My PV array is 10 modules and uses the Enphase micro inverters, so each panel has its own inverter, and the power output from each panel can be indepenently tracked. So, I used pipes to make simulated wire shadows on some panels while using the output from the unshaded panels as a control.
|PV array with 4 of the panels shaded.|
|Closeup of "wire" shading.|
Here is the grand result showing power output form all of the panels for the two tests (big wires and small wires):
There is a lot more detail at the link below, with actual power drops for the eight different shading conditions I looked at.
All the details on PV array shading from power lines...
Another small shading investigation done earlier...