Solar power workform for sizing your solar power project

Event Horizon - SOLAR ARRAY Sizing Work form
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This worksheet helps you figure the total number of solar modules required for your system. If you want year-round reliability, it's best to use the lowest of the Peak Sun Hours or "smooth" the data for seasonal applications. The peak amperage (maximum power) of the module you will be using can be found in the module specifications.

1. Total average amp hours per day from the System Loads Workform, line 10.

2. Multiply line 1 by 1.2 to compensate for loss from battery charge/discharge.

3. Average sun hours per day in your area.

4. Divide line 2 by line 3. This is the total solar array amps required.

5. Optimum or peak amps of solar module used. See module specifications.

6. Total number of solar modules in parallel required. Divide line 4 by 5.

7. Round off to the next highest whole number.

8. Number of modules in each series string to provide DC Battery voltage:

DC Battery Voltage	# of Modules in Each Series String
12	1
24	2
48	4

9. Total number of solar modules required. Multiply line 7 by 8.

NOTE: There are other factors that will influence the actual solar array sizing that are not refelected here. This form is intended as a courtesy to the general public, for your basic sizing understanding and close approximation of the PV array, but does not replace the more sophisticated system design input used by us when directly assisting our customers.