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Inverter Performance Ratings

These inverters are eligible for the California Solar Initiative and generally considered acceptable for use throughout the United States. The most important result is the Efficiency Rating, or the ratio of the usable AC output power to the total DC + AC input power.

The inverter ratings are the result of real-world performance tests conducted by a Nationally Recognized Testing Laboratory in accordance with the protocols adopted by the California Energy Commission. The ratings follow standardized test procedures to establish and verify minimum levels of safety, reliability, quality and performance.


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about Inverter Performance Tests

The existence of photovoltaic (PV) product listing procedures (UL1703 for PV modules, UL1741 for inverters) has gone a long way in providing consumers and building and electrical inspectors with the necessary assurance regarding safety and installation requirements. Currently, there is no standardized method or testing body for inverter performance. With hundreds of thousands of inverters installed in grid-tied PV systems worldwide, there is clearly a market for these products. The development of standard test procedures and a corresponding certification program that delivers accurate, believable estimates of inverter performance and, ultimately, system performance, is needed to ensure that market claims and customer expectations are being met.


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