A METHOD FOR THE MEASUREMENT OF THE PHOTOVOLTAIC
Abstract
For the measurement of the current-voltage characteristic of a photovoltaic (PV) cell or module, an experimental “self testing” method is proposed which uses as “load” one or more PV cells (modules), appropriately connected to the test cell and subjected to a variable irradiance. Depending on the irradiance values towards the test cell (module), the “load” cell will behave as a true load, a reverse voltage generator or a reverse current generator. Therefore, it is possible to obtain, by an automatic data acquisition system, the points of the test cell I = I(U) characteristic in quadrants I, II and IV. On this basis, a simple three quadrant I = I(U) curve tracer, based on a digital or analog storage oscilloscope, is produced. Laboratory and field tests on cells and modules have shown the easy feasibility of implementating this method.
Written by John on November 7th, 2008 with
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