Panel Production

[jetsurgn]

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!

[sensij]

Use PVWatts. Premium panels, loss factor of 8-10%.

[DanKegel]

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.

[J.P.M.]

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.

[bcroe]

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