Tigo Product Selection Tool Have more questions? Submit a request Comments Adrian Tindall August 30, 2014 11:42 You just have to over type all the selected text and it work for me William Eckermann October 30, 2014 23:00 Design tool assumes you are using the same modules. What about putting together a system where mis-matched panels need to be used eg for a system expansion where the original panels are not available? Gal Bauer December 29, 2014 17:47 @William: For these systems see the following article: https://support.tigoenergy.com/hc/en-us/articles/203419277-Mix-and-Match-Different-PV-Modules Combine with the proper 2ES model according to the PV modules' spec and layout (portrait or landscape). The number of GW and MMU can still be taken from this calculator - simply make sure to have the same number of total panels in the tool as in the actual system.