Page 136 - Solar Power in Building Design The Engineer's Complete Design Resource

106 INTRODUCTION TO SOLAR POWER SYSTEM DESIGN

Isc (short-circuit current) 5.30 A

Imp (maximum peak current) 4.90 A
Maximum system voltage (V dc) 600 V

Input Assumptions

Inverter model 75 kW, 480 V ac

PV module SolarWorld AG SW 175 mono
Temperature scale Fahrenheit
Minimum ambient temperature 25
Maximum ambient temperature 90

Mounting method Ground mount/tilt
CEC or STC module power STC (standard test condition)
Optimum array derating coefficient 0.8

Voltage drop in array wiring 1.5

Resulting Design Parameters

Ideal number of series modules (strings) 11
Nominal Vmp w/11 series modules (V dc) 387

Minimum number of modules 11
Maximum number of modules 11
Maximum allowed number of modules 560
Maximum number of series of module strings 48

Inverter Output

Continuous ac power rating 75 kW
AC voltage (V ac line—line) 480 V, 3 phase
Nominal ac output current 91 A

Maximum fault ac output current/phase 115 A
Minimum dc input voltage 330 V dc
Maximum dc input voltage 600 V dc