ON-grid system design Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed introduction Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed ON-grid design • Design 10 KW on grid system Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed “panels sizing” Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed Pt 10000 Number of panels = = Pmax of single panel 350 = 28 modules Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed “inverter sizing” Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed Inverter power = total power of panels=10 KW Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed connection Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed 28 modules ( one string) 𝑉𝑜𝑐 = 46.4 ∗ 28 = 1300 V > max system voltage 𝑉𝑚𝑝 = 39 ∗ 28 = 1092 V > max of MPP voltage range Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed IN 1 IN 2 28 Modules ( 2 strings X 14 ) 𝑉𝑜𝑐 = 46.4 ∗ 14 = 650 V < max system voltage 𝑉𝑚𝑝 = 39 ∗ 14 = 546 V < max of MPP voltage range Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed IN 1 IN 2 28 Modules ( 2 strings X 14 ) I IN1 = Imp = 9 A < max input current for inverter I IN2 = Imp = 9 A < max input current for inverter Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed IN 1 IN 2 Fuse for IN 1 = 15 A Fuse for IN 2 = 15 A Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed Temperature effect Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed 1) increasing temperature 60 °C 𝑉𝑜𝑐 = 650 − 60 − 25 ∗ .00321 ∗ 650 = 577 V 2) Decreasing temperature to 0 °C 𝑉𝑜𝑐 = 650 − 0 − 25 ∗ .00321 ∗ 650 = 702 V Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed “ C.B & cables ” Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed AC cables & C.B Irated = 11000 3 ∗ 380 = 16.7 A IC.B = 1.25 ∗ 16.7 = 21 A Selecting C.B rating 25 ICable = = 31. 25A .8 C.S.A (4 X 4 mm^2) Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed Required area Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed “ Energy generated per year ” Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed Eng/ Abd Elraheem Mohamed Ahmed fb.com/eng.Abdelraheem.Mohamed