Solar Photovoltaic (PV) panels convert the sun's energy into electricity to be used by your home's electrical system. This electricity produced by the panels are converted by a device called an "inverter" and connect to your main power panel. These systems are often called grid-tied or grid-connected systems and offer no backup power during an outage by the utility company. A battery back up system can be installed for powering the essential loads of your home during an outage.
Grid-tied systems are the most common and produce power during the day typically when no one is home and will send any excess power back onto the utility grid while spinning your electric meter backwards. Each month your bill will be lowered by the amount of electricity your PV system has put back on the grid thru an agreement with the local utility called "Net Metering". This will be a direct offset from the amount of electricity you use each month
Life expectancies and manufacturer warranties of over 25 years for these systems make them a long term "Win-Win" investment for your future utility consumption and the environment. Rebates and incentives are available from Federal and most state and local governments and will help offset the installation of a new PV system for your home or business.
Net Metering is mandated by the public service commission to allow for the excess electricity you produce to be used out on the grid and bought back from you at the full consumer rate. This means the utility must reimburse at the same rate they charge you to use the electricity. Maryland, Washington DC, Virginia, Pennsylvania & Delaware have Net Metering agreements with all of the utility companies. It is possible to have a credit for the electricity you produce to carry over from month to month and only pay the utility for the "net consumed" electricity not offset by your PV system.