The present invention is solar collection data device having a main housing with means to measure and record the sun's radiance over a period of time encased in the housing. The main housing is mounted to a platform. The platform has means to attach to a variety of surfaces, including a roof. A photovoltaic cell and a photo sensor are integrally formed in the cover of the main housing. The output of the photovoltaic cell and the photo sensor will be logged and used in determining the amount of sunlight reaching the unit.