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PAGE REV: C 4/8/2025 2500 WHITE RD. SUITE A, IRVINE CA 92614 PHONE 805.540.7603 FAX 949.215.7778 ANGELA SAMPSON 3340 S CRAWFORD GLEN, SANTA ANA, CA, 92704 PROJECT NUMBER: 109R-340SAMP SHEET DESIGNER: VISHNUMAYA KP CUSTOMER RESIDENCE: TEL. (714) 642-8754 APN: 412-521-03 GILBERT CORREIA, C10, C46 CA CL #750184 (415) 580-6920 ex3 PV-4.2 ELECTRICAL CALCS SYSTEM INFORMATION 9.6 KW DC PHOTOVOLTAIC SYSTEM (8) LONGI GREEN ENERGY TECHNOLOGY CO LTD: LR5-54HABB-400M, TESLA: POWERWALL 3 1707000-XX-Y (16) LONGI GREEN ENERGY TECHNOLOGY CO LTD: LR5-54HABB-400M, TESLA: POWERWALL 3 1707000-XX-Y SYSTEM OCPD SIZE (COMBINED MAX CURRENT) X (CONTINUOUS LOAD) = 144 A X 1.25 =180 A → 200 A OVERCURRENT PROTECTION GATEWAY SYSTEM AC WIRE SIZING MAX AC OUTPUT CURRENT = 200 A ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)(1)] X (CONDUIT FILL) [TABLE 310.15(C)(1)] X (CONDUCTOR AMPACITY) [TABLE 310.16] = 0.91 X 1 X 225A = 204.75A TERMINAL RATING[110.14(C)] = 3/0 AWG, 75°C RATED = 200A 200A < 204.75A TERMINAL RATING GOVERNS CONDUCTOR SIZING 200A ≤ 200A 3/0 AWG AMPACITY OK THEREFORE 3/0 AWG IS SUFFICIENT. ALLOWABLE BACKFEED ALLOWABLE BACKFEED = MAIN PANEL RATING = 225A LOADS IN MAIN PANEL:0A LOADS + 200A GATEWAY BREAKER = 200A ≤ 225A INTERCONNECTION MEETS CEC 705.12(B)(3)(3) REQUIREMENTS. INVERTER INFORMATION 3200 W DC PHOTOVOLTAIC SYSTEM (8) LONGI GREEN ENERGY TECHNOLOGY CO LTD: LR5-54HABB-400M, TESLA: POWERWALL 3 1707000-XX-Y INVERTER OVERCURRENT PROTECTION (INVERTER MAX CURRENT) X (CONTINUOUS LOAD) = 48 A X 1.25 = 60 A → 60 A OVERCURRENT PROTECTION PER MANUFACTURER DC WIRE SIZING MAX CIRCUIT CURRENT = (MODULE ISC) X (HIGH IRRADIANCE)[690.8(A)(1)] X (CONTINUOUS LOAD)[690.8(B)(1)]= 14.88A X 1.25 X 1.25 = 23.25A ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)] X (CONDUIT FILL) [TABLE 310.15(C)(1)] X (CONDUCTOR AMPACITY)[TABLE 310.16] = 0.91 X 1 X 40A = 36.4A TERMINAL RATING[110.14(C)] = 10 AWG, 75°C RATED = 35A 35A < 36.4A → TERMINAL RATING GOVERNS CONDUCTOR SIZING. 23.25A < 35A → 10 AWG AMPACITY OK THEREFORE 10 AWG IS SUFFICIENT. AC WIRE SIZING MAX AC OUTPUT CURRENT = (MAX INVERTER OUTPUT) X (CONTINUOUS LOAD) [210.19(A)(1)] = 48 A X 1.25 = 60 A ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)] X (CONDUIT FILL) [TABLE 310.15(C)(1)] X (CONDUCTOR AMPACITY)[TABLE 310.16] = 0.91 X 1 X 75A = 68.25A TERMINAL RATING[110.14(C)] = 6 AWG, 75°C RATED = 65A 65A < 68.25A → TERMINAL RATING GOVERNS CONDUCTOR SIZING. 60A < 65A → 6 AWG AMPACITY OK THEREFORE 6 AWG IS SUFFICIENT. SYSTEM CHARACTERISTICS MAX OPEN CIRCUIT VOLTAGE = {[((TEMP COEF VOC) X (VOC)) / 100] X [LOW TEMP - STC TEMP] + VOC} X (# MODULES / STRING) = {[(-0.26 %/°C X 37.05 V) / 100] X [-2 °C - 25 °C] + 37.05 V} X 9 = 356.85 V SHORT CIRCUIT CURRENT = 1.25 X (MODULE ISC) X (# STRINGS) 1.25 X 14.88 A X 1 = 18.6A INVERTER INFORMATION 6400 W DC PHOTOVOLTAIC SYSTEM (16) LONGI GREEN ENERGY TECHNOLOGY CO LTD: LR5-54HABB-400M, TESLA: POWERWALL 3 1707000-XX-Y INVERTER OVERCURRENT PROTECTION (INVERTER MAX CURRENT) X (CONTINUOUS LOAD) = 48 A X 1.25 = 60 A → 60 A OVERCURRENT PROTECTION PER MANUFACTURER DC WIRE SIZING MAX CIRCUIT CURRENT = (MODULE ISC) X (HIGH IRRADIANCE)[690.8(A)(1)] X (CONTINUOUS LOAD)[690.8(B)(1)]= 14.88A X 1.25 X 1.25 = 23.25A ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)] X (CONDUIT FILL) [TABLE 310.15(C)(1)] X (CONDUCTOR AMPACITY)[TABLE 310.16] = 0.91 X 1 X 40A = 36.4A TERMINAL RATING[110.14(C)] = 10 AWG, 75°C RATED = 35A 35A < 36.4A → TERMINAL RATING GOVERNS CONDUCTOR SIZING. 23.25A < 35A → 10 AWG AMPACITY OK THEREFORE 10 AWG IS SUFFICIENT. AC WIRE SIZING MAX AC OUTPUT CURRENT = (MAX INVERTER OUTPUT) X (CONTINUOUS LOAD) [210.19(A)(1)] =48 A X 1.25 = 60 A ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)] X (CONDUIT FILL) [TABLE 310.15(C)(1)] X (CONDUCTOR AMPACITY)[TABLE 310.16] = 0.91 X 1 X 75A = 68.25A TERMINAL RATING[110.14(C)] = 6 AWG, 75°C RATED = 65A 65A < 68.25A → TERMINAL RATING GOVERNS CONDUCTOR SIZING. 60A < 65A → 6 AWG AMPACITY OK THEREFORE 6 AWG IS SUFFICIENT. SYSTEM CHARACTERISTICS MAX OPEN CIRCUIT VOLTAGE = {[((TEMP COEF VOC) X (VOC)) / 100] X [LOW TEMP - STC TEMP] + VOC} X (# MODULES / STRING) = {[(-0.26 %/°C X 37.05 V) / 100] X [-2 °C - 25 °C] + 37.05 V} X 8 = 317.20 V SHORT CIRCUIT CURRENT = 1.25 X (MODULE ISC) X (# STRINGS) 1.25 X 14.88 A X 2 = 37.2A C 3340 S Crawford Glen4/28/2025