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    Is there a general rule of thumb for system generation? I had one installer tell me to expect 1KW per panel per day on average in SoCal.
    Thanks!

  • #2
    Use PVWatts. Premium panels, loss factor of 8-10%.
    CS6P-260P/SE3000 - http://tiny.cc/ed5ozx

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    • #3
      This is where the handwavy term "sun hours", or kWh/kW, comes in. Depending on your climate/location/shading/season, you'll get something like 4.5 kWh per day per kW of panel. But as the man said, use PVWatts for the real answer.

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      • #4
        Originally posted by DanKegel View Post
        This is where the handwavy term "sun hours", or kWh/kW, comes in. Depending on your climate/location/shading/season, you'll get something like 4.5 kWh per day per kW of panel. But as the man said, use PVWatts for the real answer.
        Or at least a better dart throw. Read the help/info screens before using. The units of that anachronistic term "sun-hours" might perhaps be more accurate if described as "kWh/((m^2)*(day)), with the caveat that it applies to a horizontal orientation.

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        • #5
          Originally posted by jetsurgn View Post
          Is there a general rule of thumb for system generation? I had one installer tell me to expect 1KW per panel per day on average in SoCal.
          Thanks!
          If you change that to " 1 KWHour per 250 W panel", you will at least be in the right ball park. Bruce Roe

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