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BESTEK

BESTEK 300Watt Pure Sine Wave Power Inverter Car Adapter DC 12V to AC 110V with 4.2A Dual Smart USB Ports

    • Based on 5,283 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, Nov 1
Order within 18 hours and 29 minutes
Available payment plans shown during checkout

Color: Black


Features

  • BESTEK 300W PURE SINE INVERTERS designed for your devices that require careful protection, provide 300W continuous DC to AC power and 700W of peak power featuring 2 AC outlets and 2 USB charging ports, great for Christmas gift, charging string lights, laptop, speakers, camera, nebulizer, game console, kindle, iPad and other
  • Equipped with 2 Smart USB charging ports, which detects your devices automatically to deliver its fastest charge speed up to 2.4 amps per port/4.8 amps max, and you can charge most phones and tablets simultaneously
  • Unique vents and smart fan design make our 300W power inverter easier to dissipate heat, and cigarette lighter plug is easy to plug into a cigarette lighter socket
  • Built-in 40 amps fuse and full protection against overheating, under and over voltage charging, short circuiting, overloads, and overcharging
  • What You Get: 1*BESTEK 300W Pure Sine Power Inverter, 1*User Manual, 18-month warranty and customer service

Brand: BESTEK


Recommended Uses For Product: Vehicle


Power Source: 110v,Corded Electric


Wattage: 300 watts


Model Name: MRZ3011HU


Manufacturer: ‎BESTEK


Brand: ‎BESTEK


Model: ‎MRZ3011HU


Item Weight: ‎1.4 pounds


Product Dimensions: ‎8.1 x 5.3 x 2.6 inches


Item model number: ‎MRZ3011HU


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎MRZ3011HU


Voltage: ‎12 Volts


Wattage: ‎300 watts


Date First Available: September 21, 2018


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Nov 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews

