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frontpageDesertGardener | Staff posted May 05, 2026 03:56 AM

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frontpageDesertGardener | Staff posted May 05, 2026 03:56 AM

BESTEK 300W Car Inverter DC 12V to AC 110V w/ 2 AC Outlets & Dual 4.8A USB Ports

$20

$35

42% off

Amazon

22 Comments 8,977 Views

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BESTEK. via Amazon has BESTEK 300W Car Inverter DC 12V to AC 110V w/ 2 AC Outlets & Dual 4.8A USB Ports (MRI3011BU) on sale for $25.99 - $6.50 (25%) off when you apply promo code 22AGAK6A on the checkout page = $19.49. Shipping is free w/ Prime or on $35+ orders.

Thanks to Staff Member DesertGardener for sharing this deal.

About this product:

300W continuous power with 700W instantaneous peak output
11-17V input voltage compatible with Tesla vehicles
Dual 4.8A USB ports for fast charging of mobile devices
Aerospace aluminum housing with built-in 40 amp fuse
Smart cooling fan activates when output exceeds 70W

Editor's Notes

Written by jimmytx | Staff

About this Store:
- BESTEK. via Amazon has a 4.9 out of 5 star seller rating based on over 380 customer reviews within a 12 month timeframe.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
Additional Information:
- Rated 4.5 out of 5 stars on Amazon based on over 33.7k customer reviews.
- Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by DesertGardener | Staff

300W continuous power with 700W instantaneous peak output
11-17V input voltage compatible with Tesla vehicles
Dual 4.8A USB ports for fast charging of mobile devices
Aerospace aluminum housing with built-in 40 amp fuse
Smart cooling fan activates when output exceeds 70W

Editor's Notes

Written by jimmytx | Staff

About this Store:
- BESTEK. via Amazon has a 4.9 out of 5 star seller rating based on over 380 customer reviews within a 12 month timeframe.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
Additional Information:
- Rated 4.5 out of 5 stars on Amazon based on over 33.7k customer reviews.
- Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.

Original Post

Written by DesertGardener | Staff

Deal Score

+30

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Price Intelligence

Model: BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter

Deal History

Sale Price

Slickdeal

$NaN

Today

Post Date	Sold By	Sale Price	Activity
11/27/20	Amazon	$20	1
01/16/20	Amazon	$17	4
12/16/19	Amazon	$17 Popular	21
11/09/18	Amazon	$20 Popular	19

Current Prices

Sort: Lowest to Highest | Last Updated 5/24/2026, 04:45 PM

Sold By	Sale Price
Amazon	$24

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Top Comments

VisionJD

50 Posts

10 Reputation

It's fine for incidental stuff. Don't expect pure sine wave at that price. Also take the 300w rating with a serious grain of salt. Most car sockets will provide 12v10a max so expect about 120w reliably. Some will go up to 180w at 12v. Check your vehicle manual.

22 Comments

Shopinfellow

May 05, 2026 04:05 AM

277 Posts

Joined Jan 2012

ShopinfellowMay 05, 2026 04:05 AM

277 Posts

Donot buy this brand... it just burns out quickly, my 2 cents

jetcityjef

May 05, 2026 06:45 AM

1,209 Posts

Joined Oct 2012

jetcityjefMay 05, 2026 06:45 AM

1,209 Posts

Quote from Shopinfellow

Donot buy this brand... it just burns out quickly, my 2 cents

you may need to round up your advice to a nickel as they don't make pennies anymore

VisionJD

May 05, 2026 01:27 PM

50 Posts

Joined Sep 2025

VisionJDMay 05, 2026 01:27 PM

50 Posts

Our community has rated this post as helpful. If you agree, why not thank VisionJD

JasonM5329

May 06, 2026 04:35 AM

233 Posts

Joined Mar 2018

JasonM5329May 06, 2026 04:35 AM

233 Posts

Had the last one stolen out of my truck. Thx.

chaimav

May 06, 2026 10:14 AM

363 Posts

Joined Nov 2010

chaimavMay 06, 2026 10:14 AM

363 Posts

Quote from VisionJD

You forgot the conversion efficiency. 120w in is maximum 110w out. (Although 12v is not really accurate either... Fully charged is 12.6v and if the alternator is running probably somewhere around 14.5v)

techreviewshop

May 07, 2026 08:21 AM

1,457 Posts

Joined Feb 2011

techreviewshopMay 07, 2026 08:21 AM

1,457 Posts

I've had this model for about 2 years. It has worked well for me, but I don't use it often.

Zeo

May 07, 2026 08:56 AM

585 Posts

Joined Nov 2015

ZeoMay 07, 2026 08:56 AM

585 Posts

That last pic... "Your cerificated choice."

