Annual Solar Insolation (tilt angles for solar panels) for Los Angeles, CA

Los Angeles annual Insolation

This is a chart of annual Insolation (solar energy) for the city of Los Angeles. It shows the optimum angle and azimuth for receiving power from the sun. This can be used for finding the optimum tilt and azimuth angles for a solar power array. What this means is – if your roof is angled at about 30 degrees facing due south or south by southwest you will be able to receive the maximum amount of solar energy available. So if you have a roof like this and you want to go solar DO IT!

This chart is available for viewing at:


About peaksunhour
Solar Power Technician /Site Surveyor? Installer. NABCEP qualified, OSHA qualified. Solar Power, NEC codebbok courses at Los Angeles Trade Tech College. Installlation experience with Grid Alternatives, Greenway Solar, and others. 20 years of Live Sound Experience, 30 years of experience with electronics.

3 Responses to Annual Solar Insolation (tilt angles for solar panels) for Los Angeles, CA

  1. Lorri says:

    Hi John, I found your site while trying to figure out if it is viable to mount solar panels on a vertical wall in Los Angeles. The wall is south facing but I was never good at geometry and don’t really know how to make sense of this data. Could you please advise me?

    • peaksunhour says:

      If you look at the chart you will notice that at 90 degrees (vertical) the solar array will give you about about half of the annual production that you would get if you mounted it with a 30 degree tilt referenced to the horizon. You will need twice as many panels to produce the same amount of power. A south facing rooftop install is better – even on a flat roof (observe 0 degrees). I have never seen a solar array mounted on a vertical wall except for areas near the north and south poles.

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