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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) + <br />Voc} * (# 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 = 17.87A <br />•Max AC Output Current = 48A <br />•OCPD Needed = 50A <br />•System Characteristics: <br /> •Operating Voltage = 267.28V <br /> •Max Open Circuit Voltage = 331.97V <br /> •Operating Current = 26.34A <br /> •Short Circuit Current = 35.74A <br />Inverter Powerwall 3 1707000-xx-y <br />•Max DC Circuit Current = 17.87A <br />•Max AC Output Current = 48A <br />•OCPD Needed = 50A <br />•System Characteristics: <br /> •Operating Voltage = 300.69V <br /> •Max Open Circuit Voltage = 373.46V <br /> •Operating Current = 13.17A <br /> •Short Circuit Current = 17.87A <br />Combinded Inverter Output: <br /> •Max AC Output Current = 96 <br /> •OCPD Needed = 100 <br />Allowable Backfeed: <br /> Max Allowed Total Generation Backfeed OCPD = <br /> Main Breaker Rating = 200 A <br /> 125 A ≤ 200 A → Interconnection <br /> Meets CEC 2022 705.13 Requirements <br />Wire Calculations <br />Wire ampacity calculated from 310.15(B)(16) & (17) as appropriate with ambient temperature <br />calculations from 310.15(B)(3)(c) and raceway fill adjustments from 310.15(B)(3)(a). Conduit on <br />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 <br />rating of the conductor after adjustments shall be greater than, or equal to, the continuous duty <br />uprated 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 35.0A, 30.8A >= 22.34A <br />•Tag 2: Inverter Output: 6 AWG rated 75.0A, 66.0A >= 60.0A <br />•Tag 3: Inverter Output: 6 AWG rated 75.0A, 66.0A >= 60.0A <br />•Tag 4: Load Center Feeder: 1 AWG rated 145.0A, 145.0A >= 60.0A <br />PAGE <br />REV: A 9/12/2025 <br />MARY MACALA <br />1301 MAR LES W, SANTA ANA, <br />CA, 92706 <br />PROJECT NUMBER: <br /> 109R-301MACA PR-3004210689 <br />SHEET <br />DESIGNER: <br />JOANNA MARIE PALMA <br />CUSTOMER RESIDENCE: <br />TEL. (714) 309-7546 <br />APN: 198-071-46 <br />(415) 580-6920 ex3 <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 />ELEC CALCS <br />PV-4.1