CivilEng

May 07, 2026 12:54 PM

30 Posts

Joined Oct 2019

CivilEngMay 07, 2026 12:54 PM

30 Posts

Still it is not cleqr to me what type of electric devices I can use with it. Can I use like two lights without issue? Or it just works with lpw wattage devices like phones?

matdave

May 07, 2026 01:26 PM

444 Posts

Joined Apr 2011

matdaveMay 07, 2026 01:26 PM

444 Posts

Quote from CivilEng

Still it is not cleqr to me what type of electric devices I can use with it. Can I use like two lights without issue? Or it just works with lpw wattage devices like phones?

As the other commenter said, it's likely about a 120w output if used with a car. It won't power a blender, but it will power lights.

TealSpaniel3837

May 07, 2026 01:43 PM

329 Posts

Joined Feb 2025

TealSpaniel3837May 07, 2026 01:43 PM

329 Posts

Quote from matdave

As the other commenter said, it's likely about a 120w output if used with a car. It won't power a blender, but it will power lights.

I've always wanted to try one with a PSone with the folding LCD screen for my work truck😅

JayW7752

May 07, 2026 01:50 PM

533 Posts

Joined Mar 2017

JayW7752May 07, 2026 01:50 PM

533 Posts

You kind of have to put this on a figurative scale: what you're paying vs what you're getting. And for $20, it's an ok deal to throw in the car and "hope" it works when you need it. $20 is the key. Harbor Freight's cheapest unit is $24 for 120/240 (continuous/peak wattage).
Is it a good deal for the price? Sure. Would I buy one knowing what I know? No, I'd spend more and buy a larger wattage pure sine unit only because I already have something like these in 2 of my vehicles.

trkndude299

May 07, 2026 08:47 PM

1,073 Posts

Joined Oct 2018

trkndude299May 07, 2026 08:47 PM

1,073 Posts

I have 3 of these and they are a modified pure sine wave - not a pure sine wave. Your sensitive electronics will know the difference, and so will your solar batteries when it comes to recharging them.
I have a dedicated 20amp (12v) outlet and it will charge my 140 watt laptop and my cell phone at the same time. The usb ports do work but they are slow.
All the safety features work as advertised. If you over tax the unit, it will sound an alarm and shut down.
Do not leave these plugged in when you shut off the car / truck. They will kill your batteries with the parasitic draw. Well, at least they have mine.

For $20, these have become a niche inverter charger.

landlord73

May 07, 2026 09:03 PM

35 Posts

Joined Dec 2025

landlord73May 07, 2026 09:03 PM

35 Posts

Came up $25.99 for me. Also this is not a pure sine wave inverter. You can tell because experts like the review from the professional electrician with the expensive Fluke meter says it doesn't put out 120v. Apparently he's not as professional as he thinks because he doesn't understand the concept of RMS voltage. I have two of the Bestek 500 watt pure sine inverters that are several years old and work great, used them several times with deep cycle batteries during outages but I don't have any use for more inverters that are not pure sine. Even though modified sine is just fine for most applications.

Last edited by landlord73 May 7, 2026 at 02:10 PM.

kentucky7887

May 08, 2026 02:46 AM

254 Posts

Joined Nov 2014

kentucky7887May 08, 2026 02:46 AM

254 Posts

I have the one with USB-C. I like it and use the plugs for charging DeWalt batteries. I keep it in my truck all the time. I don't use a phone charger anymore, but this one with USB-C.

SplendidPocket588

Pro

May 08, 2026 03:16 AM

660 Posts

Joined Mar 2021

SplendidPocket588

Pro

May 08, 2026 03:16 AM

660 Posts

Quote from jetcityjef

you may need to round up your advice to a nickel as they don't make pennies anymore

2 copper cents is worth more than a nickel, keep your coppers!

Unregistered (You)

Autos Auto Electronic Accessories Tech & Electronics Tech Accessories Chargers & Power Banks Amazon

Rating:	(4.5 out of 5 stars)
Reviews:	33,722 Amazon Reviews
Manufacturer:	BESTEK
Model Number:	MRI3011BU
Product SKU:	B004MDXS0U
ASIN:	B004MDXS0U
Brand:	BESTEK
Item Dimensions LxWxH:	4.8 x 3.1 x 1.9 inches
Item Weight:	0.9 pounds
Item model number:	MRI3011BU
Manufacturer:	BESTEK

BESTEK 300W Car Inverter DC 12V to AC 110V w/ 2 AC Outlets & Dual 4.8A USB Ports

$20

$35

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BESTEK 300W Car Inverter DC 12V to AC 110V w/ 2 AC Outlets & Dual 4.8A USB Ports

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