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PAGE <br />REV: F 6/2/2025 <br />2500 WHITE RD. SUITE A, IRVINE CA 92614 <br />PHONE 805.540.7603 <br />FAX 949.215.7778 <br />EFREN LUMBRERAS <br />2100 E WELLINGTON AVE, <br />SANTA ANA, CA, 92701 <br />PROJECT NUMBER: <br /> 109R-100LUMB <br />SHEET <br />DESIGNER: <br />KEVIN SIN <br />CUSTOMER RESIDENCE: <br />TEL. (949) 763-0025 <br />APN: 400-153-29 <br />GILBERT CORREIA, C10, C46 <br />CA CL #750184 <br />(415) 580-6920 ex3 <br />PV-4.1 <br />ELECTRICAL CALCS <br />Template_version_v5_2024.02.28 <br />ELECTRICAL CALCS <br />SYSTEM INFORMATION <br />4 KW DC PHOTOVOLTAIC SYSTEM <br /> (10) LONGI GREEN ENERGY TECHNOLOGY CO LTD: LR5-54HABB-400M, TESLA: POWERWALL 3 1707000-XX-Y <br />ALLOWABLE BACKFEED ALLOWABLE BACKFEED = (MAIN PANEL RATING) X 1.2 - (MAIN BREAKER RATING) = <br />225A X 1.2 - 200A = 70A <br /> 60A ≤ 70A → INTERCONNECTION MEETS 705.12(B)(3)(2) REQUIREMENTS. <br />DC WIRE SIZING <br />MAX CIRCUIT CURRENT = (MODULE ISC) X (HIGH IRRADIANCE)[690.8(A)(1)] X (CONTINUOUS LOAD)[690.8(B)(1)]= <br /> 14.88A X 1.25 X 1.25= 23.25A <br />ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)] X (CONDUIT FILL)[TABLE 310.15(C)(1)] X (CONDUCTOR <br />AMPACITY)[TABLE 310.16] = <br /> 0.91 X 1 X 40A = 36.4A <br />TERMINAL RATING[110.14(C)] = <br /> 10 AWG, RATED = 35A <br />35A < 36.4A → TERMINAL RATING GOVERNS CONDUCTOR SIZING. <br /> 23.25A < 35A → 10 AWG AMPACITY OK <br />THEREFORE 10 AWG IS SUFFICIENT. <br />AC WIRE SIZING <br />MAX AC OUTPUT CURRENT = (MAX INVERTER OUTPUT) X (CONTINUOUS LOAD)[210.19(A)(1)] = <br />48 A X 1.25 = 60 A <br />ADJUSTED CONDUCTOR AMPACITY = (HIGH TEMP)[TABLE 310.15(B)(1)] X (CONDUIT FILL)[TABLE 310.15(C)(1)] X (CONDUCTOR <br />AMPACITY)[TABLE 310.16] = <br />0.91 X 1 X 75A = 68.25A <br />TERMINAL RATING[110.14(C)] = <br />6 AWG, RATED = 65A <br />65A < 68.25A → ADJUSTED CONDUCTOR AMPACITY GOVERNS CONDUCTOR SIZING. <br />60A < 65A → 6 AWG AMPACITY OK <br />THEREFORE 6 AWG IS SUFFICIENT. <br />SYSTEM CHARACTERISTICS <br />MAX OPEN CIRCUIT VOLTAGE = {[((TEMP COEF VOC) X (VOC)) / 100] X [LOW TEMP - STC TEMP] + VOC} X (# MODULES / STRING) <br />= <br />{[(-0.26 %/°C X 37.05 V) / 100] X [-2 °C - 25 °C] + 37.05 V} X 10 = 397 V <br />SHORT CIRCUIT CURRENT = 1.25 X (MODULE ISC) X (# STRINGS) <br />1.25 X 14.88 A X 1 = 18.6A <br />F