Originally Posted by jpons
Of course I could use my inverter, but that would be very inefficient since the vacuum wall wart converts the AC into DC anyways. I was wondering about a direct DC to DC adaptation.
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If the vacuum runs on DC internally, you would have to find a work around like a direct connection to the vacuum innards from the coach batteries through a 12 v. receptacle. Perhaps showing my ignorance, doesn't the vacuum motor run on AC requiring an internal converter from the vacuum batteries to the motor? I assume (another possible stroke of ignorance) the other parts of the vacuum run on DC. I may have gotten totally confused by converters and inverters compounding inefficiency as power is changed back and forth from AC to DC to AC, ad infinitum
, until nothing is left but heat. I think I'd better get a broom.