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Thread: battery or fridge

  1. 3rd October 2010, 10:23 AM #1
    lewy
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    battery or fridge

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    I have a bushman fridge about 8 months old with duel battery system controlled by drive safes sc 40,the fridge is connected to a bosch 75d31r, 75 A.H,630 CCA starting battery also 8 months old.the fridge won't kick in unless the engine is going or the fridge is on house power.I can hear the fridge trying to start however nothing happens,the battery never drops below 12 volts even when left unhooked for a couple of weeks.have also jump started other vehicles of this battery so battery sen to have enough guts,any ideas
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  2. 3rd October 2010, 10:32 AM #2
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    Pedro_The_Swift
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    hmm thats a tricky one,,
    edit;(posted before text appeared)
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  3. 3rd October 2010, 10:47 AM #3
    lewy
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    tried to post pics of multimeter reading,i give up
    fridge draws 2.5 amps when trying to start,
    5 amps when running of alternator[seem a little high but i think it gets less after a while]
    .14 draw when idle[also has voltmeter running off the battery]
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  4. 3rd October 2010, 11:58 AM #4
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    Blknight.aus
    Blknight.aus is online now RoverLord Vendor
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    faulty earths.
    Dave

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  5. 3rd October 2010, 12:05 PM #5
    slug_burner
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    Wiring is too light, possible poor connections.

    Take a set of jump leads run them from the battery to the closest connection point to the fridge, try to bypass as much wiring and control circuits as possible. Basically connect the fridge directly to each battery in turn and see if it runs ok after that.

    I suspect that you have either the control circuit or the fridge itself detecting too low a voltage on start up and isolating the batteries from the fridge somehow.
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  6. 3rd October 2010, 12:09 PM #6
    lewy
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    both pos and neg wires run right to aux battery,will try an earth from merit pg to earth in back of vehicle
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  7. 3rd October 2010, 01:44 PM #7
    lewy
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    cleaned every connection i could find,made another temp powerlead out of an old 15 amp extension lead ran from every battery i could find,still same problem works perfect on house power or when engine is running just not on battery,is it possible the electronics are telling it the voltage is to low to kick in?? probably have to see Mr bushman tomorrow
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  8. 3rd October 2010, 02:46 PM #8
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    drivesafe
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    Hi Lewy, try getting a voltage reading at or as close to the fridge, and at the auxiliary battery, both while the motor is running and with the motor stopped.

    This will give you an idea of what sort of voltage drop is in the circuit, as I sounds like, as posted above, that you are getting too much voltage drop.

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  9. 3rd October 2010, 03:06 PM #9
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    Chucaro
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    Sounds to me that it is the plug.
    The standard 12DCv plugs are not good.
    Test it with a good firm connection.
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  10. 3rd October 2010, 03:42 PM #10
    Hoges
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    Have same fridge, same problem arose on recent trip. I had previously been running it via the 10amp 12V feed I found in the rear LHS compartment of the P38 (Bosch upgrade) via a Hella (Merrit) plug. Worked very well

    Then I fitted the SC80. ... fridge wouldn't start, even at 12.7V ...just kept "revving". Tried plugging in a 150W pure sine wave inverter and running it from that to take account voltage...no go ...inverter just squealed.
    SC80 however kept all batteries in top nick.

    I made up a 4 metre 8 gauge "lead" and temporarily powered the fridge which was in the rear of the P38 directly from the 200amphr campertrailer battery bank ...all OK and got us home.

    Blknight.aus is on the money...it's the earth points... I phoned the bushman mob and the bloke seemed quite knowledgeable...and he was!! On his advice, I back probed the wires: when the fridge was connected the unloaded 12.7V reading dropped to about 10.something V ....so I experimented and ran an additional (10gauge) earth direct to the cranking battery and tried again...success.

    I must say that the Bushman totally surprised me up on Cape York ...was very efficient...I had added the collar and high profile lid to boost its capacity from 35L up to 52 L for the trip.

    Seriously thinking of tapping into the system and putting 4W laptop fan in the bottom of the fridge to improve air circulation and make it even more efficient...


    EDIT forgot to mention: the quite long 12V lead which comes with the fridge is only about 12g. I believe this is part of the problem also. I intend to cut off the 'cigar' plug end, shorten cable to about 100mm, crimp 8g twin cable (2m) with an Anderson plug on other end. Put Anderson plug also on Bushman power supply cable ini place of the "cigar' socket. I have also made up a couple of "converter" short leads (200mm) with 10g wire to enable Anderson plugs to access Merrit sockets.
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