I have a 3 week old install, 10x aSun Black Mono 250w panels running as 2 strings of 5, and a Fronius IG30 inverter. The original survey was for 16 panels (10 on the main roof and 6 on an extension roof) all facing SW with no shading.
We couldnt afford the £7K install for the 16, so plumped...