I've owned this 4kW inverter for almost a year and like its younger cousin I've owned for two years (2kW 24v) it's become a champion . I have run these inverters at almost full power and sometimes higher and I have encountered no problem. They start beeping when you violate normal limits, but they output their rated pulse power for the allowed time. My 4kW version stays on almost 24/7 and powers most of my house and I have connected a REMOTELF switch to it so I can monitor and control it remotely. It consumes about 50 watts in idle mode without load. I've had no trouble disconnecting sensitive electronics from them, including TVs, routers, computers, smart lights, or any of my IoT devices (smart devices, etc.). As for the more power intensive/surges I've hooked up to these: 900 watt microwave 1400 watt microwave small full size fridge side by side fridge toaster medium toaster oven air fryer 500w and 750w 120v Baseboard heaters 500w, 550w, 1400w air conditioners, large washing machines with a switch) So it doesn't matter what I throw at these inverters as long as it's 120v and you keep it within the limits of what it can handle it ok. I think I put the most stress on my 4kW inverter when it was running a 1400w mobile air conditioner and three 500w air conditioners at the same time (plus low voltage bits like lights etc) and it coped with it with absolutely no problems a few hours. in the hot summer heat. You have to watch out for the device bumps you throw at them, otherwise they might go offline if you load them too fast. It also helps to take care of them so they can take care of you. Mine are in my basement so the temperature doesn't exceed 80 degrees in the summer months. So far I am very impressed and satisfied with my AIMS 2kw and 4kw inverters. I will definitely update this review if anything changes. [Updated September 2020] So I could temporarily "kill" him? I had too many air conditioners running (plus the fridge and, oh yeah, the rest of the house) when I turned on the 14,000 BTU air conditioner, not realizing I was already so busy. He speaks of overvoltages of up to 12,000 watts. but not quite sure about that high number. So I lost power for about 30 seconds. For example the whole house. But then it restarted itself. I have to say that this is the ONLY problem - more like "hiccups" - that I have seen so far. It's been around the clock for so long I can't remember. My AIMS 2kW version still works with no problems even though I've owned it longer than this one. So if this one fails me, it should give me an idea of how long it will last and if it can get a replacement in time.
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