B. Stand-alone System Design Design a stand-alone system for a house in San Antonio, TX. Electric Load Information (all loads are 120 Volts AC): 1. 15 compact fluorescent lights (15 W cach), 4 hrs day 2. One Energy Star 18.9 cu.ft. refrigerator (127 W). 9hrs/day 3. One clothes washer (1450 W). 4 loads of laundry per week, I load = 0.5 hr. 4. One gas clothes dryer (300 W), 4 loads per week, I load = 1 hr. 5. One TV (130 W). 4hrs/day 6. One VCR (40 W). 2 hours, 3 days/week 7. One laptop computer (40W), 8 hours/day, 5 days per week 8. One Microwave (1400 W), 5 minutes'day System specifications: DC system voltage: 48 Volts Days of autonomy: 4 days Battery Depth of Discharge: 50% Battery. Flooded Lead Acid 350 Ah, 6V, 80% efficiency PV Module: Rating: 85 W. 12 V Max. Power Current - 5.02 A, Short Circuit Current = 5.34 A Max. Power Voltage = 17.4 V. Open Circuit Voltage = 21.7 V Controller. 48 Volt nominal Max. Pass-through Amps = 40 A (enough?) loverter: Nominal DC input: 48 V AC output: 120 VAC Continuous Power: 4000 W(enough?) Continuous AC output: 33 A (enough?) Efficiency: 90% Surge Capacity = 95 Amps AC (enough?) There is no back up generator. PV array will be sel at tilt angle = latitude, year around Peak sun hours. The equivalent number of hours per day when solar irradiance averages ] k WAn'. For example, six peak sun hours means that the energy received during total daylight hours cquals the energy that would have been received had the irradiance for six hours been ] kW/m