enblethen wrote:
They would have got the amperage of the circuit in which they plugged into.
A standard household circuit would be 15 or 20 amps.
If they attempted to use an adapter and plug into a dryer or range receptacle it would be different. It could be 240 volt and fry various items.
What type of receptacle were they plugging into?
What kind of adapter?
More apt to have blown or bad capacitor then compressor.
The OP wrote that he plugged into "a standard outlet" that is on a 30A circuit. (which is perfectly legal according to code) They ran that way succesfully for a period of time so there's nothing to suggest it's a 240V circuit.
Since the contacts are smaller on a typical recpt. than a NEMA Travel Trailer outlet, the current would likely be somewhat limited resulting in a possible voltage drop.