Right, I'm pulling my hair out with this one. Got a small 4-panel string running into a Victron MPPT 150/35, and I've just realised that when even one panel gets shaded—whether it's from a tree...
The seasonal issue's been my biggest learning curve too. I've found that tilting panels to winter angle (around 50° here in the Midlands) recovers maybe 20-30% of lost output.
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