The Best 300 Watt Power Inverter

Power inverters help turn car batteries into instant sources of power for household appliances. They work by converting direct current (DC) electricity into alternating current (AC) electricity. Power inverters can power a variety of household appliances depending on their capacity. Wattage varies from 150 watts to 3000 watts or more.

The 300 watt variant sits on the lower end of the spectrum. We will review five different 300 watt power inverters before giving our best pick. Additionally, we will cover what size power inverter you should select and which devices a 300 watt inverter can power.

COMPARISON CHART

IMAGE PRODUCT
BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter (Black) BESTEK 300W Power Inverter
  • Multi-protection
  • Wicked fast 4.2A USB ports
  • Compact size
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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone Maxboost 300W Power Inverter
  • Equipped with several protections
  • Smart port USBs
  • One year limited warranty
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Go Power! GP-SW300-12 300-Watt Pure Sine Wave Inverter Go Power! 300 Watt Power Inverter
  • Pure sine wave power
  • Two year warranty
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Foval Power Inverter 300W DC 12V to 110V AC Converter with 4.2A Dual USB Car Charger Foval 300 Watt Power Inverter
  • Least expensive option
  • 24/7 Customer support
  • Fuses for added protection
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Power Inverter 300W Car Inverter DC 12V to 110V AC Converter with LED Display & 4.8A Dual USB Car Adapter Charger by VOLTWORKS Voltworks 300 Watt Power
  • 600 watt power surge protection
  • 18 month warranty
  • Multi-protection
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BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter (Black)

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BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter (Black)

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BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter (Black)

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BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter (Black)

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BESTEK 300W Power Inverter DC 12V to 110V AC Car Inverter with 4.2A Dual USB Car Adapter (Black)

WHAT WE LIKE

Named Amazon’s choice, the Bestek 300 watt power inverter offers plenty of usage potential in a small, portable package. It promises 300 watts of continuous power with a very large 700 watt instantaneous power surge capability. This allows for protection during extraordinary power draws which may occur during usage.

With two 4.2A USB ports and two 110 volt AC outlets, this power inverter can handle up to four devices simultaneously. The 4.2A rating on the USB ports allows for fast charging on most devices, a feature sure to make this power inverter appeal for its intended vehicle use. The Bestek draws its power only from a 24 inch cigarette power port cable and lacks the battery clip cables of higher wattage inverters.

About the same size as a smartphone except much thicker, this power inverter can fit excellently in the limited space offered by most car interiors. It barely weighs more than a pound, making it incredibly portable when combined with its small size. It features protection from overheating, under/over voltage and short circuiting. 

Retailing at $29.99, the Bestek 300 watt power inverter comes right in line with other options at this power level.

PROS

  • Multi-protection
  • Wicked fast 4.2A USB ports
  • Compact size
  • Lightweight
  • 18 month warranty

CONS

  • No battery cable
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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone

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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone

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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone

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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone

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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone

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Maxboost 300W Power Inverter Dual 110V AC Outlet and 2.4A/24W USB Car Charger [Aluminum & PC Body] DC 12V to 110V AC + DC 5V USB Battery Charger Compatible with Laptop,iPhone,Tablet,Other Smartphone

WHAT WE LIKE

Much like the Bestek, the Maxboost 300 watt power inverter also earns the title of Amazon’s Choice. It delivers 300 watts of continuous AC power, and features a 700 watt instantaneous power surge level. This power level allows it to handle devices such as lights and smartphone chargers.

You can tap into its power supply from two 2.4A USB ports and two 110 volt AC outlets. This means that you can plug up to four devices into it simultaneously. The USB ports come with smart chips which detect the proper power levels of the input device and adjust accordingly up to 2.4 amps. Like most 300 watt power inverters priced less than $50, the Maxboost draws power only from a cigarette lighter plug with a 24 inch cable. 

Designed with portability and safety in mind, you can easily store this device in most cars without taking up too much space. It weighs one pound with dimensions of 4.7 x 3 x 1.7 inches. It also comes with protections from overheating, over/under voltage, overloads, overcharging and short circuiting.

The Maxboost retails at $39.99 MSRP, but frequently goes on sale for closer to $30.

PROS

  • Equipped with several protections
  • Smart port USBs
  • One year limited warranty
  • 700 watt power surge protection

CONS

  • 2.4A USB not capable of fast charging all devices
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Go Power! GP-SW300-12 300-Watt Pure Sine Wave Inverter

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Go Power! GP-SW300-12 300-Watt Pure Sine Wave Inverter

WHAT WE LIKE

As a pure sine wave inverter, this Go Power! model can handle any appliance so long as it does not exceed the 300 watt continuous power limit. It features a 450 watt power surge limit to protect devices from an unexpected surge. 

It comes with two GFCI protected power outlets and no USB ports. The Go Power! inverter weighs significantly more than the other options on our list at 7.7 pounds. It also has the largest dimensions at 11.75 x 8 x 5 options. Its large size makes it more of an outdoor inverter, coupled with the fact that it does not include a cigarette port cable and only draws power from a battery cable. 

It features several safety measures including over/under voltage and overload protection. Should any of the safety measures fail, Go Power! protects customers with a two year warranty with each new unit.

