ok, I'm having this same problem.
I have the
Rich Solar 800 Watt Solar Kit.
I have the 4 panels wired in sequence. but I'm getting the error E10 which when I look up, is "Photovoltaic component over-voltage".
This last weekend, I unplugged one of the panels, and the error went away, and it started charging again.
But I want that 4th panel plugged back in.
I get having 2 sets of 2 panels.
Then I assume, they'd connect back together before going into the charge controller? Like using the
Y-branch connector or
Y-branch adapter?
But in my head, that wouldn't change anything. the same amount would still be coming in, right?
I know I'm missing something.
The picture on that 800 Watt Solar Kit is what I was thinking might need to be done (but was not the example that was on their site when I purchased and installed my kit earlier this year.