Are residential solar panels worth it? Estimate residential solar panel cost. Solar panels aren’t cheap: with installation, an average residential 5kW size system runs between $3 and $5 per watt, or $15,000 to $25,000, before tax credits and incentives, according to the Center for Sustainable Energy. Global Solar Supply is a premier , US based, provider of solar panels, solar batteries, solar inverters and any other accessories needed for solar power systems. Solar system Engineering, Consulting, Advice Renewable energy is the future.We are also a certified C-10 electrical contractor, fiber optics level 2 installer, troubleshooter, and thermal imaging level 1 …