Ampicity of two combined strings

[SAP]

I just want to know if I'm doing this right
isc 8.89x2=1778x1.25=22.22=10 AWG thanks

 

[Smart $]

Think of it like batteries, parallel versus series.

 

[SAP]

Thanks ,is the formula I used right not considering voltage drop, ambient temperature are 1"off the roof are 3" off the roof thank you

 

[Smart $]

Given what I replied, what do you think?