A 1-story house in Philadelphia has a 15'x 40' (4.57 m x 12.19 m) south-facing roof tilted at 40° (latitude). It is not shaded by trees or neighboring buildings.

Design a rectangular solar array for the house that will fit on the roof and produce at least 10 000 kWh/year for the homeowner. Your design should conclude with a sketch of your array - how many rows and columns of panels, and how are the panels oriented? Show all of your work, verifying that your design will produce the needed energy, no guessing. Overproduction isn't helpful because the local utility won't compensate the homeowner for that energy and the extra panels are an extra expense so keep close to the minimum yearly desired energy.

Here's what you have to work with:

Your panels have a peak power of 320 W and a 19% conversion efficiency. The peak power is that delivered with an input of 1000 W/m^2

The PV panel size is 39. 4' x 65.6" (1.00 m x 1.67 m). Array layouts have zero gaps between panels.

Philadelphia receives an annual average solar irradiation of 4.6 kWh/m^2/day on a south-facing surface tilted at the latitude angle. This is also described as 4.6 peak sun hours per day, where this represents the number of hours at 1000 W/m^2 irradiance per day.

1) Number of rows of panels?

2) Number of columns of panels?

3) Orientation of the panels - Enter Portrait (long axis vertical) or Landscape (long axis horizontal)

Answer rating: 100% (QA)

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