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Location: Arlington, VA
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The Adler Barbour Cold Machine is a VERY reliable machine....one of the most reliable pieces of equipment on a boat.
If you're getting a low voltage indication, you need to find out why. First, check the voltage at the batteries, using a good digital multimeter. As SD said, a fully charged battery should read 12.6-12.7 volts. With the 6A load on it occasioned by the A-B compressor, you might see 12.5 or so for the first couple of hours.
Then, check the voltage at the frig, if you can.
Depending on the quality of insulation in your refrigerator, and the ambient temperature around the compressor, you'll find the unit will draw somewhere between about 50AH and 80AH over a 24-hour period.
Only about 50% of the rated capacity of deep cycle batteries should be used on a routine basis. Thus if you have 260AH total, only about 130AH should be used, drawing your batteries down to 50% charge or about 12.2 volts.
IMO, 260AH is really not enough to run electric refrigeration...certainly not for very long. And, presumably, there are other drains on the batteries as well -- lights, stereo, navigation equipment, computer, etc.