don't know, if I switch off the AC input surge, I don't see more of less power consumption on the software. The 6 Kwatt is messured with the official grid counter. I also have, on an other location, the axpert 5000 (other oem, but same device). This one only consumes 1,3 Kwatt in 21 days which I think is very acceptable (the grid should be able to take over when it's cloudy -> which hasn't been the case last month), but 6 Kw/day is unacceptable. If they can't fix it with a firmware update I will put a relay between the input. The software isn't that difficult to do something with the RS232 port. I will inform you when I have more information on this subject.