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Inverter efficiency: why your home battery misses its 96% at night

The datasheet of a home battery often gives an efficiency of about 96%. At night it does not reach that. When discharging, the Conow Atlas 6000 AC reaches 94.8% at 500 W and 78.8% at 100 W. The difference is the fixed loss: what the inverter costs to be on. With the loss in watts instead of the efficiency in percent, the curve becomes simple, and the peak sits in the middle, not at full load. With the measurements per step, the count on the CEC list, a worked example and the sources.