The cost of thin film solar panels can vary greatly depending on the size, brand, and where they are purchased, but generally range from $0. However, the complete installation costs including labor and additional equipment can bring this up to $2. 20 per watt, influenced by various factors. Location, market demand, and manufacturer reputation also play significant roles in price determination. It should. These panels typically cost around $0. 75 per watt, with total system prices for an average home ranging from $9,000 to $15,000, depending on installation needs. Most people find that thin-film solar panels are less financially worth it than traditional rigid. Solar panels typically cost $12,400 to $37,200, with a national average of $24,800 for an 8kW system. We compared research from government and solar.