Inverter Efficiencies Inverter efficiency ratings are typically based on a partial power output point where maximum efficiency is achieved. With some inverters, efficiency may drop off on either side of this output. Consequently, it is prudent to match inverter capacity with the load as closely as possible. Manufacturers are continually improving designs. Check with the manufacturer or dealer for their efficiency rating and the wattage it is based on.
Some inverters draw power even when no appliances are operating.
This feature senses when a device is using the inverter, and turns off the inverter when all loads are shut down. It uses only a small amount of electricity in stand-by mode. Home Power contributors periodically test different inverters and PV-related equipment. 44-45, December 1998. This brief was updated in October 2000.