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Running Laptop off Car battery

post #1 of 15
Thread Starter 
Hey guys I have a question that I need answered, didn't really know where to put this lol.

I recently was hired as an overnight guard at a power plant. My usual shift is from 6pm to 6am. The job requires me to sit in my car all night long which is mind numbing.
I purchased a 200 Watt (continuous) power inverter, 400 Watt peak load. I plan on plugging my laptop into it over night.

My question would be, how long could I leave my laptop plugged in and running without having the car turned on. The laptop is a ASUS G51 gaming laptop and when I looked at the power supply it said, Input: 120V - 2.0A. So I am assuming Amps * Volts = 240 Watts. I have yet to look at the battery of the car but in general how long do you guys think I can leave the laptop running without turning the car on? Or how often should I be turning the car on to recharge the battery? It's in the middle of no where so having the battery die on me and the car not starting would be a huge problem.
post #2 of 15
How many amp-hours is the batterry?
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post #3 of 15
I dunno about your car, but the Toyotas I've had experience with all shut off the DC power output when the car is turned off.
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post #4 of 15
Quote:
Originally Posted by RaCeR123;13734984 
Hey guys I have a question that I need answered, didn't really know where to put this lol.

I recently was hired as an overnight guard at a power plant. My usual shift is from 6pm to 6am. The job requires me to sit in my car all night long which is mind numbing.
I purchased a 200 Watt (continuous) power inverter, 400 Watt peak load. I plan on plugging my laptop into it over night.

My question would be, how long could I leave my laptop plugged in and running without having the car turned on. The laptop is a ASUS G51 gaming laptop and when I looked at the power supply it said, Input: 120V - 2.0A. So I am assuming Amps * Volts = 240 Watts. I have yet to look at the battery of the car but in general how long do you guys think I can leave the laptop running without turning the car on? Or how often should I be turning the car on to recharge the battery? It's in the middle of no where so having the battery die on me and the car not starting would be a huge problem.

Easiest i can think of (which isn't much) buy a load of batteries and keep swapping them?
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post #5 of 15
my optima yellow top would go about 5-7hours without starting my car and that's with acc on and stereo playing... as for shutting off the dc power... you can connect the inverter straight to the battery with an inline fuse... my inverter has it's own power switch... as for how long you can leave the car off without turning it on and charging the battery... would more likely depend on the quality of the battery... a volt meter would be handy... i have an AEM meter for times when i want to watch my voltage... anything below 10v left on the battery and you run the risk of needing a jump start
Edited by 808MP5 - 6/3/11 at 12:48am
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post #6 of 15
Quote:
Originally Posted by kz26;13735283 
I dunno about your car, but the Toyotas I've had experience with all shut off the DC power output when the car is turned off.

If this is true you could always run them parallel to your ignition ie straight off the battery. Probably depends on how much you want to use it.
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post #7 of 15
sounds dangerous and not worth the hassle imo. doesn't ur laptop has it's battery? maybe consider extra laptop batteries instead of using the car. i mean u can use the car for like 2-3 hours but i wouldn't risk myself stranded going longer than that.
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post #8 of 15
I think average car batteries have around 40 amp-hours which means you could draw 2 amps for roughly 20hrs. But then you need to get home aswell frown.gif
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post #9 of 15
Just wondering, should you be gaming on the job?
post #10 of 15
Thread Starter 
Quote:
Originally Posted by mount-eerie;13735271 
How many amp-hours is the batterry?
I don't know, need to check that out when my girlfriend gets back from work with the car.

Quote:
Originally Posted by NuclearSlurpee;13737122 
Just wondering, should you be gaming on the job?
Yeah I am allowed to do whatever really, it's in the middle of nowhere so you can see someone coming from 2 miles away.
Quote:
Originally Posted by mount-eerie;13735394 
I think average car batteries have around 40 amp-hours which means you could draw 2 amps for roughly 20hrs. But then you need to get home aswell frown.gif
Yeah that seems to be the problem, and from what I read online I guess you shouldn't really let the battery drop below 70-80% or else you might damage it frown.gif.
Quote:
Originally Posted by james8;13735357 
sounds dangerous and not worth the hassle imo. doesn't ur laptop has it's battery? maybe consider extra laptop batteries instead of using the car. i mean u can use the car for like 2-3 hours but i wouldn't risk myself stranded going longer than that.
Yeah I was thinking about using it for maybe an hour, turn the car on for 20 minutes and so on. But I don't know if on idle the battery would even be charging
Quote:
Originally Posted by L1eutenant;13735293 
Easiest i can think of (which isn't much) buy a load of batteries and keep swapping them?
Might be the easiest but I am not made out money haha
Edited by RaCeR123 - 6/3/11 at 3:12pm
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