This contribution reports on a yearlong spectral albedo measurement campaign performed in Roskilde, Denmark. Four albedo scenarios are monitored using three sensor types. The ground surfaces include green grass, dry grass, gravel, and snow – all of which have been monitored with albedometers based on spectroradiometers, silicon-pyranometers, and thermopile pyranometers. Implications of using the various albedo data sources/assumptions in bifacial PV modeling are assessed with the spectrally weighted bifacial energy gain (BEG). We find that BEG differs by as much as 3% using the three albedo sensors and can deviate by 7% from the ground truth when an incorrect static spectral albedo assumption is used. Finally, the spectral mismatch factor (SMM) is calculated to summarize rear plane of array (POA) spectral shifts. Our measurements show midday backside POA spectral shifts as high as 25% for Silicon bifacial PV devices mounted on single axis trackers above grass.
|Title of host publication||Proceedings of 48th IEEE Photovoltaic Specialists Conference|
|Publication status||Published - 2021|
|Event||International 2021 IEEE Photovoltaic Specialists Conference - Virtual conference|
Duration: 20 Jun 2021 → 25 Jun 2021
|Conference||International 2021 IEEE Photovoltaic Specialists Conference|
|Period||20/06/2021 → 25/06/2021|