Not only does this power inverter weigh a lot more than the other options on our list, it also costs more. It retails for around $130 on most online markets, depending on its availability. Refurbished units also cost around the same amount.

PROS

  • Pure sine wave power
  • Two year warranty

CONS

  • Expensive
  • Not very portable
  • No cigarette port plug cable
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Foval Power Inverter 300W DC 12V to 110V AC Converter with 4.2A Dual USB Car Charger

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Foval Power Inverter 300W DC 12V to 110V AC Converter with 4.2A Dual USB Car Charger

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Foval Power Inverter 300W DC 12V to 110V AC Converter with 4.2A Dual USB Car Charger

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Foval Power Inverter 300W DC 12V to 110V AC Converter with 4.2A Dual USB Car Charger

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Foval Power Inverter 300W DC 12V to 110V AC Converter with 4.2A Dual USB Car Charger

WHAT WE LIKE

The Foval 300 watt power inverter features two 2.1A USB ports and two 110 volt power outlets. A return to the portable vehicle focused power inverters such as the Bestek and the Maxboost, it weighs just over a pound and comes in with dimensions of 5.1 x 3.1 x 1.7 inches. 

Also like the first two options, it only features a cigarette plug port cable and not a direct battery connection cable. These 300 watt power inverters have a clear focus on in-vehicle use since their lower wattage limits their use. They work best for charging cell phones, certain laptops and powering other small appliances. For the larger appliances which would require use outside of a vehicle, a higher wattage inverter would make more sense.

The Foval comes with all of the expected safety features including overheating, over/under voltage, short circuiting, overload and overcharging protection. Additionally, Foval backs this product with 24/7 customer support. 

Retailing at $23.98, the foval is the cheapest option on our list. For that slightly lower price you receive a wonderful power inverter. It comes with a 30 inch power cable, which is actually the longest cigarette port cable on our list.

PROS

  • Least expensive option
  • 24/7 Customer support
  • Fuses for added protection
  • Longer cigarette port cable

CONS

  • Low power USB ports
  • No battery cable
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Power Inverter 300W Car Inverter DC 12V to 110V AC Converter with LED Display & 4.8A Dual USB Car Adapter Charger by VOLTWORKS

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Power Inverter 300W Car Inverter DC 12V to 110V AC Converter with LED Display & 4.8A Dual USB Car Adapter Charger by VOLTWORKS

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Power Inverter 300W Car Inverter DC 12V to 110V AC Converter with LED Display & 4.8A Dual USB Car Adapter Charger by VOLTWORKS

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Power Inverter 300W Car Inverter DC 12V to 110V AC Converter with LED Display & 4.8A Dual USB Car Adapter Charger by VOLTWORKS

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Power Inverter 300W Car Inverter DC 12V to 110V AC Converter with LED Display & 4.8A Dual USB Car Adapter Charger by VOLTWORKS

WHAT WE LIKE

The third and final option on our list labeled “Amazon’s Choice,” the Voltworks inverter offers 300 watts of continuous power with a 600 watt protection surge limit. This allows it to power many household appliances without cause for concern.

It features two 120 volt outlets and two 2.4A USB ports, it can handle up to four inputs simultaneously. These USB ports offer mild fast charging capabilities on a few devices. Safety measures include insulated input and output, over/under voltage, short circuit, overheating and overload protections.

The Voltworks power inverter draws power from a cigarette lighter port cable. At two feet long, you can find a comfortable place for it in your vehicle. Its small size and weight add to the portability factor. Weighing only 1.08 pounds, it comes right in line with most of our other options.

In terms of pricing, it retails for $27.99 which is also right in line with our other options.

PROS

  • 600 watt power surge protection
  • 18 month warranty
  • Multi-protection
  • Compact and Portable

CONS

  • Cooling fan may get loud
  • USB ports do not support fast charging on all devices

Frequently Asked Question

What Size Inverter Should I buy?

As mentioned way above, power inverters range from 150 watts all the way to 3000 watts or more. This huge range of power capabilities can make it confusing when it comes to selecting a size. In general, you should choose a power inverter which can handle your intended use. 

300 watt inverters should be the lowest wattage devices you consider. They usually only cost slightly more than 200 watt and 150 watt inverters, but give you a greater range of versatility. For instance, you can handle small laptop chargers and several cell phones at once with a 300 watt inverter with relative east. This power load would push the limits of a smaller inverter.

For heavier duty jobs, pick a higher load inverter. Be advised that larger inverters draw more power from car batteries even when not in use.

What Will a 300 Watt Inverter Run?

Power inverters of all kinds can power many household appliances. Cell phone chargers make up the most common use of power inverters. Televisions, lights and other small gadgets also draw power without a hitch from 300 watt inverters. Pure sine wave inverters can handle much more devices, since they convert DC to AC in a more pure form.

So long as the total wattage drawn from a 300 watt inverter does not exceed 300 watts (with the exception of any momentary surge limit), your inverter will handle it without a problem.

Final Recommendation

Overall, the BESTEK 300W Power Inverter takes our pick as the best 300 watt power inverter. It comes with all the features you need from a power inverter at a reasonable price. Its 4.2A USB ports give it the added benefit of near universal fast charging. This unique aspect sets it apart from the other similar options.

For more information on power inverters, check out some more of our blog posts. 

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