---
product_id: 101904645
title: "BESTEK Pure Sine Wave Power Inverter, 300W DC 12-17V to 110V AC Car Adapter | Vehicle Plug in Cigarette Lighter Outlet Solar Inverter, 4.8A Dual USB Fast Charging Ports for Phone, Laptop, CPAP(Black)"
brand: "bestek"
price: "338.69 DT"
currency: TND
in_stock: true
reviews_count: 13
category: "Bestek"
url: https://www.desertcart.tn/products/101904645-bestek-pure-sine-wave-power-inverter-300w-dc-12-17v
store_origin: TN
region: Tunisia
---

# 300W continuous pure sine power 2 AC + 2 USB fast charging ports Smart fan & vent cooling system BESTEK Pure Sine Wave Power Inverter, 300W DC 12-17V to 110V AC Car Adapter | Vehicle Plug in Cigarette Lighter Outlet Solar Inverter, 4.8A Dual USB Fast Charging Ports for Phone, Laptop, CPAP(Black)

**Brand:** bestek
**Price:** 338.69 DT
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your mobile lifestyle with pure sine wave precision!

## Quick Answers

- **What is this?** BESTEK Pure Sine Wave Power Inverter, 300W DC 12-17V to 110V AC Car Adapter | Vehicle Plug in Cigarette Lighter Outlet Solar Inverter, 4.8A Dual USB Fast Charging Ports for Phone, Laptop, CPAP(Black) by bestek
- **How much does it cost?** 338.69 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/101904645-bestek-pure-sine-wave-power-inverter-300w-dc-12-17v)

## Best For

- bestek enthusiasts

## Why This Product

- Trusted bestek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual AC & USB Ports:** Charge laptops, phones, and gadgets simultaneously with 2 AC outlets plus 2 smart USB ports up to 4.8A max.
- • **Pure Sine Wave Power:** Delivers clean, stable 300W AC power—perfect for sensitive devices and professional gear.
- • **Whisper-Quiet Cooling:** Smart fan and vent design keep your inverter cool and silent, so you stay focused on the road or work.
- • **Tesla-Compatible Voltage:** Upgraded 11-17V input supports Tesla & new energy vehicles—future-proof your mobile power setup.
- • **Advanced Safety Protections:** Built-in 40A fuse plus safeguards against overheating, over/under voltage, short circuits, and overloads.

## Overview

The BESTEK 300W Pure Sine Wave Power Inverter converts 12-17V DC to 110V AC with 300W continuous and 700W peak power. Featuring 2 AC outlets and 2 smart USB ports delivering up to 4.8A fast charging, it’s compatible with Tesla and other EVs. Its advanced cooling system and comprehensive safety protections ensure reliable, quiet operation for sensitive electronics on the go.

## Description

Buy BESTEK Pure Sine Wave Power Inverter, 300W DC 12-17V to 110V AC Car Adapter | Vehicle Plug in Cigarette Lighter Outlet Solar Inverter, 4.8A Dual USB Fast Charging Ports for Phone, Laptop, CPAP(Black): Power Inverters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Real Sine Waves at this price? 300 Watts? Believe it: It's True - 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? :)
Review: Sine me up - This is a good buy for a pure sine wave inverter. I needed something to power my electric blanket in a semi and the one I had kept faulting. This worked with my unit. I recommend

## Features

- BESTEK 300W Pure Sine Inverter (Patent Number US D818,853 S): 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
- 2*AC and 2*USB Fast Charging Ports: 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
- Upgraded Version Compatible with Tesla: Bestek power inverter upgraded to 11-17V, Compatible with Tesla and other new energy vehicle. 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
- Comprehensive Protection: 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07KQ4Q2L5 |
| Antenna Location | Vehicle |
| Best Sellers Rank | #4,288 in Automotive ( See Top 100 in Automotive ) #11 in Power Inverters |
| Brand | BESTEK |
| Built-In Media | 300W Power Inverter User Manual |
| Color | Black |
| Customer Reviews | 4.5 out of 5 stars 5,672 Reviews |
| Electrical Output Waveform | Pure Sine Wave |
| Energy Specifications Met | ETL, RoHS, FCC |
| Frequency | 60 hertz |
| Input Voltage | 12 volts |
| Inverter Capacity Volt-Amp | 462 |
| Item Dimensions L x W x H | 8.1"L x 5.3"W x 2.6"H |
| Item Weight | 1.4 pounds |
| Manufacturer | BESTEK |
| Mfr Part Number | MRZ3011HU |
| Model Name | MRZ3011HU |
| Model Number | MRZ3011HU |
| Number of Outlets | 4 |
| Output Power | 300 watts |
| Output Voltage | 120 volts |
| Peak Output Power Watts | 700 |
| Power Source | DC Powered |
| Recommended Uses For Product | Vehicle |
| Standby Power Shutoff | High |
| Unit Count | 1 Count |
| Voltage | 12 volts |
| Wattage | 300 watts |

