Solar light is composed of solar cell components, some LED lamps, a control box (with charger, controller, and storage battery in the control box) and a light pole. The luminous efficiency of the solar panel reaches 127Wp/m2, and the efficiency is high, which is very beneficial to the wind-resistant design of the system; the lamp holder part is integrated with 1W white LED and 1W yellow LED on the printed circuit board and arranged in a dot matrix with a certain interval as a plane. light source. The control box is made of stainless steel, which is beautiful and durable; the control box is equipped with a maintenance-free lead-acid battery and a special charge controller for solar street lights successfully developed using patented slow pulse fast charge and discharge technology. The system uses valve-controlled sealed lead-acid batteries, which are also called "maintenance-free batteries" because they are rarely maintained, which helps reduce system maintenance costs; the charge and discharge controller is designed with full functions (with light control, Time control, overcharge protection, overdischarge protection and reverse connection protection, etc.) and cost control to achieve a high cost performance. The working principle of the solar lamp is simple. The solar cell is made by using the principle of photovoltaic effect. During the day, the solar cell panel receives solar radiation energy and converts it into electrical output. It is stored in the battery through the charge and discharge controller. At night, when the illumination is gradually reduced to about 101ux, The open circuit voltage of the solar panel is about 4.5V, and the charge and discharge controller will act after detecting this voltage value, and the battery will discharge the lamp cap. After the battery is discharged for 8.5 hours, the charging and discharging control action is performed, and the battery discharge ends. The main function of the charge and discharge controller is to protect the battery. Solar energy is the energy produced by the continuous nuclear fusion reaction of sunspots inside or on the sun. The average solar radiation intensity in the earth's orbit is 1367w/ã¡. The circumference of the earth's equator is 40,000 km, so it can be calculated that the energy obtained by the earth can reach 173,000 TW. The standard peak intensity at sea level is 1kw/ã¡, and the average annual radiation intensity at a certain point on the earth's surface for 24 hours is 0.20kw/ã¡, which is equivalent to 102,000 TW of energy. Humans rely on this energy to survive, including all other forms of energy. Renewable energy (except geothermal energy resources), although the total amount of solar energy resources is equivalent to more than 10,000 times the energy used by human beings, the energy density of solar energy is low, and it varies from place to place and changes with time. This is the development and utilization of solar energy. The main problem faced. These characteristics of solar energy will limit its role in the entire integrated energy system. Although the energy radiated by the sun into the earth's atmosphere is only one part of 2.2 billion of its total radiant energy, it is already as high as 173,000 TW, which means that the energy that the sun irradiates on the earth every second is equivalent to 5 million tons of coal. The earth's wind energy, water energy, ocean temperature difference energy, wave energy and biomass energy, and part of the tidal energy all come from the sun; even the fossil fuels on the earth (such as coal, oil, natural gas, etc.) are fundamentally ancient Since the stored solar energy, the broad sense of solar energy includes a very large range, while the narrow sense of solar energy is limited to the direct conversion of solar radiant energy, photo-thermal, photoelectric, and photochemical. Solar energy (Solar Energy) generally refers to the radiant energy of sunlight, which is generally used to generate electricity in modern times. Since the formation of the earth, organisms have mainly survived by the heat and light provided by the sun, and since ancient times, humans have also known to use the sun to dry objects and use them as a method of preserving food, such as salt production and salted fish. However, with the reduction of fossil fuels, solar energy is deliberately developed further. There are two ways to use solar energy: passive utilization (photothermal conversion) and photoelectric conversion. Solar power is an emerging renewable energy source. In a broad sense, solar energy is the source of many energy on the earth, such as wind energy, chemical energy, potential energy of water, and so on.
How can the formula for gravitational potential energy be negative if energy is always positive (if the formula is -G*M1*M2/r, will I end up with -x joules, if so how can that be)?
F = GmM/ r^2U = integral F dr= (GmM) r^-2 dr = - GmM/ rAlso F = -gradeU = -grade( GmM r^-1)= G mM/ r^2
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