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PAGE <br />REV: A1 9/17/2024 <br />2500 WHITE RD. SUITE A, IRVINE CA 92614 <br />PHONE 805.540.7603 <br />FAX 949.215.7778 <br />KIM HA NGUYEN <br />1227 W RIVER LN, SANTA ANA, <br />CA, 92706 <br />PROJECT NUMBER: <br /> SC1800916342 <br />SHEET <br />DESIGNER: <br />FRENCE RETONE <br />CUSTOMER RESIDENCE: <br />TEL. (714) 675-1274 <br />APN: 00113716 <br />GILBERT CORREIA, C10, C46 <br />CA CL #750184 <br />(415) 580-6920 ex3 <br />PV-4.1 <br />ELECTRICAL CALCS <br />#ESTAMP <br />System Information <br />5.265 kW DC Photovoltaic System <br /> (13) JA Solar: JAM54S31-405/MR, ABB: <br />PVI-4.2-OUTD-S-US-A (240 V) <br />Allowable Backfeed <br />Allowable Backfeed = (Main Panel Rating) x 1.2 - (Main <br />Breaker Rating) = <br />200A x 1.2 - 200A = 40A <br />25A ≤ 40A → Interconnection meets 705.12(D)(2) <br />requirements. <br />Inverter Overcurrent Protection <br />(Inverter Max Current) x (Continuous Load) = <br />20 A x 1.25 = 25 A → 25 A Overcurrent Protection <br />Per Manufacturer <br />DC Wire Sizing <br />Max Circuit Current = (Module Isc) x (High <br />Irradiance)[690.8(A)(1)] x (Continuous <br />Load)[690.8(B)(1)]= <br />13.87A x 1.56 = 21.64A <br />Adjusted Conductor Ampacity = (High Temp)[Table <br />310.15(B)(2)(a)] x (Conduit Fill)[Table 310.15(B)(3)(a)] x <br />(Conductor Ampacity)[Table 310.15(B)(16)] = <br />0.91 x 0.8 x 40A = 29.12A <br />Terminal Rating[110.14(C)] = <br />10 AWG, 75°C Rated = 35A <br />29.12A < 35A → Adjusted conductor ampacity governs <br />conductor sizing. <br />21.64A < 29.12A → 10 AWG Ampacity OK <br />Therefore 10 AWG is sufficient. <br />AC Wire Sizing <br />Max AC Output Current = (Max Inverter Output) x <br />(Continuous Load)[210.19(A)(1)] = <br />20 A x 1.25 = 25 A <br />Adjusted Conductor Ampacity = (High Temp)[Table <br />310.15(B)(2)(a)] x (Conduit Fill)[Table 310.15(B)(3)(a)] x <br />(Conductor Ampacity)[Table 310.15(B)(16)] = <br />0.91 x 1 x 40A = 36.4A <br />Terminal Rating[110.14(C)] = <br />10 AWG, 75°C Rated = 35A <br />35A < 36.4A → Terminal rating governs conductor <br />sizing. <br />25A < 35A → 10 AWG Ampacity OK <br />Therefore 10 AWG is sufficient. <br />System Characteristics <br />Operating Voltage = (Module VMP) x (# Modules / <br />String) = <br />31.21 V x 7 = 218.47 V <br />Max Open Circuit Voltage = {[((Temp Coef VOC) x <br />(VOC)) / 100] x [Low Temp - STC Temp] + VOC} x (# <br />Modules / String) = <br />{[(-0.28 %/°C x 37.23 V) / 100] x [-2 °C - 25 °C] + <br />37.23 V} x 7 = 280.32 V <br />Operating Current = (Module IMP) * (# Strings) = <br />12.98 A x 2 = 25.96A <br />Short Circuit Current = 1.25 x (Module Isc) x (# Strings) <br />1.25 x 13.87 A x 2 = 34.68A