Solar Power for Lighting. Design Note 27


Solar panelYou can use a Solar panel to power electrical appliances directly during day time if the Sunlight is very good, direct and continuous. So you have to install a Solar panel in a well lit area over the roof top in the East- West direction with a slight angle facing the Solar panel to the sky. So when the solar panel gets sunlight, it generates voltage and current which flows through the cables connected to it. You can have two options. The current can be stored in a battery to power the appliances at night through an Inverter or you can directly use the solar power using an Inverter without battery. Solar power is DC voltage and the Inverter converts this DC into AC to power the AC appliances. So let us see the requirements.
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Fact File 1- How does Solar cell works?


Solar cell is a semiconductor device used for harvesting Solar energy to charge battery. It generates current through the excitation of its semiconductor material by the Photon energy of the sunlight.

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Design Your Circuit. Part X11 – Solar Night Lamp


Solar cell is the semiconductor device that converts light energy into electrical energy through the Photovoltaic effect. Solar cells are intended to capture energy from the sunlight while the term Photovoltaic cell is used to denote the devices that receive light from unspecified sources. Solar cells are connected in series to get Additive voltage. The serially connected solar cells are encapsulated as Modules which are then interconnected in series or parallel to get a large Array. Series connection increases the voltage while parallel connection increases the current. Each panel has specified voltage, current and power output which depends on the number of solar cells connected in series and parallel. Let us see some solar facts.

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Picnic lamp


This simple White LED lamp switches on when its surroundings turn dark. It is an ideal portable lamp in picnic sites. It uses solar power for charging the battery and an LDR for automatic switching.

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Trick to Exploit Calculator Solar panel


Don’t throw away your old calculator. Its Solar panel can be used to make a Broken beam alarm or Automatic LED lamp. Let us see two circuits exploiting the photovoltaic property of the tiny calculator solar panel .

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Solar Night Lamp


Here is a simple Solar Night lamp that turns on automatically at sunset and stays on till morning. It uses 1 Watt High Bright White LEDs to illuminate a confined area.

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Optoelectronic Devices


Optoelectronic devices are used to activate or deactivate an electronic circuit based on the intensity of light. Besides this general purpose, optoelectronics devices are used in telecommunication, surveillance systems, capturing solar energy etc. Solid state optoelectronic components are used as sensors for detecting visible light, Infrared rays Laser, Ultraviolet rays etc. The note given here explains the different types of optoelectronics devices and their applications.

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