The original poster said it was at his BIL house. I assume he means his Brother-In-Law's home. Assuming that, he's not going to rewire the house. His choices then, are: A) Plug into a 20 amp outlet using an adapter, just to keep the converter running, B) Disconnect the battery, either by a wired switch, or just disconnecting it the old-fashioned way, at the terminals, or C) reduce his 12 volt load while visiting his "BIL", by evaluating light usage, water pump usage, TV/stereo usage, etc.
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