Yearly Solar Energy

Does a house in a given location in California receive the same amount of solar energy from year to year? If not, how drastic are the differences in power?

When we design a solar system we are using data based usually on 30 or more years information about a given area. We are using the average data for that area and yearly variations may be as much as 10-15%. In the long run the system will usually produce the average energy expectations we used in designing the system..

However, with global climate change we might expect even larger swings in yearly variations and a change in average solar data. Most likely those changes will result with the solar system average exceeding the average energy production estimated. This is something only time will tell.