Looking for Interview Participants on the topic of Solar Energy

We are looking for people in the US with a solar energy system to talk to you about your experience.
You use solar energy to power your house? 
You have solar panels on your roof?
You sell energy back to the grid?
Great, answer a few questions and we will get back to you!
If you’re a match we will invite you for a 60 minute video call in July.
As a thank you for your time you’ll receive a 50$ Amazon gift voucher.
Click here for the english survey:


  • BB.BB. Super Moderators, Administrators Posts: 32,324 admin
    Soyavow4, you should start a new thread/discussion for your questions.

    The short answer there are websites that do predict the amount of sun for your location by month--You plug in your location and array direction/angle and it will show you how many hours of sun (by month) you can expect.

    Then plug in the hours of sun and use an equation like this:

    For Grid Tied systems (no batteries):

    XXXX Watt Array * 0.77 grid tied system eff * Y.YY hours of sun per day = Watt*Hours per day

    For an off grid power system, replace the "0.77" with 0.52 for off grid system efficiency.

    Several websites you can start with:

    http://www.solarelectricityhandbook.com/solar-irradiance.html  (simple program)
    https://pvwatts.nrel.gov/pvwatts.php (more complex program)

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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