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Easiest thing to do would be to work out your average current draw on the 12VDC side, inflate that by a safety margin (Say 50% for the sake of the argument) and ask how many amp hours you can expect at that discharge rate.
To rough some figures. Say your average current draw is 6A, add 50% and round it up to 10A and ask him how many amp hours the individual batteries are good for at a 10A discharge rate.
They will talk about a C rate, which is the discharge current at which the battery will provide the rated amp hours. If for instance the C rate was 10A then they would be 420AH at 10A. If C was 5A they will be somewhat less than 420AH at 10A discharge current (2C)
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