Average Solar Production In Oregon USA

Introduction – Data Source and Assumptions

Data is from the NREL.gov app for average solar radiation energy per day in Portland, Oregon. We used this reference point to compute the solar radiation energy production per day (in kWh/m²), which changes throughout the year according to the month. Each month is different due to the changing relative trajectory of the sun.

To get the monthly production, we simply multiplied by the number of days for each month. Finally to get the annual production, we added up all of the monthly values.

The average solar panel surface area is estimated to be 1.5 square meters. The efficiency of converting solar radiation into energy is estimated to be 15%.

Average Electricity Usage in Oregon and How Many Solar Panels You Need

The average monthly electricity usage in Oregon is 30 kWh per day, 916 kWh per month or 10992 kWh per year. Based on the data below, you would need 19-89 panels depending on the time of year to cover your electricity costs exactly. The variable factors are that electricity usage varies depending on how hot are summers and how cold are winters, and whether you use electricity based cooling and heating. Check with your solar system installer for exact numbers.

MonthSolar radiation per daySolar radiation per monthSolar energy per month 1 panelSolar energy per month 20 panels 
January1.51 kWh/m²46.81 kWh/m²10.53 kWh210.65 kWh
February2.87 kWh/m²80.36 kWh/m²18.08 kWh361.62 kWh
March3.41 kWh/m²105.71 kWh/m²23.78 kWh475.70 kWh
April4.66 kWh/m²139.80 kWh/m²31.46 kWh629.10 kWh
May5.49 kWh/m²170.19 kWh/m²38.29 kWh765.86 kWh
June5.98 kWh/m²179.40 kWh/m²40.37 kWh807.30 kWh
July6.92 kWh/m²214.52 kWh/m²48.27 kWh965.34 kWh
August6.42 kWh/m²199.02 kWh/m²44.78 kWh895.59 kWh
September5.21 kWh/m²156.30 kWh/m²35.17 kWh703.35 kWh
October3.18 kWh/m²98.58 kWh/m²22.18 kWh443.61 kWh
November1.94 kWh/m²58.20 kWh/m²13.10 kWh261.90 kWh
December1.47 kWh/m²45.57 kWh/m²10.25 kWh205.07 kWh
Average Solar Production in Oregon
Anne Lauer
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AnnaLauerisawriter,gardener,andhomesteaderlivinginruralWisconsin.ShehaswrittenforMotherEarthNews,Grit,andHobbyFarmsmagazines.Annaiswriting a new bookabout growingyour food for free and an ultimate guide toproducingfood at little to no cost.Whenshesnotwritingorgardening,Annaenjoysspendingtimewithherhusbandandtwoyoungdaughters.

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