  The effect of temperature and relative humidity on photovoltaics close to
river in calabar was studied. A KT-908 precision digital hygrometer and
thermometer, and a M890C+ digital multimeter were used in the process. Results
obtained shows that the effect of relative humidity on current, power and
efficiency are the same. The results also show that voltage remains fairly
stable between 65% to 75% relative humidity. While efficiency increases with
temperature up to the maximum operating temperature of the photovoltaic module
before starting to decrease. Peak in efficiency was observed at a relative
humidity value of 65% and module temperature of about 470C at noon.