    • Works great. Small quiet, perfect for running the laptop in the car, or charging tool batteries
Color: Black
Liked it so much I bought a second one. Originally used it in the car to charge the laptop while on road trips. Bought a second one for the shed, to charge yard tool batteries from the solar panel.
Reviewed in the United States on October 14, 2024 by Mark Savoca
    • Hobotech Recommended
Color: Black
I purchased the BESTEK 300Watt Pure Sine Wave Power Inverter Car Adapter. It's easy to use by plugging it into the 12-volt. It works well to charge my power station faster at a higher wattage. It was a good buy for the purposes intended.
Reviewed in the United States on October 9, 2024 by G
    • Solidly built, very nearly perfect sine wave, needs external fuse
Color: Black
Review Image by Pete S. Pete S.
Review Image by Pete S. Pete S.
Review Image by Pete S. Pete S.
Review Image by Pete S. Pete S.
Review Image by Pete S. Pete S.
Most inverters output "modified sine wave", which is essentially a stepped square wave approximation of a sine wave. This is perfectly satisfactory for many purposes, like lighting, electronics that use switching power supplies (laptops, phone chargers, etc.), but may cause problems for devices that are quite sensitive to the quality of power they get such as motors, some medical devices, etc. Such devices need a "pure sine wave" inverter, which delivers a smoothly-varying sine wave much like that provided by the electric utility. This inverter is just such a "pure sine wave" model, and outputs a rather nice sine wave (see attached photos). It's a pretty typical sinusoidal wave with a frequency of 59.5 Hz (utility power in North America is 60 Hz, and 59.5 Hz is perfectly acceptable). The peak-to-peak voltage of my unit was 158 V, which corresponds to an RMS voltage of 111 V. This is within the nominal range of 110-120V found in North America, and should be universally compatible with any device. If one zooms in on the waveform, one can see the 24.3 kHz switching steps of about 10 V that the device produces. This is an unavoidable consequence of converting DC to AC, and it's at such a high frequency that it should have no effect whatsoever on any device connected to it. Ideally, I'd like to see some sort of low-pass filter applied to the output of the inverter to filter that 24.3 kHz noise, but then I remembered that this is a $40 item and that such noise isn't going to affect anything. The 12V cord is thick and looks to be the 11 AWG (4mm^2) cable Bestek uses for their battery clamps-to-lighter-socket set. This is perfectly fine for this power level. The 12V plug is spring-loaded and fits snugly into the receptacle. A small fan comes on as needed and isn't terribly loud. Still, it comes on periodically when the unit is idle with no load attached, for which I'm deducting one star from "noise level". The quality of the circuit board on my unit looked fine, with no assembly problems, bad solder joints, etc. There's two small downsides that I've noticed: 1. The fuses are inside the unit, require its disassembly (pop off the rubber feet, unscrew the four screws there, then unscrew the circuit board inside from the supporting posts), and the fuses (two 25A automotive "Mini" size fuses wired in parallel) are soldered to the board. Again, I realized it's built to a price point, but having the fuses soldered to the board rather than being in sockets and preferably accessible from the outside of the unit is incredibly inconvenient. Having an in-line fuse in the cord or 12V lighter plug would be fine as well, but having them be internal and soldered down is annoying. 2. The cord is not detachable. While Bestek offers a nice battery clamps-to-lighter-socket set, it sure would be handy to simply be able to unplug the lighter cord and replace it with a cord with battery clamps that's connected directly to the unit. It'd also make the unit more compact for storage. In short, my initial impression is that the inverter is a perfectly serviceable pure sine wave inverter that is far superior to modified sine wave inverters at only a slight price premium. While it's bulkier than some other inverters for its power level, it's not excessively large. The power it outputs is quite acceptable and makes my home UPSs (which are normally very sensitive to power quality) happy. The lack of easily-replaceable fuses is annoying enough to warrant the deduction of a star; it wouldn't be hard for them to have a higher-rated internal fuse that's there to prevent fires in the event of a major fault and a fuse for the rated current in-line with the cable or in the plug to prevent overheating in the event of a normal overload. Other than the fuse issue, I'm perfectly happy with the unit so far. ... show more
Reviewed in the United States on May 16, 2019 by Pete S. Pete S.
    • Real Sine Waves at this price? 300 Watts? Believe it: It's True
Color: Black
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
Review Image by Staccato von Tosh Staccato von Tosh
