On average, it is around 15% of energy loss. All power inverters have some percentage inefficiency and power loss when converting 12 volts direct current to 120 volts alternating current. To quickly find out the maximum how long you should expect a car battery to power your TV set, all you need to do is to divide the battery’s ampere-hours (Ah) capacity with TV sets amp draw.įor example, if your battery has a 41Ah capacity and your TV set draws 0.5 amps, it will give you a maximum of 82 hours running time.īut, that is not a full picture. The short answer is that it depends on two things, how much power your TV set draws and what is the capacity of your car battery. However, a battery might be able to provide 500 Amp of current at a voltage of 8 to 10 volts during this starting phase.Ī Standard car battery has 60 AH capacity and 12 Volt so its power capacity is around 720 Watt – hours.
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