If you want year-round reliability, it's best to use the lowest of the figures or "smooth" the data. The peak amperage of the module you will be using can be found in the module specifications. You can also get close enough for this basic understanding if you divide the modules wattage by the peak power point voltage, usually (17 to 18.5).
 

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.

 

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