How to output the solar radiation data received by exterior walls in E+?

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If I understand correctly this is the outpout you need: http://bigladdersoftware.com/epx/docs...

You can add Surface Outside Face Incident Solar Radiation Rate per Area in the Output:Variable of your idf.

first you have to simulate your model. Then go to OUTPUT:VARIABLE. Then create a new object, in variable Name search "Surface Outside Face Solar Radiation Heat Gain Rate"