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.

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!

Works, cheap. Does what I need it to do camping but the fan runs without a load. Partly the noise but how much of a battery drain does this cause? I get up for a late pee break so I can turn it off. Otherwise it has to be inside the tent. Not a deal breaker at that price. I have no idea if it's truly pure sine wave.

I have been extremely happy with the quality and performance of multiple Bestek inverters I've purchased. They run cool, perform great and have exceeded my expectations. I highly recommend Bestek inverters as a more afforadable option to other name brands without sacraficing quality or function. In addition, Bestek has top notch customer service and actually cares about after sales support. They are very responsive by email with support questions being answered in hours not days or weeks. If you like to tinker with solar projects and you're on a budget, like me, but still want a quality product that is well supported at very competetive price, give Bestek a try. You'll appreciate the experience, value and support. I wish more companies were like this.

Sat on the shelf for multiple years and immediately did 4 days of 80-90% max power during a power outage. Never even really got hot or batted and eye. The sine wave looked good on the oscilloscope too. In fact, we routed a few battery backups through it because it cleaned up the generator power enough to stop tripping them.

I have a small upright freezer that I wanted to be able to run from a 200ah 12v lifepo4 battery for when the power goes out. It draws less than an amp at 120v once the compressor spins up but the inrush current makes it so most smaller inverters can't run it. I didn't want/need a giant 1-2kW inverter since the idle draw would average almost as much as the freezer. This inverter also struggles to run it from the included clamp cables, when the freezer compressor kicks in it does work most of the time but since the freezer powers on 20-30 times per day, it usually fails within a day and requires babysitting. When the overcurrent or under voltage protection or whatever kicks in on this inverter, the light just blinks red and the power has to be cycled in order for it to work again. I made some short 6AWG cables about a foot long with ring terminals going directly from the battery terminals to the inverter inputs, and now it works very reliably. It runs for days until the battery runs out like i want. Idle consumption seems low and efficiency seems good, haven't measured but it never gets hot. Satisfied with this purchase. Edit 2025-12-20: I have used it while car camping and a couple small power outages the last year and still works great. Found out it runs a small WTJMOV brand 0.6 liter 600w kettle long enough to boil a full pot of cold water and click off on its own without tripping any of the inverter protection circuits. Draws 620w when running from the wall but 535w when running from the inverter, boils 600ml to make 2 cups of tea or a bowl of ramen in 7 minutes.

Having done some testing with this inverter and using it off and on, it does pretty well. AC output voltage stays at reasonable levels (above 112 Volts at very high loads) and the sign wave stays smooth the entire time regardless of the load. I even hooked up a 730 watt load to it for a short period of time and the sign wave stayed clean and the voltage regulated itself to stay above 111 or so with a 12.3 Volt input. (14+ Volt input would likely yield better results). I would NOT RECOMMEND overloading this! For testing purposes it did well for a very short period of time though the fan sped up a lot. Likely it would’ve overheated at that 730 watt load, more or less that test is just to show your load can exceed that maximum capacity for a very short period of time and this will not have any issues. (Aka if you’re powering a large fan that has a startup surge of power or similar devices.) Running at rated power though and it will do fine. As with any device I wouldn’t recommend running above 80% capacity however, just as a general safety rule. I like that this product is as advertised with a pure sign wave and a very strong output voltage. (While lower than typical residential electrical levels it is still acceptable). At Lower loads it’ll hold 116-117 Volts just fine.

I have a 100 series land cruiser that I use primarily for camping/offroading/long trips. I had a cheaper 500w inverter for years that was fine for occasional use, but I wanted something that I could install permanently that would run whatever I hooked up to it as well as recharge my Ecoflow battery from the alternator at a higher rate than I could get from a 12v socket. I tried my older inverter, but the Ecoflow wouldn't charge from it because it was a modified sine-wave style inverter. I purchased this one to rectify that issue and it works perfectly. For thanksgiving week, I took a 9-day camping trip with my 6 year old. This inverter charged the Ecoflow and ran his laptop whenever we were driving without a single issue; never overloaded or switched off or overheated. One thing to be aware of is this one is much larger than a modified-sine-wave style inverter of the same wattage - apparently you need a lot more internal hardware to make that pretty sine wave. Also, my permanent install involved running 8 AWG wire directly from the battery (through a breaker so I could turn off the inverter!) to the inverter under the carpet of the cab. You can't pull 500w through most car 12v outlets - most are rated somewhere around 120-150w - so a direct battery connection is required. If I ever need a larger inverter, I'll be getting a bigger version of this!

I have bought two of these already, and they are great power inverters. I still don't understand why they don't use pure sine inverters in vehicles: every time I have to wire one of these to supply clean current to my electronics. This works great, gives a very clean signal, true 500W at a great price.

Buen Inversor

Had it for 2+ years now, its been in temperature ranging from -40 to 40, still working strong. It is a clean, pure sine wave as well. Fan is a tiny bit loud but tolerable

Great little inverter, But there is no surge capability. it will not start a mini-fridge compressor. The inverter will run steady a 550w with a PERFECT SINE!!! Very impressive. But not 1 watt over 600w ! It will overload protect itself !! In the ad there is no mentions of the surge capability... Minimum voltage 10.08v, re-start at 10.88v Maximum voltage 15.65v, re-start at 14.85v 119v hot to neutral, 62v hot to ground, 50v neutral to ground All Aluminium case, but no mosfet is touching it, it mean it don't get warm. Only the Fan will cool it, and it always run. As like low, medium, high. On resistive load we get At 150w output, 160w input equal 93.75%efficient 237.3w / 253.5w * 100 = 93.6% 430.0w/475.2w*100= 90.5% 550.8w/647.9w*100=85.0% on a small air pump, which is inductive 234.8w/253.8w*100=92.5% Argh !!! It's only 600w surge!! That's crazy !!! Most inverter handle 2x for surge... If not running any mini-compressor type thingy this is a great inverter for this amazing price.

This is my third of these inverters and I am happy to report they work very well. The first two were used in small sleeping guest cabins equipped with solar PV and batter storage. The lighting is 12 vDC (wall, hanging and strip lights) - but the inverter offers guests an easy path to charge their computer devices, inflate an air mattress, run a laptop or connect another light demand load. They work super well for these needs. I also added a remote switch as the inverter and fused connections are in a clear locked box so guests can view - but kids stay safe. They are fused and offer good protection. Inadvertently a person recently connected a small bar fridge - this 'happily' tripped the overload and safely shut down the inverter. (Fridges of course do have inductive loads 3X running demand). No harm - no foul as we simply moved the fridge to another connection and reset the inverter following the manual. So they perform well - are safe and reliable.