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Mixing old and new solar panels in a system, particularly with a solar pump, can cause mismatches in voltage and current outputs. Older panels typically have lower efficiency, forcing newer, more powerful panels to operate at reduced capacity. This leads to underperformance and inefficiencies, reducing the energy yield and potentially increasing maintenance costs.

Shading reduces solar panel efficiency by as much as 5-25%, and even partial shading can result in power losses of up to 90%. This can cause the solar pump system to stop working entirely if the power generated is insufficient.