Product Features and Description
- Top-Ranked Brand: BESTEK power inverter is a leading brand in America known for its high-quality power inverters. It offers 300 Watts continuous DC to AC power and 700 Watts instantaneous power, featuring 2 AC outlets and 2 USB ports.
- Quick Charging: The BESTEK power inverter comes with two 110V AC outlets perfect for charging larger devices like laptops and tablets, along with 2 USB charging ports (0-2.4A), making it an excellent choice as a necessary car accessory for universal travel adapter.
- Portable Design: The power inverter from BESTEK is designed to be ultra-compact and lightweight, similar in size to an iPhone, making it ideal for vacations, work trips, and camping. It includes a 24-inch cigarette lighter plug that allows it to be plugged into almost any vehicle.
- Comprehensive Protection: The BESTEK power inverter comes with a built-in 40 amps fuse for device protection. Its safe charging design offers protection against overheating, under and over-voltage charging, and short-circuiting.
- Durability and Silent Operation: The power inverter has a durable metal housing that provides superior protection from drops and bumps. Its smart cooling fan system ensures silent operation. The fan speed increases when the device heats up or when the output power exceeds 70W. It also comes with an 18-month warranty.

The BESTEK Power Inverter, recognized as America’s top power inverter brand, ensures a reliable transformation of 300 watts continuous DC to AC power and delivers a peak power of 700 watts. This premium product, specifically designed for DC 12V and Car use, is not compatible with DC 24V and airplane use. Boasting of 2 USB ports and 2 AC outlets, it provides an efficient solution for powering your devices on the go. However, it’s recommended to keep one USB port free when charging your iPad through the 2.1A USB port.
The power inverter’s exterior is made of high-quality Aluminium alloy, ensuring a solid and durable structure that can withstand severe environments. Its smart cooling fan system ensures silent operation, with the fan speed increasing when the device gets warmer or when the output power exceeds 70W. This design provides protection against overheating, under and over voltage charging, short circuiting, overloads, and overcharging. It also includes two smart USB charging ports that can intelligently detect your devices and deliver the best-matched charging current for fast charging speed. Each port offers auto 0-2.4A, with a total output of 4.8A.
The BESTEK Power Inverter also functions as a universal travel adapter, making it a perfect companion for long trips. The 24-inch cigarette lighter plug allows the power inverter to be plugged into almost any vehicle, transforming it into a universal power inverter for car adapter. With a lighter socket that can withstand up to 5000 insertions and extractions, it ensures a stable and secure connection. Built-in USB charging ports and a plug-in buckle design provide a stable current for high-speed charging. Its unique ability to power LED lights makes it ideal for creating festive atmospheres during Christmas and other celebrations.

- Product Dimensions: 4.8 x 3.1 x 1.9 inches
- Item Weight: 10.1 ounces
- ASIN: B004MDXS0U
- Item model number: MRI3011BU
- Best Sellers Rank: #514 in Automotive (See Top 100 in Automotive) #6 in Power Inverters
- Is Discontinued By Manufacturer: No
- Date First Available: February 5, 2011
- Manufacturer: BESTEK
- Country of Origin:
- Brand:
- Model:
- Manufacturer Part Number:
- Voltage: 12 to 110 volts
- Wattage: 300w
- Package Dimensions:

Navigating the Trade-offs: The Upsides and Downsides of the Product
Several customers have expressed satisfaction with the product, citing its usefulness for a range of applications. A customer, Nkarna, mentioned how the product served as an excellent inflator for an air mattress during a camping trip, scoring it a 5-star rating. Similarly, Tina Garbarino claimed it to be the best power inverter she had used after going through three others. She also pointed out that it’s a product you can’t cheap out on, indicating its quality.
The compact size and charging capabilities of the product also seem to have won over many users. Richard Kearney commended the product for its efficiency, allowing him to use Bluetooth in his 2003 Tacoma. Another user, Michael, applauded the product’s portability, stating that it worked well with his small laptop in his car. Users also appreciated the inverter’s low noise level while in use.
Furthermore, the product’s long-term performance and durability have also been highly praised. As noted by user T. Estrick, the product has remained sturdy, durable, and reliable even after several years of use. For Krystal, it has become a constant companion during car trips and camping, used frequently to charge a computer and phone.
