Solar panel installation labor costs typically range from $1. 50 per watt, with most homeowners paying between $15,000 and $25,000 for a standard 6–8 kW system. These expenses cover skilled work like mounting racks, wiring, and connecting to the grid—not the panels. Understanding the labor cost involved in solar photovoltaic (PV) installations is essential for accurate budgeting and financial planning. Labor costs are determined by various factors including geographical location, the complexity of the installation, and skill level of the workforce, 2. System Size Matters More Than You Think While bigger systems have higher absolute costs, they offer better value through economies of scale.