House is facing South, but I'm laying them flat on the floor for economic and aesthetic reasons, with some 3D printed brick-based ballast [1].

Buying supports for PV is actually less economical than buying additional PV panels.

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[1] https://imgur.com/a/tDPevmM

Mine was around 4 years and its west south + a tree in the middle. So spring and autom the tree is no problem but in summer lunch hpeak there is shadow on it.