I'm an experienced EE by profession and education, a mixed-signal RF/analog/digital guy, and I tested this unit six ways to Sunday (i.e. extensively, see images). It does everything the brochure says it will do, and fully loaded (okay, almost fully, 253 watts of incandescent load), it runs quietly and stays cool as a cucumber. Make that a fresh refrigerated cucumber from where? Whole Foods, of course. Output voltage regulation is excellent; I tested it from 10 VDC in to 14.4 VDC, and it sags only a little, from 114 VAC RMS down to 110 VAC RMS. Your attached appliances will never know the difference. Mine clocked in at 59.99 Hz from 14V in, 60.02 Hz at 10V in; again, your appliances will never know the frequency difference, as frequency regulation is excellent. I ran FFT on the sinusoidal output to check harmonics; the highest was the 4th at 40 dB down. The sinusoidal output is very pure, very clean. Ever the curious one, I took a look inside. Four TO-220 nicely heat-sinked switching FETs (presumably) operating in tandem to drive a series toroidal inductor/capacitor low-pass (shaping) filter. The switching frequency is right at 25 kHz, and pulses range from 760 nS up to whatever width is required to maintain the waveform, depending on load and phase angle. I measured this on the driven side of the L/C output filter, see pics. This unit does generate some hash in the AM radio band, no surprise. It might generate RF noise at higher frequencies including the HF bands (I didn’t test that; hey, this is a free product review), but if you’re a ham radio operator, you’re probably running off of batteries if you need low noise. It’s probably within FCC Part 15 unintentional radiator limits; I didn’t test conducted or radiated emissions either. I bought this unit because my DJI drone battery chargers (3 different drones, 3 different chargers) refused to recognize my older “modified” sine inverters as providing useful AC power. I don’t blame them; whoever named it “modified sine wave” definitely worked in marketing, not engineering. And they’re rude. All of my DJI chargers work fine with this Bestek Sine unit, and why wouldn’t they? They’re being fed a swell, 60-Hz sine wave, just like at home. I highly recommend this unit. It’s internally fused, so you’ll have to do some soldering if you pop the fuse. You need to remember that 300 watts at 120 VAC is only 2.5 amps, but at your 12V input, it’s 25 amps assuming 100% conversion efficiency. Assuming a realistic conversion efficiency north of 80%, that’s 30 amps. Many automotive cigar lighters are fused at 10A. Never replace a 10A fuse with a 30A fuse to keep it from popping. There’s a reason auto manufacturers made that a 10A fuse, and it’s the wiring between your battery/charging system and the cigar outlet. Don’t turn your car into a crispy critter by upping any fuse, certainly not this one. If you need 300W, either make sure your car or truck cigar lighter fuse can handle the 30A, or buy some healthy alligator clips and attach this unit, via dual inline 30A fuses, directly to your battery. It’s also worth noting that most automotive alternators will produce about 50 amps at idle. I plugged three 100W incandescent bulbs to my Bestek 300 W Sine Wave inverter and read 253 watts on my handy Kill A Watt P3 test instrument. I attached it to my 36 AH fishing-motor battery and ran it for several minutes with no discernible heating of the inverter casing or the air at its vents. I also attached my iPhone to the USB output, and the USB outputs on this unit are indeed wired to charge iPhones (proper resistor-divider values on the USB data pins). It measured 1.56A into my iPhone, probably current limited by the phone, for a nice fast charge. The fan seems to have two speeds: modest and off. When operating, it’s fairly quiet. As you might expect, whether the fan runs or not is not so much affected by load; most of the power dissipated in switch FETS is related to moving charge and intermediate resistance value during transitions, not to Rdson losses. Assuming these are FETs (highly likely). I tested low-voltage and overvoltage cutoff points, and found that the unit had hysteresis at both ends, as any good design would. The unit I examined would cut off at 9.77 volts and would stay off until voltage rose to 10.994 volts. For overvoltage, the unit would trip off at 15.57 volts and start back up when voltage dropped below 15.000. Unlike another reviewer, I did not note any beeping sound from the unit when input voltage dropped too low. Note that common wisdom for lead-acid batteries and gel cells says not to take them below 11.6 volts/no load. I’m not sure how that translates to loaded voltage, but exercise caution if running this thing at full load for an extended time repeatedly from a battery that is not being charged. I’m going to give this unit an A+, and I’m a hard grader. And $45.99? At that price point, you may not expect much: you’ll be pleasantly surprised with this Bestek unit. Worth every penny. And no, I’m not on the company’s payroll; just pleasantly surprised and impressed with this unit’s design excellence and manufacturing quality. That and I was a little bored today, thought I would take some measurements and share my insights. Can you tell? :) ... show more
Reviewed in the United States on March 15, 2021 by Staccato von Tosh Staccato von Tosh
    • Perfect!
Color: Black
I gave to my husband for his birthday. It converts DC 12V to AC 110V efficiently, providing clean and stable energy, which is great for sensitive electronics like laptops. The dual USB ports (4.2A) allow for fast charging of multiple devices simultaneously. Its compact design fits easily in the car, and the built-in cooling fan ensures it stays cool during use. Perfect for road trips, camping, or emergencies, this inverter is reliable, quiet, and easy to use ... show more
Reviewed in the United States on October 16, 2024 by Smp
    • Would buy again
Color: Black
Works great !!!
Reviewed in the United States on September 26, 2024 by Micah Weiss
    • Good value
Color: Black
No load current draw is .7 amps. Fan runs any time switch is on, but very quiet. USB-a ports are always on, even when power switch is off. Output voltage is 110 which is acceptable, but I’d rather see 115-120 volts which is more like grid voltage. Still, for the price, a good unit.
Reviewed in the United States on August 19, 2024 by Don

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