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Extra info for A Guide to Photovoltaic (PV) System Design and Installation
Equipment ground according to NEC Table 250-122 on AC-side. 11. Negative pole of PV array referenced to ground at the Inverter. June 2001 COMPANY NAME Title: Example Grid-Tied PV System Drawn By: Date: Checked By: Scale: N/A Related Dwgs: DWG NO. Material: Page 29 EX-4 PV Installation Guide PV System Power Conditioning Unit + + + + + - - - - + + + + + - - - - + + + + + - - - - + + + + + - - - - - PV Circuit Combiner #10-2 conductor TC with THWN-2 conductors for all PV array wiring Photovoltaic Modules Continuous Equipment Ground Disconnect and GroundFault Protection 60 A DC+ POS DC/AC Inverter 1A 15 A, 5 plcs.
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. 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.
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. 10. Equipment ground according to NEC Table 250-122 on AC-side. 11.