Surface-to-air missile. An artist's depiction of a Soviet surface-to-air missile system engaging two F-16 Fighting Falcons. A surface-to-air missile (SAM), or ground-to-air missile (GTAM), is a missile designed to be launched from the ground to destroy aircraft or other missiles. It is one type of antiaircraft system; in modern armed forces, missiles have replaced most other forms of dedicated antiaircraft weapons, with anti-aircraft guns pushed into specialized roles.
Therefore, production year may directly affect the lifespan of your solar panel. The EU energy institute suggests that the large majority of solar panels produced in the last 10 years will have about a 30-year lifespan, as opposed to the 20-year lifespan previously estimated. New panels may reach up to 40 years of life.
The federal tax credit covers 30% of the solar system cost, and in some states there are additional local and utility rebates to offset retail price. You own the solar panel system and its expected useful life is 30+ years. On average, top tier electricity prices have increased about 5% per year for the last 30 years.