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The power of your compressor is given by P = V x I = 12 x 30 = 360 W. This sounds about right. It sounds as though your compressor is badly made and that the pressure switch is not adequate for the job. You could try to modify like this. Figure 1. Relay control of compressor motor. Rewire the unit as shown. Use a 12 V relay rated for > 40 A. Your ...

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