Abstract
This paper analyzes the energy collected by bifacial photovoltaic panels that track the sun. A theoretical model is described that calculates the collection of light by both sides of a bifacial panel installed on a one- or two-axis tracker and placed against a variety of surroundings. The model has been verified experimentally, and then used to predict the annual energy collected at Madrid for a number of cases of practical interest. The results for two-axis tracked bifacial panels show that annual back energies of the order of 25% of the front energies can be obtained. This implies that the total (front plus back) annual energy collected by such panels can be 80% greater than that collected by a stationary monofacial panel, or some 30% greater than that collected by a stationary bifacial one.
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