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True sine wave means that sensitive electronic devices are ok to run on this. The unit is rated to provide 300 watts for 1 hour. If your TV is rated for 20 watts, the unit fully powered should p run the tv for up to 15 hours. Cold temps could cause the tv to draw more amps and affect the output of the device. In all cases, whether any power supply can run a device and for how long depends on the wattage rating of the device vs the rating of the power supply.
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