Best Power Inverters Reviews 2021

Best Power Inverter

If you're in the market for a power inverter? If you don't know what one is and are just curious, then this review to help you choose the best power inverters at an excellent starting point.

The big question, before I get started, is what a power inverter is? In the simplest explanation, a power inverter is a tool that changes DC (direct current) power to AC (alternating current) power.

The most common DC power source today is your automobile inverters. DC power generally comes from a battery source. That is pumping directly into a device.

AC power is usually what home wiring is. So that means using a high-efficiency inverter is most likely going to be done while you're in the car, and need a device that is usually plugged in at home.

While there are other instances where a reliable inverter is useful. The best power inverter for cars is specifically designed for car battery. They can be used to power almost any home product while on the road, and many are now including USB ports to recharge cellular and other wireless devices.

Top 10 Best Power Inverter Brands and Model

How To Choose A Power Inverter

There are some essential things to consider before selecting the best inverter. So before I take a look at some of the best ones out there. Here are things to keep in mind:

1. What Type Of Inverter Is Needed?

Depending on whether you’re planning to use the device on the road or as a backup power supply for the home, then that determines what type you’ll need.

If you need to power your devices in an RV, car, or boat, then you’ll want a cheap rv power inverter and charger. If you are setting up a power supply back up for the home, then you’ll be best suited with an rv inverter/charger.

2. What Size Of Inverter Is Needed?

The next thing to consider is how much power the inverter will be able to supply. Inverters range from only being able to power one or two devices at once, up to running an entire household.

The best way to know what size of inverter you need is to look at the wattage rating for each device or appliance that will be plugged in. Add that wattage together to get the total that needs to be supplied.

Leaving yourself some head room is advisable too, as it’s best to be able to cover a little bit more, rather than not being able to get what you need to run.

3. What Should Be The Input Voltage?

The amount of power that can be dished out by the inverter is limited by the voltage that is supplied through it. If you’re running it off of a car, then the power is likely coming from either a 12 volt or 24-volt battery.

If the voltage of the battery can’t provide the inverter with enough ability to run what you need, then you may have to scale it down and run fewer devices.

4. Modified Sine Wave Inverter vs Pure Sine Wave Inverter

With power inverters, they process the power as a wave in one of two ways, either as a True Sine Wave or as a Modified Sine Wave. A pure sine wave inverter will offer more consistent power, with fewer interruptions or surges.

If you are using more precision type devices that need the power level to stay the same throughout usage. Then going with a pure sine wave inverter is the better option.

Modified sine inverter are cheaper, and still provide efficient power, but they are less consistent than pure sine wave types, so more professional-grade equipment may not work adequately with them.

Recommended Top Rated Power Inverters 

Below are some of the inverters we reviewed that I felt were the best available on the market:

  • BESTEK 2000W Power Inverter: Best Inverter for Charging Power Tools
  • UFire 3000W Power Inverter: Best Power Inverter for Rv
  • POTEK 5000W Power Inverter: Best Marine Power Inverter
  • AIMS Power 1500 WATT Pure SINE Inverter: Best Power Inverter for Solar
  • BESTEK 300W Power Inverter: Best Car Power Inverter
  • ENERGIZER 500W Power Inverter: Best Power Inverter for Work Truck
  • The 6 Best Power Inverters Reviews in 2021

    1. BESTEK 2000W Power Inverter

    Power Inverter

    One of the more powerful models, this model is capable of handling power demanding devices. Fully capable of keeping on refrigerators, footlights and all of your small appliances, this unit is as versatile as can be.

    This unit loaded with six 50 amp fuses, this unit protects all of your devices from surge power or overload protection. While this unit set up to be usable in a car, the only power ports are the three 110 volt outlets. This unit fitted with a massive cooling fan, this unit is louder than many of the other entries while it runs. 

    It also needs to be kept out of sunlight, or away from heat-producing devices as it can become overheated. It comes with both a cigarette lighter and alligator clamps, but running it on the cigarette lighter limited the unit from delivering at full power.

    This device should only be used with a 12v dc power supply. This unit designed for assisting with larger appliances and heavier loads, not the best choice for travel or use on the road.



    • Very high output
    • Six 50 amp fuses for better protection
    • Includes both cigarette lighter plug and alligator clips
    • Versatile uses for appliances and devices
    • Can overheat easily

    2. UFire 3000 Watt Inverter

    Power Inverter

    Providing up to 3000 watts of continuous power, and 6000 watts maximum, this is great for home usage when the power goes out or when temporary power needed on a job site. This unit is connected directly to the battery, and it does not have a cigarette lighter adapter as the power is too high for that type of usage.

    Built with 12 fuses, each at 35 amps, this unit will protect whatever may be plugged into it from overload. Along with that, there are multiple forms of protection built into the unit, keeping it safe from taking damage as well.

