These are exactly the same concerns I've been dealing with as well and as discussed
in this thread. Progressive unfortunately hasn't exactly been forthcoming with clear answers to my questions so I'm now in discussion with
Mike Sokol, author of the No Shock Zone to try to clarify just what all this means. Frankly, with the amount of interest in surge protection and EMS growing I'm surprised that more haven't also questioned Progressive more aggressively and seem to be willing to simply plug in under the assumption all is well, regardless of just which power source they're using. :h
Removing a portable EMS from the circuit when using a genset or inverter as source power is the easiest and most obvious solution to avoiding any damage to the EMS. However, one can likewise easily install a hard wire unit so it too is quickly and easily removed from the system by installing it with 30 amp connectors. Some prefer 30 amp twist lock,
I used standard 30 amp RV connectors simply because i had a few on hand in my workshop. I can have my Progressive EMS-HW30C disconnected in seconds, just as I could a portable unit, but with the additional features offered only with the hard wire version. :B
