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The legend indicates the average (over the course of the year) amount of solar insolation (full sun hours) for these zones.
These figures are based on the yearly average; consequently, systems based on these figures will provide more power in summer and less in winter. Winter figures for daily solar gain may be from 25% to 50% less than these average figures.
We do have additional insolation data available for other parts of the world. Email us at [email protected] and give us the location of your solar project. We'll help you design your solar power system. You can also call us at 1-800-472-1142.