“Price per watt” is how installers price solar systems. As the name implies, this is the price you will pay for each watt of electricity your system is rated to produce. Each solar panel comes with a wattage rating. This rating is the amount of DC (direct current) power the panel produces under test conditions. So, a panel rated at 300 watts produces that much power output. A solar system made up of ten 300 watt panels would produce 3,000 watts*. Let’s assume that system costs $10,000. Doing the math, the cost per watt of the system is $3.33. $10,000/3,000 watts=$3.33/watt