Polycrystalline panels are the most commonly used type of solar technology for small scale installations.
Polycrystalline technology is typically less expensive than the monocrystalline, but it is considered less efficient.
Ameren's Polycrystalline Equipment
With a total capacity of 32.76 kW DC, 156 Suntech modules
, rated at 210 watts/module and covering an area of about 3,900 sq. ft., are installed and produce energy on Ameren's west building.