Keep In mind that CNET does circuitously test any of your tools talked about in this or other solar tools assessments. We haven't passed through the purchasing system with Smartflower or other solar corporations. 20kW to 29kW 30kW to 39kW 40kW to 49kW 50kW to 59kW 60kW to 69kW 70kW http://extendingthebranch.com