You have a point. Two things are happening at the shaded cell. You got the reduced irradiance of the shaded cell forward biasing the cell and you got a much higher current from the other cells trying to get through this cell, causing a negative voltage drop. If the negative voltage drop wins out then the bypass diode will conduct.
http://www.pveducation.org/pvcdrom/modules/bypass-diodesI based my initial thoughts on a series test conducted by NBB (??). I believe he has 3 series panels. If one of the 3 panels is angled 45 degrees away from the sum (simulating shade), current production is drastically reduced.
LScamper wrote:
Salvo wrote:
"Taking this logic further, in a series configuration, the shaded panel t shat has 400W/m^2 irradiation will not conduct its bypass diodes. This string will have a total current about 2A, severely limiting production."
Not sure that is correct. The other cells are still producing their max current. Seems that the currents will add at the junction of the shaded cells and the not shaded cells. The current from the not shaded cells will forward bias the bypass diode so the short circuit current will be that of the higher current cells.?
