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12v car battery how long i can use

ubasan
By ubasan
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Ive hooked up a small fan (160mm i think)in a new 12v car battery. Just want to ask how i can use it before the charge drains out. I still dont have any chargers so im thinking how long it will last.

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Depends on the current draw of the fan and the capacity of the battery....

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Depends on the current draw of the fan and the capacity of the battery....

This is a new battery just bought yesterday. For the watts of the fan, no idea though. Just a simple small fan Hooked up on the batt

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Depends on the battery. But generally a long time.

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This is a new battery just bought yesterday. For the watts of the fan, no idea though. Just a simple small fan Hooked up on the batt

Well a new car battery can be anywhere from like 60 amps to over 100 amps, which is a huge difference. If you want an accurate answer you need to tell the capacity rating of the battery.

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Won't the huge amount of current that a car battery outputs not just fry the fan motor and make the wires glow and burn away the insulation? They're only designed for currents you can measure in mA.

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Won't the huge amount of current that a car battery outputs not just fry the fan motor and make the wires glow and burn away the insulation? They're only designed for currents you can measure in mA.

Not if you have a resistor. 

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...why r u powering a fan with a car battery?

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...why r u powering a fan with a car battery?

Im using it for power outs and stuffs like that.

160mm fan ?, probably like a 5 days before the battery is out.

Is this non stop?

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Im using it for power outs and stuffs like that.

theres probly something better than a car battery that you can use for that kind of stuff.

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Won't the huge amount of current that a car battery outputs not just fry the fan motor and make the wires glow and burn away the insulation? They're only designed for currents you can measure in mA.

An electrical circuit only takes the current it needs. High voltage can fry something, but if the voltage is within spec you won't have any problems. No resistor necesssary.

 

 

theres probly something better than a car battery that you can use for that kind of stuff.

Depends on the situation, batteries are expensive but the take a lot less maintenance than a generator.

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Depends on the situation, batteries are expensive but the take a lot less maintenance than a generator.

ture dat

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Is this non stop?

 

if the fan is a normal one then yes around that. might be more might be less since there is a differences between the manufactures

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Check your battery, it should state a capacity in ampère-hours (Ah). Your fan should state a current draw on its motor hub (something like 0.02A usually). Is you take the capacity and divide it by the current draw, you get the hours your device will be able to run.

 

Keep in mind, though, that most car batteres need to be charged before use when they're bought new. The factory doesn't charge them fully afaik.

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the avrage car battery is about 60 to 75 ah so and the most pawer hungry fan i know of draws 0,5 amps soo

75ah/0,5a=150h so 6 and a half days or more

Won't the huge amount of current that a car battery outputs not just fry the fan motor and make the wires glow and burn away the insulation? They're only designed for currents you can measure in mA.

it will only fry it if the voltage is higher than 12 volts an it isn´t so if the fan is rated 0.5 amps it's all the battery will output

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Won't the huge amount of current that a car battery outputs not just fry the fan motor and make the wires glow and burn away the insulation? They're only designed for currents you can measure in mA.

no it wont ... the fan only draws how much it needs ...

Not if you have a resistor.

even without a resistor the fan wont burn up as the fan presents the correct resistance already for operation with a 12v source

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Are you sure its 12v? normal car batteries run at 14 volts.

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Won't the huge amount of current that a car battery outputs not just fry the fan motor and make the wires glow and burn away the insulation? They're only designed for currents you can measure in mA.

if you dead short the battery that will happen. as long as you have something dissipating the energy then you are fine. For a fan, instead of turning the energy into heat you turn it into mechanical energy. Basic physics

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