this post was submitted on 17 Nov 2024
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All the new houses around here with no solar would indicate that is not true. They're not even required to have a south facing roof.
At least here in California, having solar panels on a non south facing roof usually only reduces production by 10-20%, as long as it's not entirely north facing. Solar systems are often slightly undersized - it's more cost effective to size it so it handles average load rather than the summer peaks you only see for a few weeks per year - so the actual difference for a given system may be less.
With my system, I see the best output from south-east facing panels since they get the morning sun. West facing panels are also fairly popular here due to time-of-use electricity plans. Some electricity plans have peak pricing from 4 to 9 pm, so people want to try and collect as much sunlight as possible during that period before sunset.
The UK is a lot further north, and it's probably not a massive loss.
It was enough to prevent me getting "free" solar panels (while that was a thing) though, so I'm still salty about that.