(a)
(b)
(c)
Figure 9: Comparison of absolute errors among three different approaches for TBP-1237 module at (a) STC (Temp: 25°C; A.M.: 1.5; = 1000 W/m2), (b) Temp: 35°C; A.M.: 1.5; : 900 W/m2, and (c) Temp: 35°C; A.M.: 1.5; =1000 W/m2.