Despite the numerous positive reviews, the product has also received its share of criticism. Several customers expressed disappointment over the product’s reliability and functionality. For instance, user Mumbles complained about the product going into fault mode without anything plugged in. Nursing101 shared a similar experience, stating that the product did not work the first time it was used right out of the box.
Other users have had issues with the product’s longevity and its impact on other devices. Derek Ramp, for instance, lamented how the product burned through three fuses in his truck after just two uses. Another customer, Just me, was upset that the product broke the auxiliary power outlet in their new car after one use.
Lastly, some customers questioned the product’s power capabilities. Charles Stark noted that the product doesn’t do anything a cigarette adapter wouldn’t do and that it doesn’t power much. Mike also reported that the inverters do not work properly, turning on and off every second, making it impossible to charge. He further criticized the company’s customer service for not responding to messages for help or warranty.
What do the stars speak of?
Opinions about this product were divided in such a proportion among the buyers.
I was really worried because I have an air mattress that has a built in pump, i didn’t know if that was going to be an issue. But damn! This thing really pulled through and did an amazing job. Totally need this if you’re inflating beds/floats on a camping trip. Totally awesome.
Goes in fault mode without anything plugged in! 🤬

Queries & Clarifications: All You Need to Know
1. How does the BESTEK 300W power inverter for car work?
The BESTEK 300W power inverter works by converting DC 12V power from your car’s battery into AC 110V power. This allows you to power or charge devices such as laptops, phones, tablets, and other electronic devices in your car. The inverter plugs into your car’s cigarette lighter socket and has 2 USB ports and 2 AC outlets for connecting your devices.
2. Is the BESTEK 300W power inverter a universal adapter?
Yes, the BESTEK 300W power inverter can be considered a universal adapter as it can be used to power or charge a wide range of electronic devices. However, it’s essential to note that the inverter is designed for use with DC 12V and cars only. It’s not suitable for DC 24V and airplane use.
3. Can the BESTEK 300W power inverter handle high power electric devices?
No, it’s not recommended to use the BESTEK 300W power inverter to power high power electric devices such as hair dryers and electric heaters. These might draw too much power and blow a fuse in the inverter.
4. Is the BESTEK 300W power inverter safe to use?
Yes, the BESTEK 300W power inverter is safe to use. It features a safe charging design that provides protection against overheating, under and over voltage charging, short circuiting, overloads, and overcharging. Its aluminium alloy shell also protects the internal components from severe environments.
5. Does the BESTEK 300W power inverter get hot during operation?
It’s normal for the inverter to become warm to the touch while you are using it. The inverter has a smart cooling fan system that operates silently and runs faster when the device gets warmer or when the output power exceeds 70W to keep it cool.
6. How many devices can the BESTEK 300W power inverter charge at the same time?
The BESTEK 300W power inverter has 2 USB ports and 2 AC outlets, so you can charge or power up to four devices at the same time. However, it’s important to ensure that the total power consumption of the devices does not exceed the inverter’s capacity.
7. Can the BESTEK 300W power inverter be used for long road trips?
Yes, the BESTEK 300W power inverter is an ideal choice for long road trips. It can keep your devices powered or charged during your trip, and its durable design allows it to withstand the rigours of travel.
8. How long is the cable that connects the BESTEK 300W power inverter to the car’s cigarette lighter socket?
The cable that connects the BESTEK 300W power inverter to the car’s cigarette lighter socket is 24 inches long. This gives you some flexibility in where you place the inverter in your car.


Jason E –
Don’t buy
Bought, arrived on time. Product did not work.
Don Keach –
AC output is only 85 volts.
I measured the output with a DVM and it was only 85volts AC.
Franklin –
Awesome!!
Purchase the car adapter for an employee who use her laptop to process inspections in rural areas of the state of Florida.
RatedR –
Works
Great for price
Rob Van Alstyne –
Kept Laptop charged during trip
I recently did a road trip which was was a seven hour drive one way. My girlfriend works as a court reporter and used this charger during the whole trip. Kept the laptop charged at 100%.
Kevdog.1 –
Works great!
