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Founded in 1979, Solar Oregon is a 501 (c) (3) non-profit membership organization providing public education and community outreach to encourage Oregonians to choose solar energy.
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What size system do I need for my house?

Contributors: Markus

Solar systems are sized according to many criteria. Available roof area, orientation, shading, energy offset considerations, and your budget are all factors that may come into play.

 

Solar systems are sized according to many criteria. Available roof area, orientation, shading, energy offset considerations, and your budget are all factors that may come into play.

The average household in Oregon consumes about 10,000 kWh per year. A 3kW (3000 watt) solar electric system may produce as much as 3200 kWh in the Portland area and even more in other parts of Oregon. This means that you can easily reduce your electric bill by 30% or more.

It’s best to consult with one or more contractors and discuss your needs and desires. Have your utility bills ready so that your contractor can better advise you. A solar electric system, also known as photovoltaic or PV system, may produce more power than you consume in the summer time. In that case the utility will give you a kWh-credit, which you can use at a later time when you consume more than your system produces.

Solar hot water systems are also sized to your needs. Generally they take up less roof space for the same amount of energy produced and cost less upfront. They can often reduce your water heating bill by 50% or more.

 
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