Abstract
The characteristic declination is the declination for the day on which the daily extraterrestrial irradiation on a horizontal surface is identical to its monthly average value. It was introduced as a means to determine monthly average values of irradiation. Herein, its potential usefulness to reduce computing time when mapping solar potential in complex urban areas is explored. This simplification reduces computing demand by a factor of 30× while introducing a +5% to +8% error in the annual monthly irradiation on a typical urban neighborhood for low and midlatitudes. Errors are larger (+10% to +12%) for high latitudes. The magnitude of the errors is comparable to other relevant uncertainties in solar mapping tools, associated with solar radiation modeling, the layout and details of the buildings, or the photovoltaic (PV) energy yield models.
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