This is my second attempt at reviewing this inverter. Amazon rejected my first review since I included a link to a video review that I listed on a rival service. To go find that review, go to some popular video service and put GoWise PS1007 in the search box.Ok, soapbox off. I was looking for a pure sine wave inverter to use in an off-grid solar installation. I was going to use an older square-wave inverter I had laying around, but the fans and other non-resistive loads I was going to power did not like running on non-sine wave a/c. The fans ran slower and hotter and the other electronics buzzed. Pure sine inverters should not have any of these issues.I was limited in my testing of this device as I only have a 50ah battery. GoWise recommends at least a 100 ah battery for this inverter. SInce I am not planning on regular loads that would exceed more than half of the rated capacity of the PS1007, I knew I could get away with a 50ah battery. For loads at or near the 1000-watt capacity, don't skimp on the battery (or the connection wires).The PS1007 does NOT come with hookup wires. I had a set of 4 AWG cables and used those. I'm not sure why GoWise decided to buck convention and not ship with cables.With my 50ah battery and a set of different loads, I was able to run up to 750 watts load before my battery began to protest. This was pulling about 63 amps from the battery. The output voltage and waveform remained well-controlled, with the wave-form maintaining its sine wave at 60 Hz and voltage only varying a little bit. Unloaded, the output waveform had some slight distortions, but nothing terribly objectionable. The patterned cleaned up under load and looked nice when I was loading in the 200-300 watt range. Even when my battery began to strain, and I was starting to get low input voltage warnings from the inverter, the output frequency, waveform, and voltage remained stable and well-controlled.Under modest loads, the PS107 never got hot, and only after running for extended periods of time do the fans come on for several minutes. Unlike other inverters that run the fans constantly, this one remains silent until cooling is called for. It is a bit loud, but not too loud.From a safety standpoint, the output receptacle is a GFCI. This is probably my one criticism of the device as the GFCI flexes a bit more than I am comfortable with when inserting or removing power cords.Ther is a ground lug for attaching to earth or chassis ground. Nicer still is the a/c output is NOT a floating neutral, unlike cheaper inverters out there on the market. Floating neutral output inverters have voltage present even on the neutral line, so any attached loads do not really have their power switched off when their own power switches turn off the "hot" side.Time will tell how well this inverter survives out in the field. So far, so good.