Multidimensional model to correct PV device performance measurements taken under diffuse irradiation to reference conditions

•Model of the impact of any incident radiance condition on the output of devices.•Consideration of angle of incidence effects on the spectral responsivity.•And of spectral radiance of the sky and ground reflected irradiation on tilted surfaces.•Procedure for the correction of angular and spectral effects on PV devices.•Reduction in uncertainty for measurements under diffuse light sources.