This paper predicts relationship between array performance and surrounding ambient including installation conditions for PV array installed on building walls. A PV system assumed for calculation is a PV array installed on the north, south, east and west walls of a building which was constructed as a NEDO field-test project. In the case of performance simulation for the actual PV system, calculated performance generally agrees with real measured data. Based on them, produced electrical energy is simulated as a function of ground albedo, array tilt angle and space between the PV array and the wall for installation. In addition, shading effect on produced electrical energy is also estimated by assuming some neighboring buildings. Effect of sub-array installation on different walls on DC power output is also estimated.

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