Originally Posted by mitiempo
For a 36 cell panel there are usually 2 bypass diodes. Still adds up to a loss if multiple panels are in series. Parallel doesn't have any issues with current
from one panel passing a shaded panel.
Yes some do, but most good panels have more. The Popular Kyocera
panels for example have 8 in the most common sizes from 50-140w.
I think parallel is best, but it not correct, when wired in series, to think that the array will produce no current when one panel is shaded.
If one panel is totally shaded parallel connection does not lose any voltage with the current passing through the shaded panel like a series connection does as you point out. However, with partial shading series connection can contribute voltage to the output whereas parallel connection often cannot contribute anything.
The theoretical mathematical modelling of series and parallel connection is complex. It has defeated me anyway