Anyone run a fridge on a standard car battery?

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Anyone run a fridge on a standard car battery?

Postby garbage » Sat May 26, 2007 11:14 pm

If so, how long did it last? And what kind of car do you drive?
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Postby Komodo@home » Mon May 28, 2007 12:18 am

Freind of mine borrowed my WEACO CF-80. Said they didnt get much more than a couple of house before needing to restart the car to stop the emergancey low voltage warning coming on.

Basically you have to work out how much power (Watts) your fridge will use over a period of time.

My Waeco is rated at 7.5A but over a 24 hour period uses roughly 40AH of reserve charge - thus I need 80AH per day withough starting. Most car batteries are about 35-50AH...

Car batteries have thinner plates and are more suseptable to permaenet damage from a deep cycle discharge from being used for lighting or a fridge.

Can it be done? Yes
Would I advise it? Definately NOT

Whats your reasoning for wanting to use it of a std car battery?
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Postby garbage » Mon May 28, 2007 12:31 pm

The reason I'm asking is that my car is unlikely to have the room for a second deep cycle battery (under the bonnet), so if I were to have a second battery, it would have to be carried in an already crowded luggage area. I'm wondering if I can get by on running it off the main battery as we tend to stay at powered sites more often than not.

In terms of the fridge, I've narrowed it down to either a Sidewinder or a Bushman due to their low current draw (both use the same GD30 FDC ACC compressor). There's a test they've published where the fridge has averaged 1.35 amps per hour.

http://www.sidewinder.com.au/page125a.html
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Postby Komodo » Mon May 28, 2007 1:02 pm

sounds good.

Prehaps replace your std battery with a LARGE deep cycle with a reasonable CCA rating?

What car? im sure theres a way :P

Should see what car audio guys do to get a battery under the bonnet :P (certain competition classes require the battery stay under the bonnet)
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Postby Ozzycamperboy » Mon May 28, 2007 1:12 pm

see if you can fit a BIG battery under your bonnet instead of your current one. My Battery lasted over 24hrs with my fridge running flat out and still started the car the next night, but its a big jigga :lol: My fridge draws up to 4A/H
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Postby garbage » Mon May 28, 2007 1:24 pm

My car is an 06 Subaru Liberty wagon :)
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Postby Komodo » Mon May 28, 2007 4:28 pm

Not familiar with the '06 suby but i know the earlier ones had limited space in the engine bay (and i can only assume there is less now) but there was room. But I do remember the battery was tiny (boxer motors obviously dont require a great deal of starter motor torque) like 33 AH at best!...
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Lancer

Postby Hissy » Tue May 29, 2007 1:44 pm

I used to have a lancer wagon as a company car.
This little car had no space in the engine bay for another battery.
So i fitted it externally behind and under the rear right hand wheel in the bumper bar. There was enough space to fit a 100amp Panasonic Gel cell battery.
I made a rough mount that bolted to the floor of the boot.

In our present Falcon wagon when travelling to a camp site or just going for a big picnic day. I fit a 40amp battery in the area beside the spare wheel.

Have a look in the boot area. You may need to pull some panels apart to find the space. Gel cells can be mounted anyway and they will not leak.

Good luck
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Postby garbage » Tue May 29, 2007 2:45 pm

Thanks Hissy - as I'm not mechanically oriented, do you know of a place that would specialise in this sort of stuff?
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Postby Komodo » Tue May 29, 2007 3:02 pm

battery world

Or try a specialist car audio installer. They deal with this type of thing ALL the time
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Postby garbage » Tue May 29, 2007 3:26 pm

OK, stupid question for the day:

More A/H = bigger battery. Yes?
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Postby Komodo » Tue May 29, 2007 3:34 pm

more AH = more reserve charge (or RC)

generally speaking yes more RC = physically larger battery there are some (very few and expencive exceptions to the rule)
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Postby garbage » Tue May 29, 2007 3:43 pm

OK, next stupid question. What's reserve charge? I googled it but am still scratching my head.
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Postby Komodo » Tue May 29, 2007 6:04 pm

LOL sorry I've probably confused you.

AH = Amp Hours

Amp hours is the unit of measure used for measuring Reserve Charge (RC)

Similar to using Kilograms as a unit of measure for weight

Thus AH is RC.

Sorry for causing confusion
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Postby garbage » Tue May 29, 2007 6:15 pm

I think I'm all set to walk into Battery World now and ask half intelligent questions! :D
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