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  #19  
Old 17-12-2015
anthonygubbin  anthonygubbin is offline
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Drift Dave even if you fat cable you may still find your not delivering 14.2-14.4v at the point where the aux sits. Given that if you don't, your fridge will not run for long enough as the battery will not be getting enough charge. Have you tested the voltage at the battery with the engine running? Being a GC I know SFA but is the alt putting out 14.2v on idle. There are lots of variables when trying to properly set up dual battery system. IMO you really want to do it right the first time; otherwise like me you will end up having to do some things twice, costing you more money.

Regards A
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  #20  
Old 17-12-2015
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Yes, voltage drop is another very important aspect to designing a dual battery system. Again, that's why I would recommend 50mm2 (or AWG 0) cable between your starter and aux batteries. For example, a quick calculation gives a voltage drop of less than .2V over a distance of 7m with current 50amp based on 50mm2. So if your alt produces 14.5V nominal, 14.3V at your aux battery is good charge voltage.

Anything less than 14V will be a waste of time, and you'll never be happy with it.

There is a calculater here;
http://www.calculator.net/voltage-dr...s=80&x=36&y=16
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Old 17-12-2015
anthonygubbin  anthonygubbin is offline
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Driftdave, unfortunately IMHO what you are trying to achieve is just really far less than ideal. The idea of massive cables just for the one time in 3 years you need an easy jump start is not really the way to go. Up to you but your gonna struggle to find breakers that will protect the circuit. I have heard they do exist; 300amp breakers that is but that's all I know. An unprotected circuit could destroy your GC in minutes. I have used other means of fully charging batteries in a boot and even though my old ways were not great I still think they were safer than what you're trying to do. One option is to get a length of 8bs cable and run a 300w inverter, then off that a Projecta Intelli Charge 7amp 240v charger. Even better would be a Redarc and Ctek 10 step up charger. TBH the amount of times you should need a jump it's only five more minutes to pull the battery out and use a set of leads. Up to u though bloke after all it's your Jeep. But I think the title of the thread says it all and TBH there is no dirt cheap way...... The only real dirt cheap way is to buy a proper ice box that can keep ice frozen for 5+ days and forget about 12v fridges......
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  #22  
Old 18-12-2015
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Quote:
Originally Posted by anthonygubbin View Post
The only real dirt cheap way is to buy a proper ice box that can keep ice frozen for 5+ days and forget about 12v fridges......
True, That's what I did: I got a good quality techniice esky, was about $140 from memory for a 60litre, re-useable ice packs with service station ice on top for good measure, job done. Everything stays cold for my 4-5 days camping no probs. The last camping trip I went on I was the only camper without a fridge (my 3 daughters were with me). Of the 4 other families with fridges, 2 had problems and their fridges stopped working and everyone was running around with multimeters, swapping batteries, plugs and adapters and stuff. Me, I went to my esky and got a cold beer.

Anyway, for $350 you're dreaming about running a fridge and keeping a battery charged from your car, at least with a safe and reliable set-up. If you want convenience and the ability to jump start, get the 60 Ah Thumper, install the charge kit yourself that it comes with, jump start your car with it with the jumper leads supplied and you'll be fine.

Also, to answer your earlier question to me about charging the Thumper and running the fridge in your car... you plug the Thumper into the car charge kit and the fridge into the Thumper. As you drive the car charges the Thumper and the Thumper runs the fridge, the fridge won't draw more power than the Thumper gets - Thumper doesn't go flat while you drive.

Then, when you park up and take in the sights, the charge kit automatically cuts power to the Thumper ensuring the start battery is fine and the Thumper keeps running the fridge, hey presto, cold beer stays cold.

Simple, easy, not messy or complicated, DIY-able, portable and for $500 delivered to your door it's a bloody steal. I want one but I have too many children that need all my money for food, clothes and education...

What size fridge do you have in mind BTW or do you already have one?
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Old 18-12-2015
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Quote:
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What size fridge do you have in mind BTW or do you already have one?
40l, I should have re-read your first post before I asked that... disregard.
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  #24  
Old 18-12-2015
timbotrog  timbotrog is offline
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I'm running a Projecta DBC150K with contains everything you need to run a dual battery setup in the rear of your Grand.

To link the batteries together for jump starting in emergency, just push the button on the control box.

Took me all of an hour to wire up the entire system.
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Old 18-12-2015
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Quote:
Originally Posted by Squirejames359 View Post
I want one but I have too many children that need all my money for food, clothes and education...
You forgot laptops, phones, ipads.

I hear u loud and clear, livin the dream.



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  #26  
Old 27-12-2015
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driftdave  driftdave is offline
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Hi All,

Many thanks for your help with this project.
I was fortunate enough to receive some cash for xmas.
So I pulled the pin on a thumper.
http://www.home12volt.com.au/thumper-75-ah.html

Thanks Again for your help,
Dave
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