Sweet Answer from Solar Mango: (updated Jul 2015)
Depending on the region and its DNI ( a measure of amount of sunlight available), the solar panel output for a 1 kW PV plant can be between 3-4.5 kWh of electricity a day on average, or 1100-1600 kWh of electricity a year.
We say average because these daily generation numbers are different throughout the year even for the same location. Thus, the same 1 kW solar PV power plant could generate even beyond 5 kWh during some days in summer and less than 4 kWh during some days in winter. Averaged over the year, the estimated solar panel output could be about 4.5 kWh.
There are exceptions to the range of 3-4.5 kWh/day/kW. There are parts of sunny California, Middle East and India that can generate even more than 4.5 kWh of electricity a day on average. And on the other side, some parts of Alaska could generate less than 3 kWh of electricity a day on average!
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