Just out of curiosity,, does it do or could it do any harm if you run the on board Genny while connected to an EHU... ? I leave my RV hooked up to the mains mainly because when it is damp and chilly I leave a Delongi oil filled radiator on very low. And as with any motorised equipment have always run the motor`s for a few minute`s to keep the cylinders/bores moving parts lubricated. every now and then. Will it do any harm? or should I disconect the EHU ?