Rick,

Someone is feeding you something you don't want to eat. For sure, current draw drops when voltage increases. That's why some high current appliances operate on 240V rather than 120V. BTW, some converters only use 120V appliances.

The power company standard for voltage delivery to your house is 114V to 126V. Above or below that, they should be adjusting the tap that services you. The National Electrical Manufactures Association recommends manufactures to design and build to +/- 10% of their nameplate voltage. Many manufactures use 115V for their nameplate voltage meaning they are designed to operate at 103.5 to 126.5V.



Anyway you look at it, your 138V is well out of the accepted standard for commercial power delivery. The factory default high voltage cutout for the popular Trace 4024 inverter/charger is 132V. The Hughes Autoformer is not advertised to boost voltage until the incoming voltage drops to 113V and then it is said to boost 10%. It should not be doing anything at 138V.

Here's a voltage reference document from PG&E, (CLICK HERE)