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Figure 6 Typical I-V Characteristics of Solar System. From typical I-V characteristics at STC (Figure 6) it is observed that Efficiency reduction of maximum power from an irradiance of 1000 W/m’ to 200W/m*’ at 25°C is typically 3.0%. The standard deviation for the reduction of efficiency is 2.6%. Typical I-V Characteristics of a Solar cell is also shown in Figure 7. Figure 8. Relative Efficiency at different Temperature.