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The Meanwell power supply I have outputs up to 53 amps, and I currently have it set to ~14.0v. It's rated at typically 88% efficient, but I've bypassed its internal rectifier so it might be higher than that. The fan isn't supposed to come on until 35% load (+/- 15%) and for the most part it stays off, even when I'm blasting music. I often hear the fan pulsing when I run my turn signals (following the blink rate), roll down the windows, or have the HVAC system running plus headlights (low watt HIDs). So, if I were to guess, typically I'm drawing less than 20 amps during this drive, possibly less than 10 amps.
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