12v compressor fridge goes to “check”

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Help, I recently installed a 12v compressor cooling unit fromJC refrigeration to replace the cooling unit in a Dometic 1292 side by side in our 03 Sun Voyager. Runs and cools great plugged in, off the alternator, and off the generator. However on battery only the power draws down to 10.4 cut off too quickly or if it cools adequately will fail to restart the compressor and goes to “check”. I’ve installed a direct from the battery 10ga wire for both hot and ground to no avail. I’ve even run both 10 ga wires hot to the fridge. It is drawing to spec between 6.8 and 8.9 amps starting at11.8 v and drops as the compressor runs. I have two new 6v golf cart batteries at 108 ah each, should be adequate to power this for a weekend with out solar assistance or the generator? The amperage drop is half an amp, with a .75 volt drop over the 32 ft. run. Any ideas?