Solar panels have become true investment goods. Manufacturers have been able to reduce their production cost and are now offering long warranties on performance with panel lifetime increased to twenty years or more. This is allowing users to really calculate a return on investment from savings on electrical power consumption and profits are increasing as a result. Needless to say, there is a great benefit for the environment with each additional solar panel mounted on a roof.Solar panels have become true investment goods. Manufacturers have been able to reduce their production cost and are now offering long warranties on performance with panel lifetime increased to twenty years or more. This is allowing users to really calculate a return on investment from savings on electrical power consumption and profits are increasing as a result. Needless to say, there is a great benefit for the environment with each additional solar panel mounted on a roof.