Position of the solar panels on a southeast or southwest roof?

Hello, we need to decide where to place the solar thermal panels on our roof. There are 2 options... on the southeast side (red) or the southwest side (blue). The house is rotated 23 degrees from the north-south axis on the property. The roof has the shape of a cross roof. All roofs have a pitch of 25 degrees. Who has experience, who can help? Best regards, Steffi

We used the east roof. That was the decision of the architect, site manager, and heating technician.

If I remember correctly, I believe I have read that a south-western orientation is slightly higher than a south-eastern orientation.

I just realize that I have a flaw in my thinking... the panels are each oriented to the south (with a 23-degree rotation towards the west)... so the question would rather be whether the south gable casts a longer shadow on the right (red) or left (blue) side (or at all)?

We have now decided on the "rote" side. The decisive factor for us was the shorter way to the Speicher (as Olli also noted above) and the seemingly more "southern" side. Best regards, Steffi.

Hello Steffi,

even if it is probably already too late: I would have also included your usage behavior. That means, if you rather shower and bathe in the evening, you then need the hot water. Therefore, heating up in the evening would make sense. If you shower/bathe rather in the morning, the thermal system should better be under load in the morning as well. However - if you shower very early in the morning (before work), this makes little sense, as the sun might not be high enough yet.