In reference to
myredracer's post my bet is most folks don't realize just how often park campsite power is in fact problematic, either because the system is being excessively loaded down from heavy use and isn't capable of producing a nominal source voltage of 120 vac or because of surges & spikes in the power system feeding the park system, or even because a given campsite power post has been mis-wired by the same park handyman who also cleans the washrooms. :E We typically will experience 3 or 4 events each season for one reason or another,
this being an example when incoming park voltage dropped significantly, was out for several hours, but as can be seen on my EMS monitor panel was still in error when power did come back on but the EMS prevented it from getting to our camper until the fault was corrected. Error PE2 means "open ground" which is not good. :D It still amazes me that so many will drop $20K, $30K, $40K, and more on a new rig but balk at investing a few hundred in an EMS that can go a long way toward protecting that rig's electronics which themselves can cost thousands $$$$ to replace. Go figure. :h