Overview
System type: Off-grid solar-electric
Location: Peterborough, New Hampshire
Solar resource: 4.6 average daily peak sun-hours
Record Low Temperature: -23°F
Average High Temperature: 79°F
Average monthly production: ~ 600 AC kWh
Percentage of required energy produced by the system: 95%; generator used 8 to 10 hrs. per week during the winter
Equipment
Modules: 42 modules: 27 Sharp 160, 160 W STC, 22.8 Vmp, 7.02 Imp, 28.4 Voc, 7.82 Isc; 15 Sharp 167, 167 W STC, 22.8 Vmp, 7.33 Imp, 28.9 Voc, 8.16 Isc
Array: Three 14-module series strings, 6,825 W STC total, 319.2 Vmp, 21.4 Imp, 400 Voc, 23.8 Isc
Array combiner box: Three strings run into fused DC disconnect, paralleled in wiring gutter before inverter
Array installation: Unirac SolarMount Light Rail, installed on south-facing roof (15° east of south), 45° tilt
Inverter: SMA America, Sunny Boy 7,000US, 600 VDC maximum input, 250–480 VDC MPPT operating range, 7,000 W AC, 240 VAC output
Charge controller/battery inverter: Two, SMA America Sunny Island 5048
System performance metering: Sunny Web Box
Backup generator: Kohler 12 kW residential model
Batteries: 24 Surrette S460, 1,050 Ah at 48 VDC
