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So that inverter is a 150W output model. Assuming it's 90% efficient (that's probably a high guess) that means it takes 167W input. At 12V that is 14A. What's the fuse capacity on your lighter outlet? Most are in the 10-15A range so at 14A you are really close and it makes sense that you will blow the fuse after some time. Fuses are not able to handle ...

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