How to calculate the monthly solar energy radiation on vertical surfaces with different angles to north?

I would like to have the monthly ‘direct’ solar radiation (W/m2) on vertical surfaces (walls) with different angles to north for different latitudes. Does someone has a solution? Thanks!

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You can use the ‘LB directional solar irradiance’ component, by inputting the cardinal directions into the ‘surface azimuth’ input and 0 into the surface altitute to calculate for vertical walls.
Then use the ‘LB time interval operation’ to post-process for the monthly solar radiation.