The rated power output of a solar panel under standard test conditions (STC: 1,000 W/m² irradiance, 25°C cell temperature). A 400W panel produces 400 watts under ideal conditions — real-world output is typically 80–90% of kWp due to heat, shading, and angle losses. A 10kWp system produces roughly 13,000–15,000 kWh annually in East Texas.
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