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

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 fine I 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.

This little inverter is perfect for running a laptop, printer, game console or other small device in a vehicle. It will charge all my Milwaukee and DeWalt tool batteries using the fastest chargers. Unfortunately, I needed it to run my solar powered gate opener. It ran the opener fine, but the standby, or "no load" draw was over 7 watts. Times 24 hours, that means it will use about 180 watts per day if I never open my gate. My solar panel makes about that, so this inverter simply wont work for me. There are other inverters that will open my gate (square wave, 300 watt) that draw only 48 watt hours per day.

I have to start the generator on the RV to get it to start even with fully charged batteries. I then shut the generator off and it works fine from then on. If I don't run the generator first it just sits and blinks at you.

I have used this product multiple times in my car. I have not pushed more than 100W running through it, but I have seen no issues so far. It has charged 2 laptops and 2 phones simultaneously in the car. The number one issue I heard people complaining about in their comments was the noise of the fan. I put this thing under the car seat and I don’t even hear it. I have tested this in a 2022 Chevy equinox, a 2003 Jeep Cherokee, and a 2001 VW Jetta. When the engine is off, you can hear a faint fan, but nothing too offensive. When the engine is on and at its lowest idle RPM, you will never hear it or suspect it’s there. The noise is negligible compared to a car engine. Overall this is exactly what I was looking for. If I had a more powerful alternator and a car battery designed for continuous discharging, I would have purchased a higher wattage inverter such as 1200w or 2000w just because I like overkill. But 500w is right around where my alternator tops out, so there’s no point in going above that for me.

Didn't think I needed an inverter in my built-out Promaster, but finally caved after melting my DC laptop charger with some heavy Forza. Now I can buy a blender! -INSTALL: pretty easy, although I cut off the dumb alligator clips (now used to secure bags of chips) and added some waterproof ring connectors to actually ensure a secure connection that wouldn't slip off when I hit a small bump. -NOISE: Installed under my bench seat, which helps lessen the noise. The fan has an important job, however I thought it was slightly louder than expected based on the page's advertising (it's not silent!). -TEMPERATURE: I have only ever noticed this unit get slightly warm after some simultaneous heavy gaming and phone charging (rad). -CONSTRUCTION: Very high quality case / wires (~20ga). -OUTPUT: Great power delivery - the USB ports are always on and charge very fast, my phone does the super-fast charging when used with the wall charger, and it can easily handle using my laptop to drive my X-class Lamborghini Sesto Elemento.