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...
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That doesn't seem right to me. (current staying the same) Shading does reduce the current and it also reduces the voltage a little. I have some numbers in my notes somewhere from when I was playing with a towel on parts of my panel.
Imp is just what you get when you divide input watts by the Vmp. I see it as a result not a cause. (Maybe that is backwards though) I was wondering where the input watts (VA) came from in the first place and how it is affected by shading one panel.
I don't really like the current bottleneck explanation, because Imp happens after the array, not amongst the array where a bottleneck might exist at one panel. I am thinking it is two different sets of current. After a while it will come clear as these things do, but there is no reason for you guys to get all tangled up.
Imp is just what you get when you divide input watts by the Vmp. I see it as a result not a cause. (Maybe that is backwards though) I was wondering where the input watts (VA) came from in the first place and how it is affected by shading one panel.
I don't really like the current bottleneck explanation, because Imp happens after the array, not amongst the array where a bottleneck might exist at one panel. I am thinking it is two different sets of current. After a while it will come clear as these things do, but there is no reason for you guys to get all tangled up.
