3. an average household in iowa consumes 4700 kwh of electricity annually. consider a pv solar system consisting of monocrystalline silicon modules, each rated at 200 w and have a surface area of 2 m2. assume the pv modules have an overall solar-electric conversion efficiency of 18% and an expected power output of 140 w in this system with the rated solar flux of 1000 w/m2. the system is grid connected and participates in net metering where excess electricity generated is "banked" and provided back to homeowner at no cost. based on this there is no need for storage. a. at what tilt should the pv modules be fixed to utilize greatest amount of the annual solar radiation?

b. based on the average solar resource determined in part (a), what is the minimum number pv modules that are required to generate 100% of the electricity used by the household?