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the problem is the heat, if you mount it in the engine compartment, you have to account for the heat from the mosfets in the pwm but also from the engine as well, you are better off using a 300w resistor, that is still what i use today, no mosfets to over heat, no boil over from the cell just a constant current output. After all the pwms i bought and built, the resistor works the best.
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