The short answer is yes. Press the button and the inverter will run. When plugged in it will display a green led, meaning 120v passthru. When you disconnect shore power, the Led turns yellow, indicating the inverter is running on battery and supplying power to the fridge. As you have discovered, you can also press the button and power the inverter off when hooked to shore power to get rid of the fan noise
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 Jason & Wendy
2014 F350 Lariat 6.7L PSD
2015 Keystone Montana 3711FL
B&W Patriot 16k fifth wheel hitch
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