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!

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.

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.

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 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.

This the third time I purchased one of these inverters. I have 2 for my purposes, and I gave one to my daughter when she was transporting her bearded dragons long distance during the winter. They needed to be kept warm and she was able to plug in heating pads into the inverter and then into the car's 12 volt power outlet. They operate very well. I use mine for emergency / remote power use. That means they get thrown into the back of the truck and bounced around a lot and that hasn't affected them at all. I have a few 35 amp hour UPS batteries that I can put in place to where I need some power and I'll attach these inverters. There's a little bit of fan noise, but only when you start pulling a lot of power. I do suggest connecting directly to the battery with heavy duty cables if you want to pull full power. The alligator clamps, while we'll built, aren't really meant for that amount of current.

The two fuses in mine are 40 amp. They make a point that you do not want to hook something up to it that is more than 150 watts if you're using the cigarette lighter in your car. I decided to be on the safe side and replace the 40 amp fuses with 15 amp fuses. I could even go down to 10 amp if I want to make real sure that I have overload protection on a sensitive piece of equipment that I connect up to it. The math on this is very straightforward. A 12 volt battery times a 15 amp fuse is equal to 180 watts. This will keep you within the range of 150 watts of the car. If you want to go lower than that then you could put in a 10 amp fuse and that would end up triggering if something exceeds roughly 120 watts. The point needs to be made that if you really want to take advantage of the full full power of this then you want to use the clips directly on your car battery or on a 12-volt off-grid battery. In this way whatever you're running up to 500 watts will simply drain the battery down to the low warning cutoff. You can always put the 40 amp fuses back in there. You use the fuses in the same way you would use a circuit breaker in your house. if you want to make sure to really protect your equipment then simply go with a lower fuse whether you're using a cigarette lighter on the car or you're using a separate off-grid battery sitting in your tent or in the corner of your house when the power goes out. This would apply to situations where you're running your computer or a CPAP machine and you want to make sure that there is no overload. And, you can see that by using fuses you can buy a 500 watt inverter like this and simply tone it down to where it's going to act more like a 120 to 180 watt inverter. // The inverter that I would love to buy is the one that would come with a tiny little LED screen that reads the voltage on the battery when an off-grid mode and not connected to the vehicle. I charge my batteries to around 13.5 to 14.4 volts. It would be lovely to have an inverter that automatically reads the voltage of the battery so that I could keep an eye on things and make sure that I'm prepared to recharge the battery when it gets down around 11.5 volts. As it is I purchased a inline DC voltmeter so that I can do that, but it's terribly cumbersome and annoying so I took the thing off. IT IS EQUALLY ANNOYING TO HAVE TO USE MY CLAMP VOLTMETER to determine where my battery is at. I highly recommend this for people that live in apartments and are willing to go out and spend the money to buy a 35 amp hour to 100 amp hour battery for emergency purposes. If you find yourself trapped in a city with no power for a couple of days this inverter will prove to be worth its weight in gold or maybe five times its weight in gold because it's a very light inverter. So if you have this and you have a well charged battery you can be guaranteed that your CPAP equipment may run, you can charge your cell phones, and I'm sure there will be other uses. I highly recommend this one because each AC outlet has its own fuse holder. ___________ I took it out of the box, hooked it up to a 35Ah battery, and attached a coffee heater. It works. I still have some equipment tests to run should I need it for an emergency. My voltmeter at the plugs said 116V ac. Being pure sine wave I am very happy to get this. It will likely prove useful in my car for charging batteries for tools on trips. The 500 watts at a price point of $70 is fine with me. My next test will be the drain on my battery for certain items. My need is mostly emergency when we have NO power and I might want to run some lights. This is not the sort of thing you want for running fridges and microwaves. This is excellent for running particular pieces of medical equipment due to low load requirements. Could be very useful in some foreign countries where you might need to siphon energy off of a car battery.

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

Buen Inversor

I tested all the features and they worked

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 inverter is amazing... does over the rated output continuously without heating up. I was drawing 565W continuously until the batteries exhausted. Outer heatsink casing was still very cold! well designed product. I like the hard on/off switch... way better than an electronic switch. I wish this manufacturer makes a higher wattage inverter JUST LIKE this one. Thank you. UPDATE: Thought this is one of the best, overload protection came on and would not start again, green light blinks and completely dead. Disappointed. Update: Contacted the customer service, they asked me to send a video proof, i did, they sent me a replacement the next day. Customer service was excellent. Will buy from this seller again.