For my understanding: Solar EVA sheets is "Solar Encapsulation film". An example I found in http://www.hanwha.de/sales-business/eva-sheet/. Is it correct?
I guess the best way is not using phenolic antioxidants. However if you really need to add AO agent into the encapsulant how about liquid type Tris(nonylphenyl) phosphite? If I were you, I use more HALS such as Tinuvin 770 instead of the phenolic AO agent.