On 09/01/2022 21:58, Russ Garrett via Talk-GB wrote: >> And I presume "direction" is irrelevant when they are on a flat roof? > They're still angled when mounted on a flat roof (due south in this case). Ah, yes. Those ones were still tilted. You do occasionally get a set laid flat on a flat roof, though; tilted=no for those. -- Cheers, Jeremy