They also only last between 10 to 20 years, which is 10 to 15 years ... Since solar panels cost between $2.40 and $3.60 per watt, the more energy your solar panel system needs to produce, the ...

Solar panels typically last 25-30 years ... which works out to $5.20 per watt. California's average cost per watt is currently $2.47. The difference comes down to efficiency and materials ...