Take a look at the power requirements for the heating pad versus what the inverter says it could supply. That's a good place to start.
Radio Shack's Web site lists a 350 watt model as the highest output inverter they sell. Sould be enough to run at least a small heating pad.
Except that when you run it at 350 watts you'll need to supply it with around 30 amps of 12 volt power. Which almost always means pulling a cable directly to the battery. Thankfully most of these use a lot less.
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Sorry for the old bump, but I want to re-visit this. Turns out that the Sports Import model I linked to above (along with another one they sell) is simply crappily made and they fall apart after a month.
Mr. Google offers some options, but most are blankets. Really looking for a decent heating pad (not a blanket) that can be used in the car. ScottC's warning about using a regular heating pad an an inverter has my shying away from that approach given that the fine print that I've seen on many DC-AC inverters suggest that they not be used for things that produce heat.
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Originally Posted by cblaisd
ScottC's warning about using a regular heating pad an an inverter has my shying away from that approach given that the fine print that I've seen on many DC-AC inverters suggest that they not be used for things that produce heat.
Generally, heaters do use a lot of power and are not appropriate for using with a car inverter. However, I am not sure that heating pads fall into that category. My wife has a heating pad she keeps on almost all winter for her birds, I plugged it into my Kill-a-watt meter and at medium, it was drawing less than 50 watts. I did a quick Goggle search and found a couple of references that say heating pads draw 60-65 watts. That shouldn't be a problem with a car inverter.
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