Overview
System type: Batteryless, grid-tied solar-electric
Location: Tucson, Arizona
Solar resource: 9 average daily peak sun-hours (for dual-axis tracking system)
Record low temperature: 6°F
Average high temperature: 100°F
Average monthly production: 1,104 AC kWh
Utility electricity offset annually: 87%
Photovoltaic System Components
Modules: 32 BP SX170B, 170 W STC, 35.4 Vmp, 4.8 Imp, 44.2 Voc, 5.0 Isc
Array: Four eight-module series strings, 5,440 W STC total, 283.2 Vmp, 19.2 Imp, 353.6 Voc, 20.0 Isc
Array combiner box: Square D HU361RB
Array installation: Array Technologies AZ-225 Wattsun dual-axis trackers on pole mounts
Inverters: Two Xantrex GT 3.0, 3 kW rated output 600 VDC maximum input, 195-550 VDC MPPT operating range, 240 VAC output
System Cost
Initial cost: $45,064
Less incentives: $16,320 TEP utility rebate
Final installed cost: $28,744
Major Load Information
Space heating: Electric forced-air heat pump
Cooling: Electric forced-air heat pump; evaporative cooling tower (electric fan)
Water heating: Solar hot water system, with propane backup
Cooking: Electric
Clothes drying: Electric
Refrigeration: Electric
