Measurement of performance of solar panel - is determined from millivolt-meter connected to loaded photovoltaic cell

摘要

The lighting energy received by a panel of photovoltaic cells is measured to determine the performance of solar panels. The cells used have a spectral sensitivity dose to that of the solar panel and the output is measured by a millivoltmeter with a liquid crystal readout. A photovoltaic cell (4) has a silicon NP plate whose output terminals (5, 6) are connected to several load resistors (7, 8) in parallel. The output is connected to a millivoltmeter (11) input terminals (9, 10) with automatic display provided by liq. crystal readouts. The meter is powered from a battery (12) via an on offswitch (17). A threshold circuit (18) enables the battery terminal voltage to be checked when a push button (19) is pressed. When the threshold is exceeded a lamp (20) is illuminated.