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It depends on a lot of factors, however, a 1500 watt heater should draw 12.5 amps at 120v. If you want to use it for 6 hours, a minimum would be 75.

However that being said, batteries work non linearly, so you need to take into account the scale on which the battery is being measured. It's like a car. your best horsepower is what they use for their rating, however, that's the peak performance of the vehicle at a set number of RPM's, and will make the mpg suffer.

Another factor you may want to consider is that most 120v things which are designed to operate in a home with a 120v receptacle, operate on AC and a battery operates on DC.

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15y ago

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