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Well, you CAN run the reefer till it stops and the batteries are dead, then you start from another means.
In practice, most batteries give much longer life if you only discharge them and cycle them to the 50% discharge point, which is roughly 12.1 volts for wet acid batteries. You'll need to run some numbers and/or use a multimeter to see how long you can run your own particular reefer before reaching that point for your own battery setup.
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