The limits of tailpipe CO2 emissions are getting lower worldwide and the automobile manufacturers are looking for both on-cycle and off-cycle technologies to reduce these emissions. Some new innovative technologies are being studied to help reduce emissions. The use of the so called eco-innovations such as a battery charging solar roof to claim off-cycle credits of CO2, is already regulated in Europe by the document “Technical Guidelines for the preparation of applications for the approval of innovative technologies pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council”. According to this document, the average solar radiation in Europe is 120W/m2. In Brazil, in which the latitudes are lower than in Europe, the weighted average solar radiation, according to the licensing trend has not been calculated yet. This work presents a weighted average solar radiation for Brazil, according to the state licensing trend for 2015-2025 and typical meteorological year analysis of the Brazilian solar radiation in main state cities. The objective is to use these data in calculations of CO2 off-cycle credits by using a battery charging solar roof.