The polycrystalline solar panels are composed of a number of silicon crystals. They’re made from silicon fragments which are melted and poured into sq. molds. Once these crystals are cooled, they are sliced into thin wafers and assembled together to form a polycrystalline solar panel. They’re often known as «multi-crystalline» panels.

Efficiency rankings: As much as 20.5 SEER; Power STAR qualified

Average operating decibels: Fifty eight dB

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