Apogee's new modbus albedometer is a cost-effective solution for horizontal and plane of array performance monitoring of bifacial solar panels. Consisting of an Apogee Instruments SP-510 and SP-610 thermopile pyranometer, the SP-722-SS can be easily mounted to a mast or directly to a solar panel with one of the available mounting brackets.
The SP-722-SS is a thermopile albedometer with a digital signal using Modbus RTU protocol over RS-232 or RS-485. For mounting directly to a solar panel, we recommend using the AM-150 mounting bracket. To mount to a mast, use the AM-500 Net Radiometer mounting bracket.
Albedo measurements indicate the broadband shortwave reflectivity of materials and are used to monitor bifacial solar panels, understand heat retention in urban and architectural settings, and study climate and weather. Typical applications for pyranometers include shortwave radiation measurement in agricultural, ecological, and hydrological weather networks.
The SP-722-SS includes an IP68 marine-grade stainless-steel cable connector to simplify sensor removal and replacement for maintenance and recalibration.
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• Specification Sheet
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Class C (upward-looking), N/A (downward-looking)
5.5 to 24 V DC
RS-232 quiescent 37 mA, active 37 mA; RS-485 quiescent 37 mA, active 42 mA
± 5 %
0 to 2000 W mˉ²
Less than 1 %
Less than 2 % per year
Less than 1 %
Field of View
180˚ (upward-looking), 150˚(downward-looking)
385 nm to 2105 nm (upward-looking), 360 nm to 2250 nm (downward-looking)
Directional (Cosine) Response
Less than 30 W mˉ² at 80˚ solar zenith (upward-looking), Less than 10 % for angles between 0 to 60˚ (downward-looking)
Less than 5 % from -15 to 45 C
Zero Offset A
Less than 2 W mˉ²; Less than 5 W mˉ² (heated)
Zero Offset B
Less than 5 W mˉ²
Uncertainty with Daily Total
Less than 5 %
-50 to 80 C; 0 to 100 % relative humidity
390 Ω, 30.8 mA current draw and 370 mW power requirement at 12 V DC
66.5 mm height, 74.4 mm length, 33 mm width
Mass (with 5 m of cable)
5 m of four conductor, shielded, twisted-pair wire; additional cable available in multiples of 5 m; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires
4 years against defects in materials and workmanship