It will get it from the AC Circuit. I wired the outlet with a plug on the end, so that I can switch it between the inverter and shore power. When on shore power, I just move the plug over to the 3 way plug I put on the end of the NOCO inlet. When on battery, I move it back to inverter. This weekend I didn't need it, so in just following the practice of leaving it unplugged , then hooking it to the appropriate source as needed.
As an aside, I just finished a 3+ day trip (arrived Thursday last morning, left Sunday mid morning) with no power and the battery was able to power my ARB fridge and phone charging easily all weekend. Very happy so far.
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