The 8000W Low Frequency inverter I bought from eBay has not performed as I wished.  It beeps in overload mode when it approaches its advertised capacity of 8000W but its max capacity is well over that (3200W) so I don't understand why it beeps.  I also had issues with a blowing AC fuse, but that was mainly because I had the N wire connected to the output side with the two L1 and L2 wires for the 220V.  The inverter is used to power a water pump that is a 240V 60Hz and perhaps 1200W or more.  It does run fine for a long time when the pump has a reservoir tank that it keeps full.  The pump has a system that keeps water pressure in the house at a certain level so that there is always water available when a fosset or spigot is opened.  This feature has the system turn the pump on often, as often as every 5 minutes or so.  This quite a heavy load on the system and I did not expect it to require such big solar power system to maintain.  A better alternative is going with a much more efficient pump to begin with.