Licensed Solar & Renewable Energy in Portland, OR

Modern solar panels carry 25 to 30 year performance warranties guaranteeing at least 80 percent of original output. Most panels continue producing electricity well beyond 30 years at gradually reduced efficiency. Inverters typically last 10 to 15 years for string inverters and 25 years for microinverters. Battery systems carry 10 to 15 year warranties.

Residential solar systems typically cost between three and four dollars per watt before incentives. A typical 8 kW residential system costs between twenty-four and thirty-two thousand dollars before the federal tax credit. The 30 percent federal Investment Tax Credit plus state incentives can reduce the net cost by 30 to 50 percent. Prices continue to decrease annually.

Yes, solar panels produce electricity on cloudy days, though at reduced output, typically 10 to 25 percent of full-sun production. Modern panel technology captures diffuse light effectively. Annual production estimates account for local weather patterns. Regions with less sun can still achieve excellent returns because solar offsets electricity that would otherwise be purchased at retail rates.

Net metering is a billing arrangement where excess solar electricity sent to the grid earns credits on your utility bill. When your panels produce more than you use during the day, the excess flows to the grid and your meter effectively runs backward. You use those credits when your panels are not producing, such as at night. Policies vary significantly by state and utility.

Battery storage is optional but increasingly popular. Without batteries, grid-tied solar systems shut down during power outages for safety. Batteries provide backup power during outages and can optimize self-consumption of solar energy. They are most valuable in areas with time-of-use electric rates, frequent outages, or reduced net metering compensation.