## Product Details

- **Brand:** BESTEK
- **Model Name:** MRZ3011HU
- **Power Source:** DC Powered
- **Recommended Uses For Product:** Vehicle
- **Wattage:** 300 watts

## Images

![BESTEK Pure Sine Wave Power Inverter, 300W DC 12-17V to 110V AC Car Adapter | Vehicle Plug in Cigarette Lighter Outlet Solar Inverter, 4.8A Dual USB Fast Charging Ports for Phone, Laptop, CPAP(Black) - Image 1](https://m.media-amazon.com/images/I/71AoBMDAWsL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Can this unit support metrovac vacuum 120v - 60hz - 11.25amp?**
A: No, absolutely not. 120 volts at 11.25 amps is 1,350 watts, that's only 1,050 watts more than the 300 watts this unit is rated for.

**Q: how many amps can this handle safely for long periods of time? ( to anyone who knows or the seller) thank you!**
A: Rule of thumb for constant use and keeping things safe with as long as possible lifespan is about 66% of what it's designed for. This gives headroom to the voltage rails and tolerances. When electric components are used at their full capacity they heat up. So run at lower ratings to keep things cool without the fan having to overwork itself (which is just another potential failure point).

So for something rated at 300W I would try to keep continuous wattage at 200W. You're always going to have peaks and spikes, voltage drops and resistance, etc that will eat up the head room regardless so keeping continuous wattage usage lower at around 66% is ideal for pretty much all power supply needs including power amplifiers.

So whatever it is that you need to run constantly, take the continuous wattage and multiply it x1.5 and look for an inverter that has that continuous wattage rating to keep things longterm safe.

**Q: Does it automatically shut off if the battery drops bellow a voltage?**
A: The reason I am here today looking at reviews and deciding on a new inverter is because mine has stopped working after the battery dropped. I connected it to a different battery and it works for a couple of minutes and then 120V drops for a few seconds, in a repeating cycle. So my unit has failed after battery voltage ran out.

**Q: What is the length of the cord that plugs into the lighter outlet?**
A: Did the unit come WITH the cord, or do you have to purchase that separately?

## Customer Reviews

### ⭐⭐⭐⭐⭐ Real Sine Waves at this price? 300 Watts? Believe it: It's True
*by S***H 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? :)

### ⭐⭐⭐⭐⭐ Sine me up
*by N***Y on August 12, 2026*

This is a good buy for a pure sine wave inverter. I needed something to power my electric blanket in a semi and the one I had kept faulting. This worked with my unit. I recommend

### ⭐⭐⭐⭐⭐ Lots of inrush to get it started and then it is ok
*by E***E on March 29, 2026*

For what I plan on doing with this, it will work just fine. It is nice and compact and the fan is quiet. It will not work with my 4000 peak amp jump starters when I plug into the 12 volt 10 amp connector. Evidently, the internal electronics of the jump starters think the inrush current is an overload and shuts down. I ordered a couple of Milwaukee type 12 volt tool batteries with an adapter to connect to and wired it to the cigarettes connector and now it works fine. It would be nice if they could add circuitry to reduce the inrush current. The sine wave is very good. The frequency is right at 60 hertz and very clean and the voltage is at 111 VAC. Turn on the unit before plugging in anything to it. It take a second or two to stabilize.

## Frequently Bought Together

- BESTEK 300Watt Pure Sine Wave Power Inverter Car Adapter DC 12V to AC 110V with 4.2A Dual Smart USB Ports
- Goupchn SAE Power Socket Sidewall Port 2 Pack Weatherproof SAE Quick Connect Solar Panel Flush Mount Connector 2 Pin 12AWG with 8 Screws for Solar Generator Battery Charger
- 10 Gauge Fuse Holder - 10 AWG Inline Fuse Holder with 40 AMP ATC Blade Fuses (4pack)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-02*