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Extra resources for A Guide to Photovoltaic (PV) System Design and Installation
AC In DCSurge Arrestor 20 A Inverter AC Disconnect NEG Existing Exterior Main Breaker Box 20 A Exterior PG&E Disconnect Box 30 A PV Array Grounding Conductor 3/4” EMT Conduit w/ #10 AWG THWN conductors Surge Arrestor Main House Grounding System Notes: 1. NEC Array Open Circuit Voltage = 95 Volts dc. 2. Max. Short Circuit Array Current = 45 Amps. 3. PV modules are Astropower model # AP100, UL-1703 Listed. Array consists of 20 modules – 5 parallel sets of 4 units in series. 4. 48-Volt DC, 240-Volt AC inverter, UL1741 listed.
3. PV modules are Astropower model # AP100, UL-1703 Listed. Array consists of 20 modules – 5 parallel sets of 4 units in series. 4. 48-Volt DC, 240-Volt AC inverter, UL1741 listed. COMPANY NAME Title: Electrical Drawing, Grid-Tied PV System Drawn By: Date: Checked By: Related Drawings: EX-4 Scale: N/A DWG NO. 6 19 25 31 39 50 62 80 112 189 Ampacity of 90 C Wet Wire Roof Mounted Modules (80 C) Ampacity of 90 C Wet Wire Rack Mounted Modules (70 C) Ampacity of 75 C Wet Wire Rack Mounted Modules (70 C) 10 12 16 23 31 39 N/A N/A N/A N/A N/A N/A N/A N/A N/A 15 17 23 32 44 55 N/A N/A N/A N/A N/A N/A N/A N/A N/A 7 8 12 17 21 28 N/A N/A N/A N/A N/A N/A N/A N/A N/A Ampacity of Ampacity of Ampacity of 90 C Wet Wire 75 C Wet Wire 60 C Wet Wire BOS Wiring (45 C) BOS Wiring (45 C) BOS Wiring (45 C) 22 26 35 48 65 83 96 113 131 148 170 196 226 278 374 To determine D-Factor for 1% voltage drop simply multiply D-Factor from 3% tables by 3.
Ground-Fault Protection required only on roof-mounted PV arrays. 4. DC Fused Switch rated at 60-amps, 125-Vdc (may be circuit breaker) 5. DC/AC Inverter rated at 2 kW AC output at 240-Volts and is Listed to UL-1741 “Utility-Interactive” 6. AC Fused Switch rated at 30-amps, 240Vac (may be circuit breaker) 7. Utility Switch is visible open, lockable in open position, 240-Vac, 60-amp switch. 8. 5 kW, 240-Volt inverter) 9. Equipment ground equivalent to PV array conductor size on DC-side of system.