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DesertGardener | Staff 12.8K Views
May 5, 2026 3:56 AM

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

$20

$35

42% off
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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:
  • Additional Information:
    • 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
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
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:
  • Additional Information:
    • 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

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Top Comments

VisionJD
84Comments
14Reputation
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.
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Community Reviews

This compact 12 volt to 110 volt inverter is best for light car use, like charging laptops, phones, dash cams, small fans, and rechargeable lights. The modified sine wave output works for many everyday devices, and the safety features, alarm, and shutdown behavior are described as working properly. The USB ports are slow, the 300 watt rating is treated cautiously, and real-world output is closer to about 100 to 150 watts from a vehicle socket. It can also draw power when left plugged in, so it is better suited to short, on the road use.

  • The inverter can work well for low-draw electronics like laptops, phones, dash cams, and small fans.

    techreviewshoptrkndude299

  • The modified sine wave output can still fast-charge many devices when using compatible wall warts.

    trkndude299trkndude299

  • The safety features can trigger an alarm and shut down when the unit is overtaxed.

    trkndude299

  • The USB-C version can be used to charge DeWalt batteries in a truck setup.

    kentucky7887

  • The advertised 300W rating can be overstated because car sockets may limit output to around 120W or less.

    VisionJDchaimavletatanu

  • The inverter is a modified pure sine wave rather than a pure sine wave, which can affect sensitive electronics.

    trkndude299landlord73

  • The USB charging ports can be slow, with laptop charging taking hours via USB-C compared with faster AC plug use.

    trkndude299trkndude299

  • The unit can drain vehicle batteries through parasitic draw if left plugged in after shutting off the car.

    trkndude299trkndude299

Common Questions (5)

AI-generated summary based on comments from the community. Updated ago

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22 Comments

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May 8, 2026 4:11 PM
103 Comments
Joined Nov 2015
letatanuMay 8, 2026 4:11 PM
103 Comments
It says "300W", but you actually only get 150W at max from the car's cigarette lighter. So, what is the point for saying 300w here?
May 9, 2026 2:11 AM
3.4K Comments
Joined Jun 2010
boobolooMay 9, 2026 2:11 AM
3.4K Comments
Quote from VisionJD View quoted comment :
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.
also if you have a small car altenator it can be a strain.
May 9, 2026 12:27 PM
130 Comments
Joined Jun 2014
BabolatMay 9, 2026 12:27 PM
130 Comments
Don't know how reliable this brand is.
May 9, 2026 8:18 PM
37 Comments
Joined Dec 2025
landlord73May 9, 2026 8:18 PM
37 Comments
Quote from VisionJD View quoted comment :
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.
Mine actually goes to 20 amps but that's still not 300 watts even on a good day.
May 9, 2026 8:32 PM
37 Comments
Joined Dec 2025
landlord73May 9, 2026 8:32 PM
37 Comments
Quote from chaimav View quoted comment :
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)
Actually yes. But none of these cheap inverters I've measured are quite that efficient, and efficiency varies with load. I actually had this exact inverter for testing before I gave it away. 120w in gave me 103.2w out.
May 11, 2026 8:06 PM
37 Comments
Joined Dec 2025
landlord73May 11, 2026 8:06 PM
37 Comments
Quote from CivilEng View quoted comment :
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?
You should easily be able to use two LED lights with it, but I'm asking why you would. You're taking a conversion loss in the inverter and this is an expensive way to run a light when you could just use a flashlight or a rechargable LED camping light.
May 12, 2026 3:57 PM
1.2K Comments
Joined Oct 2018
trkndude299May 12, 2026 3:57 PM
1.2K Comments
Quote from CivilEng View quoted comment :
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?
I use mine for laptops, phones, etc. Dash cams, recharge all my rechargeable lights, small fans, wifi, routers, modems, etc. Toys of all kinds.
The modified sine wave will fast charge all devices if you have the proper wall warts. The newer pure sine wave will work on newer electronics.
The USB ports are very slow to charge devices, even if using fast charge cables. Slow, as in hours to charge my laptop via USB C, vs 25 minutes or so while using the 140a AC plug.
You can't charge these all at once, I'm trying to give you usage ideas.

These will not work for ac power tools, or really anything that needs more amps than a fan. There are other inverters that do that, but not anywhere near this price point.
Also, make sure you're driving while charging devices. These inverters are small but they will kill your battery quick. Even if just plugged in, they have a high parasitic draw.

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