I've been using the Ensupra meter to monitor power from a MSW inverter from my PV powered emergency backup system.
http://i46.photobucket.com/albums/f1...Solar/z203.jpg
The load on the meter is from the A7 ASHP hot water heater..
It seems to be doing just fine, with a horrible "AC" source that looks a lot like this..
http://i46.photobucket.com/albums/f1...squarewave.jpg
The displayed data is very similar to the normal output I see from the grid.
I'm liking this new meter more every day!