BESTEK 500W Pure Sine Wave Power Inverter DC 12V to AC(2 Outlets) 110V Car Charger Plug Inverter Adapter Converter with 4.2A Dual USB Charging Ports, ETL Listed

Took it camping to inflate a large mattress and it worked perfectly. No hesitation and the motor ran at full speed with no extra humming or noises you'd get on a modified sine wave inverter. There's a photo attached hooked up to the car battery to do this job. This load is about 190 watts, with whatever spike that happens when the motor starts up.When it first arrived, I tested it with an oscilloscope because I was skeptical of the "pure sine wave" claim on an inverter at this price point. There's two photos attached- the one that looks perfect is this inverter running an LED 110v lamp. The one that looks a little rough around the peaks/valleys is from a 4000W inverter meant to run a house off the grid (costs several thousand dollars)- but it's running an air conditioner, refrigerator, and all the other junk people plug in at home. Still, it goes to show that this little inverter makes a really nice sine wave. This is good because many types of electrical devices don't function well (or they make weird humming noises) with a poorly shaped sine wave (or a square wave like the cheaper ones make).Other tests I tried:- Charging my Macbook worked fine with normal power plug- Connected it to a 50 watt power source to see what it does under overload. When you try to draw more power than your source can supply, it resets until you turn it off and on again then it happily tries again. This is nice because if you run it from a weak battery it won't sit there trying to make 110v and failing miserably, possibly damaging whatever you're trying to run.- Used USB port to charge the Macbook as it can accept power from a normal USB source (obviously it'll charge a lot slower because there's less power available, but still it gets some juice). Worked fine.- Charged a phone from USB, worked fineI read the bad reviews before I bought this inverter. Some of the bad reviews maybe they got a defective unit, but others are almost certainly from improper use (especially the blown fuse ones). Some things to watch out for:- The cigarette lighter or power port on your car will NOT supply 500 watts, I guarantee it unless you've got an electric car or something and even then probably not. My truck has a 20 amp fuse on that circuit and the car in the photo attached has a 15 amp fuse. At 12 volts, that means they can supply 240/180 watts respectively. And that's at the point the fuse blows, not the point you can safely draw power- the car port says "125 watts max" when its fuse blows at 180. So the people mad because this inverter "doesn't work in my car" or "blew a fuse in my car" were simply trying to draw more power from the inverter than the fuse in their car would allow.- Note in the photo above that I connected directly to the battery. If I had plugged this into the 15 amp power port inside the car with the cigarette lighter adapter, it most likely would have blown the fuse.- The power adapter on my laptop says 140 watts, so even plugging that into the inverter using the car's power port *might* blow the fuse if there's a spike on startup. You REALLY need to look at what you're plugging into this thing if you're using it inside the car and see how many watts it uses- then pad that for safety and because the inverter is not 100% efficient at converting DC watts from your battery to AC watts that it outputs.- Like any electronic device, solder joints can break if you drop it so be careful with it. Treat it like a laptop or something else you don't want broken. Broken solder joints will result in intermittent failure or complete failure. Maybe keep it in the box when you're not using it.Things I haven't tried:- drawing a 500W load to see if it really is 500W. I can only verify it supplies about 200W well.- checking how much power it draws when off with no load, or on with no load. I'd like to get around to this because would be nice to know if it needs to be unplugged when not in use.

Power inverters aren't anything new, I still have a 100W unit I bought from Radio Shack over 30 years ago. But even with the affordable power stations available today, inverters are still popular and with a few additional parts, allow the project-person to build their own power station for much less money.On a whim, I decided to try my hand at building my own power station, which includes s 27 series battery box, a 24DP battery that has about 50AH, a 50 watt solar panel, some cables, an inexpensive PWM charge controller, and this BESTEK unit.So far this is working well. The BESTEK is fused, and has convenient, easy to manage, large plastic nuts that allow you to fasten the cables to the battery. It is amazingly light, and relatively quiet. All inverters and power stations make a little noise due the their built-in cooling fans.500 Watts isn't a lot; you aren't going to power a microwave, a/c or heaters. But you can charge batteries, run a few power tools, and several LED lights. So with a build like mine, you could easily add security lights to a barn or shed.Building your own power station with inverters like the BESTEK also gives you the advantage of putting the inverter where you want it without occupying the full space of an all-in-one power station. So if you're adding solar to an old tear-drop or DIY camper, something like this might be a more convenient addition. In addition to a reduced cost, a DIY system with inverters like the BESTEK lets you replace individual elements.The BESTEK unit appears to be well made and nicely finished, no rough edges. Plugs fit securely, and so far I haven't noticed the unit getting very hot.The cable with the cigarette lighter adapter is nice to have, so if you just need a modest amount of 110 volts while traveling or camping, you don't need anything else, just plug it in to your 12V socket and you can charge a laptop. Depending on how long you need it or how big (AH) your battery is, you may want to leave the engine running.If you're just beginning with your DIY power station, remember the rule of them that you need a battery that's about 10% of the AH (amp hours) of the watts of the inverter you plan to use (I.E. a 1000 watt inverter needs a 100 AH battery.) So in my case, my 50 AH battery is perfect for this BESTEK unity. BESTEK has inverters up to 2000 watts, but for those you'd need a 200 AH battery to utilize that much energy.I like this BESTEK unit, and am enjoying my build. I will likely buy a higher watt unit in the future!

Excellent so far. Nice clean sine wave on my Rigol Oscilloscope at 115V no load. Runs everything I have hooked up to it, but nothing over 200W yet.Would like to address some concerns I saw posted from other users:1) A circuit checker shows open ground. I believe this is true for virtually all generators and power converters. If it is a problem for a device you are trying to power, you need one of these plugged into the other outlet. https://www.amazon.com/Southwire-Company-LLC-44400-Generator/dp/B07F4R7BDL2) Measured a voltage between ground and neutral. This sounds like a defective unit. I get zero volts neutral to ground, as you should.

This power inverter has been a lifesaver for running our pellet stove off a 12V battery. It delivers clean, consistent power without any issues, and the pure sine wave output ensures the stove operates smoothly. Setup was straightforward, and it’s been incredibly reliable during use.If you're looking for a dependable inverter to keep essential appliances running, this one is a great pick. It's been a solid addition to our backup setup – definitely a worthwhile investment! I want to comment that it does feel a little cheap in the hand though but it's expected for the price.