It’s small, lightweight ,works good, doesn’t get hot. I definitely recommend.
GG. –
Great power inverter for my car!
I use this power inverter with my BMW X5 and it works really well. Shop with confidence!
G. T. Hood –
Great for powering your computer while on the road!
This is a very dependable, yet inexpensive unit that performs exactly as described. It is quiet and did not overheat like some others I have used in the past. Great price, and delivered “Amazon-fast.”
Diane R 87144 –
Great
Great for travel, easy to use.
Kim Westbrook –
BEWARE
I guess this was too powerful for my chevy malibu’s battery. Took on a camping trip to blow up the air matress and it completely killed my battery (less than a month old battery) and left us stranded. Had to call triple a to save the day.
Jimmy P –
MUST HAVE
IF YOUR CAR DOESN’T HAVE AN AC OUTLET THEN YOU NEED TO GET ONE OF THESE INVERTERS. THEY COME IN HANDY FOR ALL KINDS OF DEVICES AND THEY ARE SMALL ENOUGH TO FIT ALMOST ANYWHERE. WORKS GREAT!
Jeffrey J. Dunn –
Fails when battery is at 12.2 volts
This inverter works well enough when the car is running or the battery is 100% charged. Unfortunately, it fails when the battery drops to 12.2 volts, which is well over 50% charge. Good inverters cut off at 10.5 volts
Martin –
Didn’t work!
Unfortunately this didn’t work in my Tesla Model Y. Went camping and bought this to blow up a few things and unfortunately it did not work. I should have tested it prior to the trip. So I give it a 3/5 stars
Yess –
Nice
I like it
Mark Monroe –
Bestex 300w inverter
Loww quality product. Save your money and get a better one.
Marc Sweet –
Simple power needs
I’ve only used this to pump up an air mattress while camping, but it did that without fail. You could also charge everything at once if you had the right charger connected to this. I think it’s a good unit and better than just running a cheap truck stop plug out of the 12 volt. I haven’t tested it to the max, but it seems to have enough features to not threaten the integrity of the electrical systems of which it is working with
DEBORAH L BELL-HARRIS –
Car charger adapter
Awesome product
Chris guajardo –
Power extender
Works
Amazon Customer –
Works well
Works well, USB ports are strong enough to charge devices, small and light weight. I use for charging batteries for power tools, no problems
Patrick M. –
Nice, as expected
has lasted 3 years
chasity –
A must have!
It work great!
April Raber –
Great product
Took it for 3 days of camping and used it for blowing up air mattresses (too often), cpap machine, charging phones and watches. Worked perfectly for all our needs!
Lil Bo Peep –
Burned the wiring
It burned the wiring in my car (the fuses were fine) and now I have to get my car serviced and pay god knows how much
Edgar Guzman –
Good IF you hardwire it to your battery or car fuse panel
Cigarette lighters are limited to 20A (240 watts). I actually ruined my cigarette lighter because I thought I’d be slick and slip a 25A fuse in my truck to extract the full 300 watts capability (in spite of fact that I bought this to run a 225 watt battery charger) Well…even at 20A, the cigarette lighter plug got so hot that it actually melted my back end of the outlet in my truck, where the 12v OEM plug connects into the main wiring harness. This resulted in fuses shorting out the second I would replace them. $20 later, I had the plug replaced in my car. Since this inverter has its own on/off switch, I snipped the plug off, put on ring terminals and a fuse holder, got a 25amp fuse on, and hardwired it. I figured that I’d manually shut this thing off as needed. That made go from “hate it” to “love it.” Minus one star because it blew my 12v outlet in the truck and made me spend $20 and an hour to fix.
Alejandro Nava –
Good product
Useful. I was running without problems for 5-10 hrs with a load of 200 W (Laptop charger)
Jeremiah Donaldson –
Lasted 4 years
This thing finally gave up the ghost, but feel I got my money’s worth out of it. May tear it apart and see if there’s a fuse or anything I can fix inside of it (but doubt it’s fixable). It was used on a line running to two 100 w solar panels and a 100 w turbine to power the internet modem and wifi during storm power outages and to charge phones, ecigs, and lawn mower batteries. I probably got up to x10 its cost in ‘free’ power out of it over the 4 years. Recommended, will probably buy another.
