For example, a performance ratio of 80% means that the system is producing 80% of its rated output in real-world conditions. The performance ratio is expressed as a percentage, with a higher ratio indicating that the PV system is producing a greater percentage of its theoretical output. This ratio takes into account factors that reduce output, such as temperature, dust, snow, shade, aging of the panels and inefficiencies in the inverter. It compares the actual output of the system to the output it would produce under ideal conditions. The production ratio, or performance ratio, is an important measure of the effectiveness and efficiency of a solar system. Production ratiosĪ production ratio for solar panels helps you determine how much energy you can get from a panel. In reality, a more efficient solar panel will require fewer panels overall for your home, assuming all other factors are equal. So the higher the efficiency, the fewer solar panels you might need. "Scientists and technical developers of solar panels have been working hard for decades to try to make each solar cell on the panel able to convert more of the sun's light to electricity than before, or to make them more efficient," says Corda.Īs she explains, currently, the most efficient panels on the market have anywhere from 18% to 22.8% efficiency, with most panels hovering around 20% efficiency. If your roof has limited space for panels, you're going to want to get the most performance per square inch of panel that you can, explains Corda. But they're also more expensive, so bear that in mind if the solar budget for your home is tight. If you don't have much space, you might want to invest in solar panels with higher efficiency and wattage ratings since they're equipped to generate more energy per panel.
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