Efficiency for running ARB

HumMichaelHumMichael Registered Users Posts: 26 ✭✭
I have been running my ARB frerzer in my garage using 12v. 
Is 12v mote efficient than running ot off a small 300w inverter?
My head says yes but wanted to hear othet opinions.



  • PhotowhitPhotowhit Solar Expert Posts: 5,592 ✭✭✭✭✭
    Is it  designed to run on either? Maybe post model #.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
  • oil pan 4oil pan 4 Solar Expert Posts: 766 ✭✭✭✭
    edited March 2017 #3
    Remember the inverter is going to draw some power all the time even when everything it is powerng is off. So running the fridge straight off 12v power is probably more efficient.

    Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

    Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

  • Wheelman55Wheelman55 Registered Users Posts: 140 ✭✭✭
    I use an ARB 50qt a lot. It's more efficient if driven off a 12v dc system. The inverter loses energy converting 12v to 120v and then the fridge loses energy converting the 120v back to 12v. 
    Building Off-Grid in Terlingua, TX
    14 CS 370 watt modules. HZLA horizontal tracker. Schneider: XW6048, Mini PDP, MPPT 80-600, SCP. 1 Discover AES 48 volt LiFePO4 battery 130 ah
  • HumMichaelHumMichael Registered Users Posts: 26 ✭✭
    I run my 82 quarts in my suv when we travel to bring back groceries we can not find in out area.
    It runs off cigarett plug just fine, but I have since installed a second battery with isolator, just have not ran wires to rear to a distribution point yet.
    It draws just over 1.07Amp/hr which is pretty amazing as it will bring the whole content to freeze.

    I guess it must be DC priority system? If then it must contain a component to convert 120AC to 12DC.
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