Ashley Wieben –
Didn’t work when I took it out and plugged it in
Very disappointed this didn’t work. I bought it ahead of time for a work trip and just tried to use it and it didn’t work 🙁
Mark Klockars –
WORKS GREAT!
TOOK THIS CAMPING AND IT CHARGED ALL OF OUR DEVICES AS WELL AS CONSTANT POWER FOR OUR PORTABLE STEREO ALL NIGHT!
C. Clausen –
Works great
This worked great on our trip. It has an on off switch, which was really handy. We would recommend it.
Jeff P. –
Worked as expected
Worked as expected
ConsciousConsumer –
Worked once
It worked the first time I used it. Tried using it again recently and the outlets didn’t work only the USB ports. Quality and longevity bad. Would not buy again.
Excelente –
Cumplió mis expectativas
Excelente
Suzanne –
Great Inverter
Very compact in size but worked well for me while camping. I success with plugging it in to both a battery pack and my vehicle. I used it to charge my phone and to charge my CPAP machine!
Andcarweb –
buen producto
Es un buen producto calidad precio, me ha funcionado muy bien, pensaría en cambiarlo después por uno de mayor cantidad de watts.
Priya Saini –
Good Product for Car Laptop Charging
We really like this product as it’s really useful when you are driving for a long and need laptop to use it let your laptop work wherever you go.
Orange Cowboy –
quieter than the 150w
I had the 150w for a few years and it was great. I needed another inverter and bought this 300w. Surprisingly it is quieter than the 150w
Jay –
So far so good.
Needed for keeping my laptop charged while in car. So far doing a great job. Did not have any issue with fan noise or overheating. Will keep an eye on that to assure it won’t start acting on me.
Robert A. Staton –
Very tiny.
The size of these things keeps getting smaller. I use mine to run a Starlink dish and router off of a lithium battery, 24/7/ 365. The router only needs probably less than 100 W.
Nicole Vivante –
Don’t waste your money
Ordered this is Feb and it broke after a handful of uses in June. The seller claims to have a 5 year warranty. Well, I have called and left them at least 10 messages to replace my item that is under warranty and they haven’t called me back. I’ve called upwards of 20 times and have never had anyone answer the phone. I called amazon for help and they were also useless, couldn’t help me or do anything at all. Don’t waste your money or time on this
LaDonna Nickason –
Love this
I gave it to my daughter to use. She’s the one that has to do school work on lap tops sometimes
Amazon Customer –
works great
good price, used it every day for a few weeks now and it works great.
StuffBuyer0001 –
Only ONE Problem
It’s great for what it is. The 12V socket limits its available current, so things charge pretty slowly. But it works. Pretty durable feel for its price, and the cord is long enough. The problem is a very loud high pitched whining noise from inside. Somewhere in the power supply circuit I’m guessing. I’m hoping it doesn’t burn out soon or… burn up…
Car_Guy –
7 Year Review
You need one of these in your life. This thing has seen consistent use over the past 7 years. And it has never let us down or skipped a beat. The ability to plug in multiple phones over a long road trip is unbeatable. I’ve even used it to charge a laptop while driving (though I wouldn’t recommend having other things plugged in at the same time). Excellent device with extremely high utility.
Michael Smock –
broken within 2 months
heard good things about this product, seemed to take a dump on me after a month and a half and that is with not using it everyday. i am unable to charge my phone using either the usb port or the plug i’ve used different cords and different 12v outlets and still nothing just disappointing tried calling the company and every extension went straight to voice mail. don’t waste your money on this product
Chris Smith –
Stopped Working after a few time of use
I like the product initially before it just stopped working. Bought this in case of an emergency. I guess it’s best to know this product wouldn’t last during an emergency. Disappointing
Rick –
Perfect performance and quiet
Great product and great price
Karen –
Bought 2
These are Great for me. I work remote and can take my laptop in the car on road trips and fully keep the laptop charged.
Bien Yen –
Great Product
Works well
Stroiker –
Inverter
Not exactly what we were looking for. Did not work.
Luis nunez –
Execelent
It is cover all my expectations