Laserfiche WebLink
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 = 17.87A <br />•Max AC Output Current = 48A <br />•OCPD Needed = 60A <br />•System Characteristics: <br /> •Operating Voltage = 434.33V <br /> •Max Open Circuit Voltage = 539.44V <br /> •Operating Current = 39.51A <br /> •Short Circuit Current = 53.61A <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 = 400.92V <br /> •Max Open Circuit Voltage = 497.95V <br /> •Operating Current = 13.17A <br /> •Short Circuit Current = 17.87A <br />Inverter Powerwall 3 1707000-xx-y <br />•Max DC Circuit Current = 0A <br />•Max AC Output Current = 48A <br />•OCPD Needed = 60A <br />•System Characteristics: <br /> •Operating Voltage = 0.0V <br /> •Max Open Circuit Voltage = 0.0V <br /> •Operating Current = 0.0A <br /> •Short Circuit Current = 0.0A <br />Combinded Inverter Output: <br /> •Max AC Output Current = 144 <br /> •OCPD Needed = 180 <br />Allowable Backfeed: <br /> Max Allowed Total Generation Backfeed OCPD = <br /> Main Breaker Rating = 200 A <br /> (3) 60A ≤ 200 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 <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 1A: Inverter Input: 10 AWG rated 35.0A, 29.12A >= 22.34A <br />•Tag 2A: Inverter Input: 10 AWG rated 35.0A, 29.12A >= 22.34A <br />•Tag 3: Inverter Input: 6 AWG rated 65.0A, 65.0A >= 22.34A <br />•Tag 4: SPAN Panel Feeder 3/0 AWG rated 200A, 200A >= 200A <br />PAGE <br />REV: A 11/5/2025 <br />ANNICE LIN <br />1852 W MEADOWBROOK DR, <br />SANTA ANA, CA, 92704 <br />PROJECT NUMBER: <br /> 109R-852LIN PR-3004558128 <br />SHEET <br />DESIGNER: <br />MAITENDRA SINGH <br />CUSTOMER RESIDENCE: <br />TEL. (714) 319-3666 <br />APN: 412-531-40 <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 />•Tag 1B: Inverter Input: 10 AWG rated 35.0A, 35.0A >= 22.34A <br />•Tag 2B: Inverter Input: 10 AWG rated 35.0A, 35.0A >= 22.34A