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So, why do I use 10 ga extension cords? Because i can't find anyone who makes 8 ga ones and sells them locally! This is a re-hash of the AC/DC argument of over a century ago. DC voltage is heavily dependent on wire size, AC not nearly as much. New 12 volt car batteries should read about 13.5...

That sounds like low voltage, no load should be closer to 27 volts and that compressor should only drop it down to 24.5-25 volts on startup. If it's a new unit from Dometic, contact them! I have a small (CC40) unit and so far no problems.

Check your voltage when it tries to start. The compressor starting draw is high and I think the Dometic supplied 12/24 V cable is a bit flimsy (IMHO) at 16 ga wire. The fuse in that cable is rated at 8 amps for 12 volts or 96 watts, the higher the voltage of the batteries , the lower the...