Photovoltaic outdoor with home on-site energy solar

Why are rooftop solar panels more affordable?

For homeowners, these global cost trends translate into more affordable rooftop solar installations. As utility-scale solar prices fall, residential systems also benefit from cheaper panels, lower installation costs, and more competitive financing.

Does rooftop solar really work?

In 2024, rooftop solar was the fastest-growing source of electricity worldwide, according to data from the U.S. Energy Information Administration. Yet many homeowners still hesitate because of cost, myths and confusion about how the technology actually works.

What are photovoltaic panels & how do they work?

They are designed for builders constructing single family homes with pitched roofs, which offer adequate access to the attic after construction. It is assumed that aluminum framed photovoltaic (PV) panels mounted on a “post” and rail mounting system, the most common in the industry today, will be installed by the homeowner.

Do I need to meter a photovoltaic system?

It is assumed that aluminum framed photovoltaic (PV) panels mounted on a “post” and rail mounting system, the most common in the industry today, will be installed by the homeowner. While metering the system is encouraged, the specification does not address system wiring elements for associated system sensors or monitoring equipment.

Can a solar inverter be installed manually?

This allows one to manually isolate the solar system from the home’s electric service panel and from the utility grid. Builders should be aware of these local requirements and make accommodations in the AC conduit run accordingly. The builder should not assume that the inverter installed will include an onboard manual AC disconnect switch.

Is rooftop solar cost-competitive?

However, according to a 2025 McKinsey article, rooftop solar remains cost-competitive in many markets, with the lifetime cost of electricity generated often cheaper than grid power.