Zone 1 6 hours
Zone 2 5.5 hours
Zone 3 5 hours
Zone 4 4.5 hours
Zone 5 4.2 hours
Zone 6 3.5 hours
The figures at the left
indicate 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
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.
Solar questions? Website problems? Please contact us.