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Does Tesla install solar panels at an angle?

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I just ordered a 4kw system through the Tesla website (love the ease and simplicity, but it's really light on details). I only have two sections of roof available for the install, one flat EPDM section, and one section that actually slopes to the north a few degrees. Because of this, it would normally make sense to mont the panels at an angle, but I can't tell if Tesla does this. Does anyone have experience with this?
 
they will not do that, only portrait or landscape... i'm currently talking to a local installer to see if they can do that.
It might be worth the premium to do that. A couple hypotheticals at different tilts on PV Watts could tell you the difference in estimated production. Especially on a flat roof. If nothing else, even a small tilt on a flat roof would allow rain to wash off pollen and dust that other wise would accumulate around the edges and cut back production. That won;'t show up on any PV Watts estimates but I have one location that is mounted flat and unless we really get a good downpour I see a small degradation over time.