There is quite a lot of literature available on the net indicating that straight up is indeed the best direction for a panel in diffuse light.
Diffuse light solar panels.
A total of four lights in this four pack of maxsa innovations mission style deck lights help keep stairs and decks usable after dark.
Of this amount about two thirds ultimately reaches the ear.
The steeper your solar panels are tilted the less of the sky they are facing and the more of the sky s diffuse radiation they miss out on.
Then use your hand to shade the solar panel.
Incorporated solar panels charge these lights for a more cost effective performance while textured glass panes diffuse light evenly in all directions.
However since diffuse radiation is generally pretty equally distributed throughout the sky the most diffuse radiation is gathered when your solar panels are laying down horizontally.
This is called global radiation.
Hold your hand about one foot from the solar panel.
This number represents the total light energy shining on the panel.
It is probably also beneficial to use a panel type optimised for the wavelengths that make it through cloud best.
Measure how many milliamps it produces.
Diffuse sky radiation is solar radiation reaching the earth s surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere.
Approximately 23 of direct incident radiation of total sunlight is removed from the direct solar beam by scattering into the atmosphere.