Week 13 Problem Statement:Professor Hannigan is interested in having a Solar PV system installed at his house. He would like the system to be able to cover all of his average energy needs, and be capable of covering 30% of his absolute peak energy needs (i.e. if everything were running at its maximum capacity) at ANY time of the year. Below is a table showing the energy use in the Hannigan household and some specs for the system Professor Hannigan wishes to use.

Using table A2.6c for solar irradiance at 40 degrees latitude, design a PV system for the Hannigan household giving the total surface area of PV cells, the panel configuration (see example 9.4) , and the battery configuration. Once you have the system designed, estimate how much it would cost for Professor Hannigan to install ONLY the PV cells and how long it will take before he gets a return on the investment, if ever (assume $6 per peak watt, interest rate of 7%, and inflation rate of 3%). Lastly, estimate how long it will take for the system to generate the amount of energy it took to produce the PV cells.

Hannigan Household Energy Use:

Load Type Power (W)

Run Time

(hrs/day)Energy

(Wh/day)

Day Time Energy

(Wh/day)Night Time

Energy (Wh/day)  Average Peak        

Day Time Lights 100 500 5 500 500 0Night Time Lights 400 1000 6 2400 0 2400Refrigerator 13 700 24 312 156 156Heating/Cooling 500 3500 6 3000 1500 1500TV 60 60 2 120 60 60Water Pump 300 1900 3 900 450 450Oven/Stove 1000 5000 1 1000 500 500Computer 10 300 4 40 20 20Dishwasher 1500 1500 0.5 750 375 375Kitchen Appliances 500 1500 3 1500 750 750Misc Electronics 25 200 10 250 125 125Water Heater 500 3800 2.25 1125 562.5 562.5Washing Machine/Dryer 3500 5000 0.40 1400.00 700.00 700.00

System Specs: .01 m2 individual panel surface area Average Dark Current Density and Short Circuit Density of the panels at 40 C and

900 W/m2 are 1.8x10-8 amp/m2 and 200 amp/m2 respectively (see example 9.3) Batteries are 10 V and 150 amp-hr