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It is the rated maximum DC output of the solar panels under standard test conditions. It is a capacity label, not a guarantee that the system will produce that power all the time." } }, { "@type": "Question", "name": "What is the difference between kWp, kW and kWh?", "acceptedAnswer": { "@type": "Answer", "text": "kWp is the peak rated capacity of the solar panel array. kW is instantaneous power, often used for inverter output or appliance demand. kWh is energy used or generated over time, which is what you see on electricity bills and solar generation forecasts." } }, { "@type": "Question", "name": "How do I calculate the kWp of a solar system?", "acceptedAnswer": { "@type": "Answer", "text": "Add together the watt peak rating of all the panels, then divide by 1,000. For example, ten 400 Wp panels make 4,000 Wp, or 4 kWp. 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