A single solar panel costs between $120-$315 for the equipment only, or $1,000-$1,200 when professionally installed. How much does a silicon solar panel cost per square meter? 1. This cost range constitutes the manufacturing expenses, transportation fees, and installation charges that may. System purchases offer dramatic savings: Buying panels as part of a complete solar system costs 40-65% less per panel ($0. 50/watt) compared to individual retail purchases ($0. 5 kW system, but prices can vary from as little as $7,700 for smaller solar systems to upward of $34,700 for larger systems. This typically translates to about $2. 50 per watt of installed capacity (more on price per watt below). While that price tag seems steep, the electricity.