Solar charging with some shade
I'm facing west today, so I'm getting a pretty good shadow on one of six series-connected panels. Panels are all around 135w @ 12v. Shade is on the far-left panel - about half of it: No...
Forum Discussion
If that shaded panel is half by-passed, then it is putting out half its current? (I really am confused about the current amount)
So now the whole string is down to that same half-current? So why is Imp still 7.3a out of rated 7.6a and not more like 3.8a?
Vmp is way down at 77.8, but Imp is hardly down at all. Input watts is down from the low V, but the current bottleneck with series story is that it should be down from low current too.
In fact the OP photo shows the shade covering more than half the vertical columns (I think a couple un-shaded cells at the ends of the shaded columns don't count for anything--the column is killed?) So you would think all its current is shut off if it is a typical two diode panel 18 cells each. Whatever, the panel's output current should be low?
So is the sting output current the same as Imp or not? (if it is the same why is it not low?)
So now the whole string is down to that same half-current? So why is Imp still 7.3a out of rated 7.6a and not more like 3.8a?
Vmp is way down at 77.8, but Imp is hardly down at all. Input watts is down from the low V, but the current bottleneck with series story is that it should be down from low current too.
In fact the OP photo shows the shade covering more than half the vertical columns (I think a couple un-shaded cells at the ends of the shaded columns don't count for anything--the column is killed?) So you would think all its current is shut off if it is a typical two diode panel 18 cells each. Whatever, the panel's output current should be low?
So is the sting output current the same as Imp or not? (if it is the same why is it not low?)
