The average kW size for a residential solar installation system can vary depending on several factors, including the size of the home, the household’s energy usage, and the geographic location of the home.

That being said, a typical residential solar installation system in the United States is usually between 5 and 10 kilowatts (kW). A 5 kW solar system can generate approximately 6,000 kilowatt-hours (kWh) of electricity per year, while a 10 kW solar system can generate approximately 12,000 kWh per year.

The exact size of the solar installation system needed for a particular home will depend on factors such as the energy consumption of the household, the available roof or ground space for solar panels, and the local climate and weather patterns.

It’s recommended to consult with a professional solar installer to determine the appropriate size of the solar installation system for a specific home and energy needs. They can perform a detailed assessment of the home’s energy usage and site conditions to recommend a solar system size that meets the homeowner’s energy needs and budget.