Sunrun's Solar Terms

Browse our handy solar glossary and get expert definitions along with breakdowns for solar terms you'll be sure to run into.

Solar Terms

  • Net Energy Metering (NEM)

    Net Energy Metering (NEM)

    A practice in which utilities credit you for the excess electricity generated by your solar panels.

  • Off-grid


    An off-grid system is designed to help people function without the support of the utility grid.

  • Overproduction


    The energy that is generated above the committed level in a customer’s agreement.

  • Photovoltaic (PV)

    Photovoltaic (PV)

    Panels that are able to produce electricity from sunlight.

  • Power Purchase Agreement (PPA)

    Power Purchase Agreement (PPA)

    Pay a per kilowatt-hour rate for the electricity produced by the solar panels. 

  • Referrals


    When your referred friend goes solar with Sunrun, you may qualify for a referral gift.

  • Service Transfer

    Service Transfer

    If you sell your house, you can transfer your solar service to the new home owner.

  • Solar Array

    Solar Array

    Combining several solar panels creates an array, which is part of your solar system.

  • Solar as a Service

    Solar as a Service

    The business model Sunrun pioneered in 2007, allowing you to get solar for a low upfront cost.

  • Solar Battery Storage

    Solar Battery Storage

    A device that reserves energy for later consumption that is charged by a connected solar system.

  • Solar Cell Efficiency

    Solar Cell Efficiency

    The more light that hits the cells, the more electricity they produce.

  • Solar Cells

    Solar Cells

    Used to convert sunlight into direct electricity and are grouped together to make solar panels.