I’ve got solar panels facing the wrong directions at the wrong angle — and they work. After 3 years with panels at 28 degrees, 6 degrees, southeast and northwest, here’s what the data actually shows about solar panel angle in the UK.
My system: 5 panels southeast and 4 northwest on a garage roof (28 degree slope), plus 8 panels on a nearly flat gazebo (6 degree slope). The difference between the two? Less than 10%. That surprised me too.
What I cover:
– The optimal angle for UK solar panels is 37.5 degrees south — but what if you can’t do that?
– Why diffuse light on overcast days makes direction almost irrelevant
– How my 6 degree flat roof gazebo compares to 28 degree garage panels
– Normalised output per panel: which angle actually wins?
– How I connected 3 strings to a 2-MPPT hybrid inverter using a generator port
– G98 to G99 upgrade process
– Why more panels at a bad angle beats fewer panels at the perfect angle
My setup: Sunsynk 3.6 hybrid inverter, 15kWh battery storage, Growatt 2kW string inverter on generator port. Built the garage array in 2023 and added the gazebo in 2024.
If you’ve got a non-ideal roof — flat, north-facing, east-west — this video shows you what to expect with real UK generation data.
Website: https://solarenergyconcepts.co.uk
Wall-mounted solar panels video: https://youtu.be/emAul4ozc1Q
Overpanelling explained: https://youtu.be/YN5XRF_JXuQ
DNO G98/G99 registration: https://youtu.be/sUHyiG7EwOU
#SolarPanelsUK #SolarPanelAngle #diysolarsystem
## Chapters
0:00 Wrong angles, wrong direction — and they work
0:28 The “optimal” UK solar angle: 37.5° south
0:47 Should you give up on solar?
1:35 My system: SE and NW garage arrays
2:05 First summer: battery full, zero grid imports
2:52 Diffuse light doesn’t care about direction
3:18 Why I needed more panels
3:35 Building the flat roof gazebo array
4:17 Yield comparison: 28° vs 6° tilt
4:38 All three strings on one graph
5:23 Sunny day vs overcast: the real contrast
5:29 Connecting 3 strings to 2 MPPTs
6:11 G98 to G99: the admin process
6:28 Total generation numbers
6:51 Per-panel output: gazebo vs garage
7:26 The flat roof downside: snow
8:04 More panels, more better
Read more at https://solarenergyconcepts.co.uk/post/panels-tilt/
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