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PAGE <br />REV: D 1/13/2026 <br />JULIE VO <br />3455 S CRAWFORD GLEN, <br />SANTA ANA, CA, 92704 <br />PROJECT NUMBER: <br /> 109R-455VO PR-3004660114 <br />SHEET <br />DESIGNER: <br />SREERAJ P R <br />CUSTOMER RESIDENCE: <br />TEL. (309) 660-0844 <br />APN: 412-531-51 <br />(415) 580-6920 ex3 <br />PV-4.2 <br />#ESTAMP#SSTAMP <br />2500 WHITE RD. SUITE A, IRVINE CA 92614 <br />PHONE 805.540.7603 <br />FAX 949.215.7778 <br />CA CL #750184 <br />GILBERT CORREIA, C10, C46 <br />ELECTRICAL CALCS <br />Inverter Calculations <br />Each Inverter has the following values which are calculated following these formulas: <br />Inverter X: <br />•Max DC Circuit Current = (Module Isc) x (High Irradiance)(690.8(A)(1)(a)) <br />•Max AC Output Current = (Max Inverter Output) <br />•OCPD Needed = (Max AC Output Current) x 1.25 <br />•System Characteristics: <br /> •Operating Voltage = (Module Vmp) x (# Modules / String) <br /> •Max Open Circuit Voltage = [((Temp Coef Voc) x (Voc)) / 100] x (Low Temp - STC Temp) + Voc <br />* (# Modules / String) <br /> •Operating Current = (Module Imp) x (# Strings) <br /> •Short Circuit Current = 1.25 x (Module Isc) x (# Strings) <br />Inverter Powerwall 3 1707000-xx-y <br />•Max DC Circuit Current = 17.46A <br />•Max AC Output Current = 48A <br />•OCPD Needed = 60A <br />•System Characteristics: <br /> •Operating Voltage = 405.73V <br /> •Max Open Circuit Voltage = 535.10V <br /> •Operating Current = 25.96A <br /> •Short Circuit Current = 35.55A <br />Inverter Powerwall 3 1707000-xx-y <br />•Max DC Circuit Current = 17.46A <br />•Max AC Output Current = 48A <br />•OCPD Needed = 60A <br />•System Characteristics: <br /> •Operating Voltage = 312.11V <br /> •Max Open Circuit Voltage = 411.62V <br /> •Operating Current = 25.96A <br /> •Short Circuit Current = 35.55A <br />Combinded Inverter Output: <br /> •Max AC Output Current = 96 <br /> •OCPD Needed = 120 <br />Inverter Overcurrent Protection: <br /> (Inverter(s) Max Combined Current) x (Continuous Load) = <br /> 96 A x 1.25 = 120.0 A → 150 A Overcurrent Protection <br />Allowable Backfeed: <br /> Max Allowed Total Generation Backfeed OCPD = <br /> Main Breaker Rating = 225 A <br /> 150 A ≤ 225 A → Interconnection <br /> Meets CEC 2022 705.13 Requirements <br />Wire Calculations <br />Wire ampacity calculated from CEC 310.16/310.17 as appropriate with ambient temperature <br />calculations from CEC 310.15(B)(1) and raceway fill adjustments from CEC 310.15(C)(1). Conduit <br />on the roof shall be installed no less than 1" above the roof deck. PV Circuit conductor ampacity is <br />constrained using the 75°C column with the continuous duty uprating or the 90°C column with the <br />relevant ambient temperature and raceway fill adjustments without the continuous duty uprating <br />per 690.8(B), whichever is the lower value will govern conductor sizing. Non-PV Circuit <br />Conductors use the ampacity in the 75°C column or the 90°C column with the relevant ambient <br />temperature and raceway fill adjustments, whichever is less (110.14(C) & 310.15(A)(2)). The rating <br />of the conductor after adjustments shall be greater than, or equal to, the continuous duty uprated <br />current. <br />Calc Ex: Wire Ampacity x Ambient Temp. Corr. Factor x Conduit Fill Adj. Factor >= Output Current <br />•Tag 1: Inverter Input: 10 AWG rated 35.00A, 35.00A >= 21.82A <br />•Tag 2: Inverter Input: 10 AWG rated 35.00A, 29.12A >= 21.82A <br />•Tag 3: Inverter Output: 6 AWG rated 65.00A, 65.00A >= 60.00A <br />•Tag 4: Gateway output: 1/0 AWG rated 150.00A, 150.00A >= 150.00A