FAQs

Think of a solar array as a long-term home-energy investment. Most panels are designed to produce electricity for at least 25 years and can continue operating beyond that period at a gradually reduced output. Microinverters may last for much of the system’s life, while a central inverter could require replacement sooner.

The right size depends on electricity use, available roof area, orientation, shade, local weather, and your goals. Solar capacity is measured in watts, and a provider uses a site assessment plus your recent utility history to estimate an appropriate number of panels.

Solar panels have no moving parts, so routine maintenance is generally limited. An installer may recommend occasional inspections, especially after severe weather. Depending on the equipment, the inverter may need service or replacement during the life of the array.

Energy payback time is how long a panel must operate before it produces more energy than was used to manufacture it. The exact period depends on the panel technology, manufacturing process, location, and available sunlight.

A battery stores electricity produced by the panels for later use. Many homes remain connected to the utility grid without storage, while others add a battery to use more of their own solar production or to support selected circuits during an outage when the system is configured for backup power.

Roof orientation, shade, usable area, age, and structural condition all matter. South-facing surfaces often receive strong annual sunlight in the northern hemisphere, but east- and west-facing roofs can also work. Flat roofs allow installers to choose the panel angle with a mounting system.

Most jurisdictions require permits and an inspection for a residential solar installation. Requirements vary by municipality and utility. A qualified installer typically prepares and submits the required plans as part of the project.