How do you connect a car battery to a fan?

Using a 12-volt Inverter Connect the inverter’s positive input clamp (red) to the positive battery post (+) on the automobile battery. Connect the negative input clamp (black) to the negative battery post (-) on the automobile battery. Turn the fan power switch to OFF. Plug the fan into the power inverter.Click to see full answer. In respect to this, how long will a fan run on a car battery?If disconnected from the vehicle, a car battery should be able to power a desk fan for 4.9 hours, a tower fan for 3.4 hours, a window fan on high for 2.7 hours, a box fan on high speed for 1.7 hours, an oscillating fan for 2 hours, or a USB 3-watt fan for 100-131 hours and still be able to start your car. will a 12v fan kill a car battery? It depends on the load (How much the fan draws from the lighter thing), and the capacity (amount of charge) of your Battery, and the amount of charge your Battery currently has. Then you could plug the Fan into it directly. Your Fan would run Constantly without draining your car’s Battery at all . Besides, how do you run a battery fan? How to Make a Computer Fan Run on Batteries Remove 1/4 inch of insulation from the red and black wires on the computer fan and snap connector using the wire strippers. Twist together the red colored wires from the fan and the snap connector. Plug the soldering iron into an electrical outlet and turn it on. Wrap the soldered wires with electrical tape. How long before car battery dies with radio on?Still all things taken into account, 4 hours to 40 hours. If I could measure the power drawn by the stereo and knew the battery was new and its specification, we could be pretty accurate. Note that interior lamps can run 10 or 15W so would add significantly to the load if you leave the doors open.