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The HT Instruments HT305 Irradiance Sensor is a reference cell for irradiance measurements. The HT305 measures irradiance only when connected to the remote unit SOLAR03 through an in-built monocrystalline cell, and can be used with two different kinds of modules, built according two different technologies:
MONOFACIAL modules measurement of irradiance only on the module’s front (F)
BIFACIAL modules measurement of irradiance both on the module’s front (F) and on the module’s back (obtained by reflection from the surrounding environment) by dividing the high back part (BH = Back High) and the low back part (BL = Back Low). In this case, it is necessary to use three HT Instruments HT305 cells.