The albedo of the ground surface is an important factor in the cost-effectiveness of a bifacial photovoltaic (PV) system. To improve the availability of reliable albedo data, datasets of ground albedo and associated meteorological data were developed by using existing measurement network data and data measured by the PV industry. The measured datasets include time-series data as well as summary information of tabular monthly and yearly data and plots of monthly and hourly albedo values. Satellite-derived values of albedo are available from the National Solar Radiation Data Base (NSRDB). The NSRDB albedos were compared to the measured albedos for Surface Radiation budget (SURFRAD) network locations for the period 2001–2017, and the mean bias difference results were from −0.044 to +0.056. These differences are greater than the albedo measurement uncertainty of ±0.02; consequently, the NSRDB albedos should be used with caution for estimating the performance of bifacial PV systems. Differences between SURFRAD and NSRDB albedos are attributed to the NSRDB method for determining albedo and to the ground surfaces within the NSRDB 4 km spatial resolution pixel consisting of a mixture of surface types rather than just the single surface types viewed by the albedometers at the SURFRAD stations.

地表的反照率是双面光伏（PV）系统成本效益的重要因素。为了提高可靠反照率数据的可用性，通过使用现有的测量网络数据和光伏行业测得的数据，开发了地面反照率和相关气象数据的数据集。测得的数据集包括时间序列数据以及表格月度和年度数据的摘要信息以及月度和小时反照率值的图。可从国家太阳辐射数据库（NSRDB）获得卫星反照率值。将NSRDB的反照率与实测的2001-2017年表面辐射预算（SURFRAD）网络位置的反照率进行比较，平均偏差差结果为-0.044至+0.056。这些差异大于反照率测量不确定度的±0.02；因此，在评估双面光伏系统的性能时应谨慎使用NSRDB反照率。SURFRAD和NSRDB反照率之间的差异归因于NSRDB确定反照率的方法以及NSRDB 4 km空间分辨率像素中的地表，该像素由混合的表面类型组成，而不仅仅是SURFRAD站的反照率仪观察到的单一表面类型。