OP
FB.
Actually, I think you'd be surprised. Which is why PV Sol is such an excellent piece of software.
You can try different string set ups and it will recommend a best option. No guess work. I've been trying to post a video to show you what I mean.
My concern - and reason for suggesting a left/right split - is there are two different causes of shading, and the shading is at different times of day.
The left-most panels are affected by the chimney in the afternoons and evenings at any time of year.
The lower row of panels are affected by the neighbour's roof around mid-day in winter.
I worry that mixing left and right might end up with a complex mix of shading almost all day. But by splitting off the right-most eight panels they benefit from no shade at any time of day during spring, summer and autumn (when about 90% of annual generation occurs).
But as already said by others: two strings and getting the inverter to scan the voltage should keep losses to manageable levels. However you configure it I would expect it to meet the SAP-2009 estimate for a 3.7-4kWp array that isn't shaded.
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