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Polycrystalline (sometimes also called multicrystalline) solar panels are the most common because they are often the least expensive. They are the middle choice in the marketplace ... almost as good as single cell monocrystalline silicon panels. Generally speaking, polycrystalline panels have an efficiency that is about 70% to 80% of a comparable monocrystalline solar panel, but the production cost is lower than single-crystalline solar modules.
Polycrystalline cells can be recognized by a visible grain, a metal flake effect. The solar cells are generally square in shape, and may have a surface that looks somewhat like a mosaic. Thats because of all the different crystals that make up the PV module.
Benefits of Polycrystalline Solar Panels
1. Lower per Panel Costs
Polycrystalline cells are much simpler to produce, and cost far less to manufacture. This makes them much less expensive for buyers, especially those with small to medium sized roofs.
2. Durability and Longevity
The durability and longevity are comparable to their monocrystalline cousins C namely at least 25 years. Polycrystalline solar panel modules could put solar power into the hands of people who could not afford the monocrystalline cells.
3. Lower Electric Bills
Any solar system can and probably will result in a lower electricity bill. Even though the amount of electricity produced from a polycrystalline solar panel is less than from a monocrystalline panel C so are the costs so you have to fine tune your analysis to see which one has the better payback over the time frame of your analysis (e.g., 20 years in Europe C which is usually the time period of the Feed in Tariffs).

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  Amorphous Solar Cell 4V 9.1uA
  Small Solar Panel 5V 1W
  Solar Module 1V 450mA
  Solar Photovoltaic Module 5V 0.5W
  Mini Solar Cell 4.5V 80mA
  Monocrystalline Solar Panel 18V 5.5W
  Monocrystalline Solar Panel 12V 24W
  Polycrystalline Solar Module 12V 12W
  Polycrystalline Solar Module 12V 29W