inputs.text: quiet thermostaticallycontrolled fan - used several similarsize inverters various applications noisy fan operates continuously wanted try one thermostatically controlled fan fan works advertised tested unit rated 500 watt output initially fan not operate inverter warms fan speed gradually increases speed even full speed fan noticeably quieter two inverters similar size havegood points 1 operate rated output 500 watts 2 quieter similar inverters familiar 3 positive acting onoff switch rather pushonpush buttoni not yet opportunity test continuously heavy load long period timedescription error single power outlet single usb port not dual stated descriptionthe possible negative point single outlet made accommodate several different types plugs standard usa 115 volt 3prong plug fits well enough time tell hold serviceit looks different found usa appliances initial fit plug seehems slightly loose