DC 12V to AC120V Pure sine Wave Power Inverter 300W with Dual sockets Output and DC 5V 2Amp USB Output. Ideal for Most Small Power appliances. (300W) Blue

This unit was purchased to nun non-stop at about 1/3 capacity, with periodic jumps to 150 Watts. It was also able to self-start when battery voltage was removed and then restored. I have temporarily removed it from service for inspection after an 11-month run. It will be returned to service in a few days. The AC output is still very close to 120 Volts and 60 Hz, and the sine wave output looked good when I checked it with an oscilloscope. Its operating environment was conditioned to 85 degrees F during the summer. Winter temperatures could fall to near freezing. The enclosure becomes slightly warn when powering a 65-Watt load, so efficiency is good. It has provided power to several computers and two VHF and UHF transmitter/receiver devices. Impressive performance for such an inexpensive AC inverter.

I’m using this inverter in my truck mainly to charge my drone batteries, and it has worked perfectly so far. I wired it directly to the vehicle battery using 8-gauge wire and it delivers stable power without cutting out. It had a slight “electrical/plastic” smell the first couple uses, but that went away quickly. Charging pulls a good amount of power, so I definitely recommend using it with the engine running because it can drain a battery fast if the vehicle is off. Once it’s powered, it runs cool, indicator lights are easy to read, and the outlets feel solid and secure. Overall, great inverter for vehicle use and it does exactly what I needed.

All of these kinds of inverters need a VERY good HIGH current connection to your battery. If your wires are too long or not a heavy enough gauge, then you end up with too much of a voltage drop in the wires and it's impossible for any inverter to supply the rated power. It will work for light loads, but then the demand gets higher, it will read the voltage drop as an under-voltage input as it should and shut down. You are taking 12 Volts and stepping it up to 120 Volts, and power is power, so if you only have 12 Volts and you want to get 300 Watts, you need 25Amps, and you need the 12 Volts AT THE INVERTER TERMINALS while it's pulling 25 Amps. If it drops down to 10 Volts due to the resistance of the wire, it's not going to work. If you need to supply the surge, then you need heavy enough wire to supply the ENTIRE Surge, This inverter has a surge capacity of 600 Watts, so you need heavy enough wire to supply 50 amps to this and keep the voltage drop down as low as possible, otherwise, when the surge happens, the voltage drop will cause an undervoltage condition. It should be noted that there is NO WAY that the included cigarette lighter cord could have a chance of supplying 50 Amps to this!! I wanted this in the back of my truck and use the auxiliary connection back there to run it, then feed the 120V back up into the cab. The auxiliary connector is fused at 50Amps, so I thought that would be sufficient, and while it could provide 50Amps, the gauge of wire built into the truck was not heavy enough to supply the power needed to end up with 12V at the inverter terminals while supplying the surge. I wanted to use this to run an ice machine in my truck, which needed 500 Watts for about 2 seconds to start the compressor, then 100 Watts while the compressor was running. So even though I was on a circuit rated at 50Amps, I could not keep the voltage at the inverter high enough during the start surge. I did not feel like running new wires, so what I did was put another battery in the back, and hooked up the inverter to that using the wires it came with (not the cigarette lighter plug, that is useless). With short wires connected to the battery it was able to start and run the compressor with no problems. Since it's only the starting surge that really needs the battery, I was then able to use my original connection to keep the other battery charged. This second battery ends up being nice because not only does it supply the start surge, but it allows me to run the inverter when the engine is not running without risk of draining the battery so much, I can't start the vehicle. Unfortunately, this unit was giving me a warning beep while my compressor was running, so I thought I better go to the next size up, which has a capacity of 600 Watts and as 1200Watt surge, and it didn't cost that much more. That one came with heavier cables, I bet if I put the heavier cables on this one, it would have been fine. Edit: I was reading other reviews about this and some claim this is not a sine wave inverter, so I thought I don't want to give a 4 star review if this advertised as Pure Sine Wave and it is not, SO I went to verify this claim on my own, since I am an electronics engineer with a bachelor's degree and over 3 decades of experience, and of course I have many oscilloscopes, I am more than qualified to make this test. So I used a soldering iron as a load, since it is mostly a resistive load, and hooked up the test, using a fully charged battery and connecting only the battery to the inverter, and then plugging in the soldering iron, and hooking up my x10 probe to the line output, and of course hooking up ground to neutral, which I can do because this is entirely floating as the battery has no connection to ground, and I was astonished then right there on my Oscilloscope screen was an undeniable SINE WAVE!!! It's NOT a modified sine wave at all, it's a pretty good PURE SINE WAVE. It has a few minor glitches in it as you can see in my photo, but for the price, it's pretty darn good, and those glitches can't possibly make any difference at all, especially in anything like a computer that does not directly use the AC anyway, it's all rectified and regulated to DC so the exact shape of the sine wave could not ever make any difference at all, and in fact the sine wave provided by this is CLEANER than the sine wave provided by my utility company! There is a simple way that an oscilloscope can show what looks a square wave... when the input is a sine wave... if you forget to switch the probe to x10 then in fact since you would be then exceeding the voltage capacity of the oscilloscope, you will get some kind of square wave on your display... but there is NO Way to make a scope display a sine wave when there isn't one.

Not sure if a pure sign is necessary for anything I have, but I thought at this price, may as well use this onegot ot for camping runs all my phone, laptop, mini fridge(which I could wire directly to the battery) charges my Ryobi tools and powers my grinder with a diamond blade, the last of which surprises me.it 2 years sibnce owning it now. no signs of wear. ive dropped it countless times.

I purchased this for my camper to run the 110v refrigerator, 3.3 cu ft, while traveling. This inverter is great and works as described, as needed. This will run my refrigerator off of my 12v house battery and be charged by the tow vehicle when hooked up going down the road. It has a low draw on the house battery when not hooked up to the vehicle . I'm very happy with this addition.

Hello I bought and used this inverter for about 6 months until it failed. I used it, put it away, and tried to use it during a power failure. It would not turn on. The fuses check out as good.

I wanted to have something as just one additional line of defense regarding my sump pump system. I have a 2- battery backup system today for if 1) loose power or 2) the main AC pumps fails or cant just keep up - but I wanted something to back up the 12 volt pump should it fail itself to work in a power outtage situation. This fit the bill. I have Basement Watchdog system. The main AC pump is 4.2 amps x 120 volts which equals 504 watts. So I figured add 20% more to get to ~ 600 watts. This invertor says its rated 600 watts and 1200 surge or peak watts so I fugured I would try it to see if it would run the AC sump pump, hoping it would have enough power. In my testing, it WORKED FINE and ran the sump pump, with no issues. The pump probably only needs to run 5-8 seconds to empty the pit. Then it would need to repeat based upon how fast the pit fills. I am hoping this will work to get me by on a stormy night. I am not hooking this up perminately, but will only have stored at the ready next to my system to use if required. Since its a "back up of a back up" I didnt wanted to invest much money in it for for $50 bucks this was the cheapest option I found. I can't speak to the longevity but build quality looks ok and in my test it did the trick so I feel I gained a little more peice of mind.