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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 = 60A <br />•System Characteristics: <br /> •Operating Voltage = 434.33V <br /> •Max Open Circuit Voltage = 434.33V <br /> •Operating Current = 26.34A <br /> •Short Circuit Current = 35.74A <br />Inverter Overcurrent Protection: <br /> (Inverter(s) Max Combined Current) x (Continuous Load) = <br /> 96 A x 1.25 = 120.0 A → 125 A Overcurrent Protection <br />Allowable Backfeed: <br /> Allowable Backfeed = Main Panel Rating = 225 A <br /> Breakers in Interconnection Panel: 60 A Breakers + 125 A Microgrid Device Breaker = <br /> 185 A ≤ 225 A → Interconnection <br /> Meets CEC 2025 705.12(B)(3)(3) 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 <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, 35.0A >= 22.34A <br />•Tag 2: Inverter Input: 10 AWG rated 35.0A, 35.0A >= 22.34A <br />•Tag 3: Inverter Input: 10 AWG rated 35.0A, 35.0A >= 22.34A <br />•Tag 4: Inverter Output: 6 AWG rated 65.0A, 65.0A >= 60.0A <br />•Tag 5: Backup Panel Feeder: 1 AWG rated 130.0A, 130.0A >= 125.0A <br />•Tag 6: Gateway Feeder: 1 AWG rated 130.0A, 130.0A >= 125.0A <br />PAGE <br />REV: B 2/18/2026 <br />SUSAN GARCIA <br />3430 S SHEFFIELD RD, SANTA <br />ANA, CA, 92704 <br />PROJECT NUMBER: <br /> 109R-430GARC2 PR-3004702971 <br />SHEET <br />DESIGNER: <br />ASHIK <br />CUSTOMER RESIDENCE: <br />TEL. (714) 421-8080 <br />APN: 412-531-77 <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