Check breaker positions, visible damage, recent storms, and unusual new loads first. Compare yesterday to similar weather days last month. Try a safe reboot procedure if your manufacturer endorses it. Keep notes on times and temperatures; a clear, chronological log becomes invaluable when support asks detailed follow-up questions.
If afternoons sag while mornings shine, investigate shade movement, heat-induced derating, or mismatched string orientations. Panel-level monitoring can reveal one laggard dragging neighbors. Look for ventilation blockages or debris along lower frames. Photograph shadows at peak sun; those images clarify patterns no spreadsheet can capture for troubleshooting discussions later.
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