Month

Optimal tilt angle (degree)

Solar radiation on optimal tilt surface (Kwh/m² day)

Solar radiation on horizontal surface (Kwh/m² day)

Difference (Kwh/m² day)

Efficiency (%)

Jan

40

5.058

4.149

0.909

22

Feb

35

5.612

4.942

0.67

14

Mar

25

5.864

5.502

0.362

6.58

Apr

10

6.095

6.02

0.075

1.246

May

5

6.007

6.002

0.005

0.08

Jun

0

5.213

5.213

0

0

Jul

0

4.99

4.99

0

0

Aug

5

5.019

5.003

0.016

0.31

Sep

15

4.602

4.521

0.081

1.8

Oct

30

4.984

4.576

0.408

8.92

Nov

40

5.394

4.422

0.972

22

Dec

45

5.208

4.082

1.126

27.58

Average

20.833

5.337

4.952

0.385

8.710