Overview
System type: Grid-tied PV with battery backup
Location: Ashland, Oregon
Solar resource: 4.9 average daily peak sun-hours
Production: 822 AC kWh per month
Utility electricity offset: 109%
Photovoltaics
Modules: 42 Mitsubishi PV-MF170EB3, 170 W (STC), 24.6 Vmp, 6.93 A Imp, 30.6 Voc, 7.38 Isc
Array: #1: Three, 10-module series strings; 5,100 W STC, 306 Voc; one 12-module string, 2,040 W STC
Array installation: DP&W Power rail mounts installed on south-facing roof, 33° tilt (installed parallel to roof plane)
Energy Storage
Batteries: Eight Discover sealed AGM L16-type, 6 VDC nominal, 390 Ah at 20-hour rate
Battery bank: Eight 6 VDC nominal, 390 Ah total
Battery/inverter disconnect: 2 175 A breakers
Balance of System
Inverters: Fronius IG5100, 5,100 Wp, 150–450 VDC operating range, 500 VDC maximum, 240 VAC output; two OutBack GVFX-3648 inverters, 7,200 Wp, 42–68 VDC operating range, 68 VDC maximum, 120/240 VAC output
Charge controller: OutBack MX60
System performance metering: Fronius (built-in); two Austin International production meters wired into the output of the OutBack inverters (these meters are configured to accurately measure PV production and hence do not add in energy pulled from the grid to feed AC loads or to charge batteries); utility kWh meter
