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  • COVERAGE: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one.
  • EASY CLAIMS PROCESS: File a claim anytime online at www.Asurion.com/Amazon or by phone. Most claims approved within minutes. If we can’t repair it, we’ll send you an Amazon.com Gift Card for the purchase price of your covered product or replace it.
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  • MORE DETAILS: Additional information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase (if you do not see this email, please check your spam folder). Contact us if you cannot locate your plan confirmation and Terms & Conditions via email at AmazonFeedback@Asurion.com.

3 Year Electronics Protection Plan

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  • COVERAGE: Plan starts on the date of purchase. Malfunctions covered after the manufacturer's warranty. Power surges covered from day one.
  • EASY CLAIMS PROCESS: File a claim anytime online at www.Asurion.com/Amazon or by phone. Most claims approved within minutes. If we can’t repair it, we’ll send you an Amazon.com Gift Card for the purchase price of your covered product or replace it.
  • EXPERT TECH HELP: Real experts are available 24/7 to help with set-up, connectivity issues, troubleshooting and much more.
  • MORE DETAILS: Additional information about this protection plan is available within the “Product guides and documents” section. Simply click “User Guide” for more info. Asurion will also email your plan confirmation with Terms & Conditions to the address associated with your Amazon account within 24 hours of purchase (if you do not see this email, please check your spam folder). Contact us if you cannot locate your plan confirmation and Terms & Conditions via email at AmazonFeedback@Asurion.com.

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

4.6 out of 5 stars 4,574 ratings

$49.99
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Brand BESTEK
Wattage 300 watts
Color Black
Item Dimensions LxWxH 8.1 x 5.3 x 2.6 inches
Total Power Outlets 4

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

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  • BESTEK 300Watt Pure Sine Wave Power Inverter Car Adapter DC 12V to AC 110V with 4.2A Dual Smart USB Ports
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  • Hermitshell Hard Travel Case for BESTEK 300Watt Pure Sine Wave Power Inverter Car Adapter
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  • NOCO GC019 15A 14AWG 12V Adapter, Heavy-Duty Cigarette Lighter Plug, and Male to Female Socket with 12-Foot Extension Cord
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Product Description

Designed for your devices that require careful protection

300W Pure Sine Wave Banner
Red White Black 500W pure sine wave black and silver
BESTEK 300W power inverter(red) BESTEK 200W power inverter(white) BESTEK 200W power inverter(black) BESTEK 500W Pure Sine Wave Power Inverter (Red) BESTEK 75W power inverter(black and silver)
Color Red White Black Red Black and silver
Power 300W 200W 200W 500W 75W
Feature Smart cooling fan ETC and Smart cooling fan ETC and Smart cooling fan Smart cooling fan Smart cooling fan
isolation voltage protection
USB Port 4.2A Dual USB 4.2A 4 USB 4.2A 4 USB 4.2A Dual USB 3.1A Dual USB
Dimension 4.8 x 3.1 x 1.9 inches 6.2 x 3.3 x 1.4 inches 6.2 x 3.3 x 1.4 inches 8.7 x 4.3 x 2.4 inches 5.5 x 2.4 x 1.6 inches

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


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Compare with similar items


BESTEK 300Watt Pure Sine Wave Power Inverter Car Adapter DC 12V to AC 110V with 4.2A Dual Smart USB Ports
BESTEK 300Watt Pure Sine Wave Power Inverter DC 12V to AC 110V Car Plug Inverter Adapter Power Converter with 4.2A Dual USB Charging Ports and 2 AC Outlets Car Charger, ETL Listed
500W Pure Sine Wave Power Inverter DC 12V to AC 110V Car Inverter Power Adapter Converter with Type C PD18W/12V DC Output/4.8A Dual USB Charging Ports and 2 AC Outlets Car Charger
LEICESTERCN 300W Pure Sine Wave Power Inverter DC 12V to 110V AC Car Converter 2 AC Outlets with 4.8A Dual USB Ports & 1 Type-C Port
BESTEK 500W Power Inverter DC 12V to 110V AC Converter with Alligator Battery Clamp 4.8A Dual USB Car Charger ETL Listed
Pure Sine Wave Power Inverter 300Watt Car Adapter Converts 12V DC to 120V AC with 4.8A Dual USB and 2 AC Outlets for Tablets Laptops Smartphones
Customer Rating 4.6 out of 5 stars (4574) 4.5 out of 5 stars (489) 4.3 out of 5 stars (334) 4.4 out of 5 stars (813) 4.6 out of 5 stars (4782) 4.4 out of 5 stars (721)
Price $49.99 $54.98 $62.98 $39.99 $45.99 $51.96
Shipping FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details
Sold By BESTEK. BESTEK. ALLWEI LEICESTERCN Direct BESTEK. Giandel
Brand Name BESTEK BESTEK ALLWEI LEICESTERCN BESTEK Giandel
Input Voltage 12 volts 12.0 volts 12 volts 12.0 volts 12 volts 12.0 volts
Item Dimensions 8.1 x 5.3 x 2.6 inches 7.91 x 4.33 x 2.13 inches 6.2 x 3.1 x 1.5 inches 7.28 x 4.33 x 2.44 inches 6.22 x 4.13 x 1.77 inches
Item Weight 1.40 lbs 2.86 lbs 1.30 lbs 2.30 lbs 1.66 lbs
Output Voltage 120.0 volts 110.0 volts 110.0 volts 110.0 volts 110.0 volts 120.0 volts
Total Power Outlets 4 4 4 5 4 2

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4.6 out of 5 stars
4.6 out of 5
4,574 global ratings

Top reviews from the United States

Reviewed in the United States 🇺🇸 on March 15, 2021
Color: BlackVerified Purchase
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5.0 out of 5 stars Real Sine Waves at this price? 300 Watts? Believe it: It's True
By Staccato von Tosh on March 15, 2021
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? :)
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Reviewed in the United States 🇺🇸 on November 22, 2022
Color: BlackVerified Purchase
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Reviewed in the United States 🇺🇸 on November 16, 2022
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Reviewed in the United States 🇺🇸 on November 22, 2022
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