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in 18 hours, one should use approx 5 amps/hr (for the refrig) with a 50% duty cycle or a total of 45-50 amps. Out of a 200amp bank, thats obviously 25% of capacity which should not reduce the voltage enough to cause the shut-off to activate. You either have bad batteries or a bad connection someplace.
Regardless, the stock alternator will only produce 15-25 amps+/- IF THAT in a half hour period; certainly insufficient to recharge the batteries to any degree resulting in constant under-charge (presuming you do this often) and causing the batteries a premature death.
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