The power of solar powered auxiliary electric heaters currently on the market is 1500W. If the water tank is relatively large, you can consider using 3000W. You can see the small label on the newly purchased electric radiator. enough for a family. The electrical output of solar water heaters is typically 1,500 watts, which is only 1.5 kilowatt hours of electricity per hour. Your home's solar energy will not be permanently connected for heating. Solar water heaters are mainly based on the sun and. are not used several times a year. Do not plug it in at ordinary times.
1 square meter of crystalline silicon solar panel is equivalent to about 120-140W. If calculated as 120W, the power is about 120W . the sun at 6 hours a day is 120*6=720WH. A 10 W lamp depends on the number of hours of use per day and the number of daysrs of consecutive rain that it needs. If used 9 hours a day and 3 rainy days, the battery panel will be 30-50W.
The costs required according to regions, different installation difficulties, different roofs and the different installation methods are slightly different. The above calculations are for common installation methods.
Principle of energy production
The solar cell is a device that reacts to light and can convert light energy into electricity. There are many types of materials that can produce photovoltaic effects, such as: monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, copper selenium indium, etc. Their principles of energy production are basically the same. Today, crystalline silicon is used as an example to describe the photovoltaic power production process. Silicon cP-type crystalline is doped with phosphorus to obtain N-type silicon, forming a P-N junction.
When light irradiates the surface of the solar cell, part of the photons are absorbed by the silicon material; the energy of the photons is transferred to the silicon atoms, causing the electrons to transition and become free electrons. accumulate on both sides of the P-N junction to form a potential difference, when the external circuit is connected, under the action of this voltage, a current will flow through the external circuit to produce a certain output power. The essence of this process is: the process of converting photon energy into electrical energy.