The Solar Irradiance & Temperature Meter can transmit measured data to computing system via RS-485 or ZigBee(via SG90-SZ-O RS485 to ZigBee converter). The meter can analyze the long-term power generating performance based on cumulated solar power output (kWh) and temperature of solar panels. Incorporate with DC meter, the Solar Irradiance & Temperature Meter can also measure real-time solar irradiance (W/m2) and immediately calculate the immediate power generating efficiency of solar panels. Furthermore, the meter can measure maximum 2500W/m2 irradiance in the wide range of areas as well as temperature of both front and back side of solar panels.