disconnected; the second case is that while the solar cell is generating electricity, the load also needs to work.

   At this time, the solar cell will supply power directly to the load (or through the inverter circuit), and the excess power will also charge the battery pack at the same time. If the current required by the load at this time is greater than the current generated by the solar cell array, it is supplemented by the battery pack; more work may be that the solar battery no longer generates power, and all the power required by the load is provided by the battery pack. The energy stored in the battery in the form of chemical energy is converted into electrical energy for use by the load. Therefore, the battery can store electric energy, and can also play a role in regulating the power and stabilizing the output of the system.

   For domestic photovoltaic systems with lighting fixtures and household appliances as the main load, in general, the battery is charged by the solar battery during the day, no load or occasionally light load, and the battery is powered by the battery at night, and the battery is in a discharged state. For a properly designed system, if the battery is in a fully charged state, the amount of electricity discharged at night will generally only account for a small portion of the battery pack, which is a shallow discharge state.

   If the weather is fine the next day, the energy consumed by the battery pack can be replenished by charging. However, in the event of continuous rainy weather, the solar array will not be able to charge the battery pack for a long period of time, and during this time, the energy stored in the battery pack will still be used to independently supply power to the load. This will cause the discharge of the battery pack to be deepened, and if it is unreasonable in design, manufacture or use, the overdischarge of the battery is most likely to occur in this case.

   When the continuous rainy weather is over, even if the weather is sunny and the radiance is strong, it is impossible to allocate more energy because the solar cell array cannot be configured with a larger margin. In the following days, in addition to meeting the normal daily power supply requirements, the battery pack will be gradually supplemented by the daily charge and discharge margin, which means that it may be able to return to full state in a few days. This is a deep discharge that lasts for a long time. The process of slow charging may occur many times in the year, and the number of occurrences in areas with poor solar resources will be more.

    Solar products are always charging, discharging, and storing electricity. Only the energy converted during the day can be stored immediately to meet the night and the lack of sunlight. Therefore, in addition to solar panels, solar products now come with a battery, and all solar garden lights on the market also come with batteries. Now you know why solar products can still have electricity in the days when there is no sun. Nuusolar is a company specializing in the production of solar lighting products. Factory direct sales have quality assurance. Please contact online customer service if you need it.