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solar cell

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solar cell

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solar cell

  1. 1. Nur Mohammed Adnan Zadid 11010315 Mohammad Rafiul Islam 11010216
  2. 2.  A solar cell, or photovoltaic cell, is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Solar cells are the building blocks of photovoltaic modules, otherwise known as solar panels. Solar cells are described as being photovoltaic irrespectiv e of whether the source is sunlight or an artificial light.
  3. 3.  The absorption of light, generating either electron-hole pairs or exactions.  The separation of charge carriers of opposite types.  The separate extraction of those carriers to an external circuit. The operation of a photovoltaic (PV) cell requires 3 basic attributes:
  4. 4.  Absorbed Glass Mat  Amp Hour  Battery  Battery  Circuit  Circuit Breaker  Full Sun  Inverter (AC)  Maximum Power Point Tracking (MPPT)  Peak Sun Hours  Radiation  Voltage  Watt-Hour
  5. 5. Maximum power point tracking (MPPT) is a technique that grid connected inverters, solar battery chargers and similar devices use to get the maximum possible power from one or more photovoltaic modules. Photovoltaic solar cells have a complex relationship between solar irradiance (W/square meter), temperature and total resistance that produces a non-linear output efficiency which can be analyzed based on the I-V curve. Curve by MPPT
  6. 6. Solar Cell characteristics of I-V curve for temperature dependence
  7. 7. Solar Cell characteristics of I-V curve for different irradiance dependence
  8. 8.  At night, an off-grid PV system may use batteries to supply loads. Although the fully charged battery pack voltage may be close to the PV panel's maximum power point voltage, this is unlikely to be true at sunrise when the battery has been partially discharged. Charging may begin at a voltage considerably below the PV panel maximum power point voltage, and an MPPT can resolve this mismatch.
  9. 9. Controllers usually follow one of three types of strategies to optimize the power output of an array. Maximum power point trackers may implement different algorithms and switch between them based on the operating conditions of the array

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