Data Collection Units and Accuracy Table 3 details the units and accuracy of measurements to be sent to the CAISO in real time (i.e., 4 seconds). Table 3 Device (s) Element Units Accuracy Needed Global Irradiance Plane-of-Array Irradiance Pyranometer or equivalent W/m 2 ±25W/m2 (GPOA) Global Horizontal Irradiance Pyranometer or equivalent W/m 2 ±25W/m2 (GHI) Global Diffused Pyranometer or equivalent W/m 2 ±25W/m2 (GDIFF) Diffused Irradiance Plane of Array Pyranometer or equivalent W/m 2 ±25W/m2 (DPOA Direct Irradiance Pyreheliometer or equivalent W/m 2 ±25W/m2 (DNI) Back panel temperature for Temperature probe for back panel PV type arrays at the array ± 1° ◦C temperature average height Ambient temperature at the Temperature probe & shield for ± 1° ◦C array average height ambient temp. Hecto Barometer Barometric pressure ± 60 Pa Pascals HPa Wind speed and direction at Anemometer, wind vane and wind m/s ±1 m/s the average array height mast deg ± 5° Per CAISO Transducers -- Current and Real-time Generation MWs telemetry Potential Transformers standards
Data Collection Units and Accuracy Table 3 details the units and accuracy of measurements to be sent to the CAISO in real time (i.e., 4 seconds). Table 3 Element Device (s) Needed Units Accuracy Global Irradiance Plane-of-Array Irradiance (GPOA) Pyranometer or equivalent W/m 2 ±25W/m2 Global Horizontal Irradiance (GHI) Pyranometer or equivalent W/m 2 ±25W/m2 Global Diffused (GDIFF) Pyranometer or equivalent W/m 2 ±25W/m2 Diffused Irradiance Plane of Array (DPOA Pyranometer or equivalent W/m 2 ±25W/m2 Direct Irradiance (DNI) Pyreheliometer or equivalent W/m 2 ±25W/m2 Back panel temperature for PV type arrays at the array average height Temperature probe for back panel temperature ◦C ± 1° Ambient temperature at the array average height Temperature probe & shield for ambient temp. ◦C ± 1° Barometer Barometric pressure Hecto Pascals HPa ± 60 Pa Wind speed and direction at the average array height Anemometer, wind vane and wind mast m/s deg ±1 m/s ± 5° Real-time Generation Transducers -- Current and Potential Transformers MWs Per CAISO telemetry standards
eir%20changes%20for%20market%20operations%20bpm%206%2017%2010.docx