As a way to get the best value and worth to your system we would always advise sourcing a number of prices from competent installers. While we don’t specifically monitor 20kW systems, we do monitor 10kW & 30kW pricing – historic pricing trends for 30kW systems can be observed within https://yoursocialpeople.com/story3386132/the-5-second-trick-for-solar-panels-perth