How to Detect the Efficiency of Photovoltaic Panels: A 2023 Technical Guide
You know, solar panels aren't getting cheaper - the average residential system costs $18,000 in 2023. But here's the kicker: 23% of installations underperform within their first 5 years according to a recent NREL field study. So how do we catch these efficiency drops before they burn holes in your ROI?
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