What if I already have an OG-100 or OG-300 certified product, can I add on listings?

You can obtain an ICC-SRCC Listing for any product that has an OG-100 or OG-300 certification (and certain commercial SHC components). Just go to the ICC-SRCC website to apply or e-mail srcc@solar-rating.org for more information. Be aware, though, that you can save money by applying for listings when you apply for your certification, where the application package fee is waived.