The simple, and flawed, answer is that a 12V/20AH battery will supply 12*20 = 240 Watts of power for an hour. So if you use 35W, the battery will last 240/35 = 6.8 hours. This is the theoretical answer.Click to see full answer. Keeping this in view, can you run a TV off a 12v battery?Though not designed for deep-cycle applications without the car’s engine running, a typical 450 watt-hour car starting battery should be able to safely power a portable DC 1.5-amp TV/DVD player for about 12 hours or a 31″ flat screen (156-watts) for about 45-60 minutes and still be able to start the car’s engine.Subsequently, question is, how long will a 12 volt battery run a refrigerator? If disconnected from the car, a 12-volt, 50AH equivalent, flooded lead-acid car battery and a properly sized inverter (1,500 watts minimum) can power a fridge for about 11 minutes until 50% drained, and about 21 minutes until the battery is completely discharged. Moreover, how long will a battery run a TV? A 100 amp-hour AGM deep-cycle battery with a power inverter can power a large 150-watt TV for 6.1 hours, a medium 50-watt TV for 20 hours, or a small 20-watt TV for about 56 hours until the battery is fully discharged.Will a 300 watt inverter run a TV?Typical Uses. Most power inverters under 300 watts can be connected to a vehicle’s battery through the DC (cigarette lighter) plug on the dashboard. Inverters normally have one or more standard outlets to power laptops, small-screen TVs, video game players or portable DVD players and other devices.
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