Whether EPDM rubber, TPO, or another material, solar panels can also be installed on your flat roofs – without any penetrations. These are called ballast mounts.
Our solar panel cost calculator uses your address to scan your roof, giving you a custom, accurate, and quick cost estimate for your future investment while also connecting you to local contractors near you! The current average price for a solar system in the USA is $45,160.
For most residential properties, a roof with a slope between 30° and 40° is considered optimal for solar panel installation. This angle allows solar panels to lie flat against the roof without requiring additional adjustments, making it easier to install standard racking systems.
But why does a 5kW residential system cost $8,000-$12,000 in Port Moresby when the same setup goes for $6,500 in Australia? Well, here's the thing—PNG's solar imports surged 165% year-over-year in Q4 2024, but prices haven't followed global downward trends.
As of April 2026, the average solar panel system costs $2. 22/W including installation in Georgetown, TX. 55 kW system (the average system size in Georgetown, TX), this comes out to about $23,421 before any available incentives, though prices range from $19,908 to.