DIY Solar Power

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Solar PV Systems What Makes A Solar PV
System

• http//buildyourownsolarpanelshelp.com
• 2011

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PV Components

• The module is the smallest component of the PV
  system. This is a connected set of solar cells
  which have been sealed to protect themselves from
  the environment.
• A group of modules attached together is known as
  a panel.
• Groups of panels are then put together to make a
  sub-array, which is the part of an array assembly
  that can be considered a unit and delivers some
  fraction of the total system output.
• An array, is an assembly of subarray, panels or
  modules (or a combination of these) which
  includes a support structure but no non-pv
  components.
• The array-field is a collection of all the arrays
  in the system.

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Modules

• The module is a collection of solar PV cells
  connected in series and sealed for protection
  against the environment.
• Generally sold in any size (5-150W).
• Typically the cells sit in an encapsulant (EVA)
  sandwiched between the front cover and the back
  protection.
• Moisture proof backing is generally used. There
  is also a terminal box where the cables to
  connect the module are found.

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Array Field

• Modules are connected into series strings to
  provide the correct voltage.
• Modules in a string are matched as the module
  with the lowest current determines the string
  current.
• By pass diodes are also used across the modules
  to limit any damage due to mismatch (hotspots).
• The strings are then matched in terms of total
  voltage and connected in parallel to provide the
  required system current.
• A blocking diode is connected in series with each
  string to prevent battery discharge at night.

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