Investigation on Temperature Coefficients of Three Types Photovoltaic Module Technologies under Thailand Operating Condition

This article describes a methodology to find the temperature dependence coefficients of amorphous silicon, poly crystalline and Heterojunction Intrinsic thin layer photovoltaic (PV) module. There are measured under Thailand Operating Condition. This study present three technologies of photovoltaic modules using 3.67 kWp (68 modules) of Amorphous Silicon Solar Cell (a-Si),3.60 kWp (45 modules) of Poly Crystalline Silicon Solar Cell (p-Si) and 2.88 kWp (16 modules) of Heterojunction Intrinsic Thin Layer (HIT). There were installed at Energy Park, School of Renewable Energy Technology, Naresuan University (north latitude 16o47’, east longitude 100 o16’). The 10 kW PV power station data have been recorded since year 2008 January to 2009 December. It is analyzed by linear regression technique. In addition, an average solar irradiance value in 2008 was 660 W/m2 and 640 W/m2 in the year 2009. Upon analysis, the study will show the Temperature coefficient of current, voltage, power and efficiency on array temperature obtained from liner regression. These findings of field test investigation found that the temperature coefficient value of PV array different from the factory value and the temperature coefficients in the year 2009 is higher than the year 2008. These results have an impact on systems design and sizing in similar climate regions. Thus, recommended that design and sizing of PV system in Tropical climate regions of the world take due address to these results.