Long battery life
Submitted: Sunday, May 06, 2007 at 20:03
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tdf
in issue 104 of 4wd monthly on page 120 they do a fridge test and claim that 2 x 6 volt deep cycle 120 amp batteries wired in series ran a fridge for T W E L V E days before the voltage dropped low enough to stop the fridge.
12 x 24 x 1.5 amps equals 432 amps never heard of a fridge running this long with these or any otyer battery set up.
what do others think...?
Reply By: Muddy doe (SA) - Sunday, May 06, 2007 at 20:26
Sunday, May 06, 2007 at 20:26
On the face of it and without having read the article it sounds like complete crock!
Why do these magazines insist on raising peopleas expectations on product performance! No wonder people complain when the get the product home into the real world!
Muddy
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Reply By: D-Jack - Sunday, May 06, 2007 at 20:34
Sunday, May 06, 2007 at 20:34
I could run my fridge for 365 days off my 70 a/hr AGM (cheapy Amptec) provided the temperature was right!
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238276
Follow Up By: PeteS - Sunday, May 06, 2007 at 21:13
Sunday, May 06, 2007 at 21:13
D-Jack.
You nailed it D-Jack.
That's one of the many the important details that make up wht the batteries lasted sooooo loooooooong.
PeteS
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Reply By: Member - Oldplodder (QLD) - Sunday, May 06, 2007 at 20:43
Sunday, May 06, 2007 at 20:43
Wonder how much they weighed?
Was working on 2V telestra batteries setup forexchangs a while ago.
About 4 to the tonne.
16 (32v) powered an exchange for a while.
AnswerID:
238279
Reply By: Member - reggy 2 (VIC) - Sunday, May 06, 2007 at 21:15
Sunday, May 06, 2007 at 21:15
HI TDF
I HAVE A FREIND WHO HAS A MOBILE HOME HE RUNS 4 DEEP CYCLE 6V BATTERYS HE SAID THAT HE CAN GO 10 DAYS WITHOUT CHARGE HE USES A HOUSE FRIDGE RUNS THROUGH A CONVERTOR
REGGY 2
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Reply By: _gmd_pps - Sunday, May 06, 2007 at 21:28
Sunday, May 06, 2007 at 21:28
there is a flaw in your calculation .. the fridge does not draw 1.5A continuously ..
it depends on temp diff to ambient and how often you open as
well as the volume of the fridge ... not impossible but very unlikely under "normal" operating conditions ..
have fun
gmd
AnswerID:
238290
Follow Up By: Muddy doe (SA) - Sunday, May 06, 2007 at 21:35
Sunday, May 06, 2007 at 21:35
I have a smallish fridge - Weaco CF40 -it draws about 4 amps running but runs only about 25% of the time, more of course when it is hotter and less when cooler.
This would be an average of an amp an hour in "normal" conditions (about 25 degrees day and 15 degrees nights). My 115AH Trojan will comfortably run this fridge for 2 maybe 3 days at most before I am starting to require recharging.
Maybe from 100% charge to a battery damaging "flat" and in low tempreture conditions - MAYBE. But I doubt it!
Not having a go at you gmd. I know that you know what you are on about. But it would be a VERY effecient (or small) fridge that can get by on
well under 1 AH in real world conditions.
Cheers
Muddy
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Follow Up By: _gmd_pps - Sunday, May 06, 2007 at 21:46
Sunday, May 06, 2007 at 21:46
I agree with you .. thats why I said unlikely under "normal" conditions ..
have fun
gmd
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Follow Up By: Jimbo 2121 - Monday, May 07, 2007 at 08:24
Monday, May 07, 2007 at 08:24
In the article it mentions a 40 litre Engel.
I have a Waeco CF-40 and as a test I hooked it upto a fully charged 12.5v (in car) N50 bosch starting battery, 2 years old. I set the low voltage cutout to 11.5 volts. The weather was cool, mid teens, and it did rain a fair bit. The fridge was in a transit bag and was never opened, set to 4 degrees half full of beer. It went for 60 hours before it cut out on low voltage. The battery tested 11.8v after it cut out and only just managed to start the car. So now I know that in favourable conditions the longest I could expect it to run for would be 1 or 2 days.
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