    It built with only two 110 volt outlets, and it’s limited on how many devices can use at one time. Only for use with a 12-volt power supply. The device has two LED displays that low voltage from the battery and how much voltage output is going through the device while in use.



    • 3,000 watt constant output voltage can operate nearly any appliance
    • 12 fuses, 35 amp each, for protection
    • LED input and output wattage displays
    • 6,000 watt peak power
    • Only two outlets
    • Must be wired to battery

    3. POTEK 5000W Power Inverter

    Power Inverter

    This 5000-watt unit has four 110 volt outlets and two USB ports. With 5000 watts of continuous power, overloading this device is unlikely, even if all power ports are in use at the same time.

    This unit is not for use while operating a vehicle. Its primary purpose is for worksites, power inverter for camping, solar power inversion for use in homes, and similar applications. Being as powerful as it is, the draw from the battery is so great that a reliable connection must be created with the battery terminals to prevent the risk of fire. 

    The unit comes with three wires for each the positive and the negative, along with a ground wire to reduce that fire risk. It is built with a smart cooling fan that only begins to operate when the temperature of the unit reaches 104 degrees Fahrenheit.

    One drawback to the continuous power provided by this unit is that it serves as a modified sine wave device, so the stability of the current may not be as strong as desired.



    • 5,000 watt output
    • Smart cooling fan
    • Multiple cables per post to reduce fire risk
    • Four 110V outlets
    • Two USB ports
    • High accelerometer voltage output but built as a Modified Sine Wave device

    4. AIMS Power 1500 WATT Pure SINE Inverter

    Power Inverter

    This unit providing 1500 watts of continuous power, this unit made to operate based on a pure, or true sine wave. This is the most efficient inverter available, as they keep the power flow in line almost entirely. Along with that, this unit can surge to 4500 watts for its maximum power output.

    Unfortunately, it can only manage that for 20 seconds at a time, but it is a massive boost of power. The automatic generator start capability of this unit helps ensure that if the battery level is dropping too low that it can trigger an attached generator to start.

    When that generator turned on, it is used to recharge the battery. As well as maintain the level of power output you need for your home, work-site or while you’re camping.

    This is especially useful in conjunction with the built-in 50 amp inverter battery charger, so it can recharge the batteries as well as invert the power from them.

    The downfalls of this unit for home use are that it only has two 110 volt ac outlet, no USB connections, and it is more limited on the power sources it can run off of. This cannot be used directly from solar panels.



    • 1,500 watt continuous power, 4,500 max output
    • True sine wave device
    • Automatic generator start capability
    • 50 amp battery charger with 8 settings
    • Only two output sources, both 110 volt outlets
    • Not suitable for many common inverter uses

    5. BESTEK 300W Power Inverter

    Power Inverter

    Bestek built this 300-watt inverter with two standard 110 volt AC plugins and two USB ports as well. It provides top speed charging so that devices you plugin will be charged as fast as capable. This unit is compact, making it a natural addition to the vehicle for road trips, camping or addition to an emergency kit.

    Bestek power inverter plugs into the car via the cigarette lighter by a 24 inch (two-foot) cord. With multiple forms of protection, the device prevents overheating, short-circuiting, overcharging and overloads. 

    This protects any device being plugged into it from damage, as well as prevents damage to the car or inverter while in use as well. This inverter is for 12-volt battery use only. Twenty-four-volt power supplies may damage the unit, and as such, it should not be used on aeroplanes or in vehicles with the larger battery.

    It’s also best to ensure the inverter has switched off before turning off the car. Turning the car on while the unit is set to the on a position can cause too much surge through the inverter.



    • Two of each, 110V outlets and small usb port
    • Long cord
    • USB ports work without remote switch unit on
    • Multiple forms of protection
    • Compact design
    • Continuous fan while switched on

    6. ENERGIZER 500W Power Inverter

    500W Power Inverter

    Being a 500 watt inverter means having more power to run more devices at the same time. This unit is built with two 110 volt outlets and four USB ports.

    It also has a built in mounting post that allows for it to be installed permanently into a vehicle. It can be plugged into the cigarette lighter socket or it comes with alligator clips to attach directly to the battery cables.

    Intertek, the multinational product testing and certification company, certified this device for performance and safety. It protects against overload, overheating and short circuit protection.

    It’s verified to run at 500 watts continuously with max output peaks at 1,000 watts. It’s set for an input voltage of 12 volts, so it works great in most cars but it’s not for use with 24 volt battery systems. 

    The unit is built with a very quiet fan, listed as a thermal-fan, which keeps the unit cool but doesn’t become annoying as it runs. The power output is set to 110-120 volts.



    • Four USB ports and two 110V outlets
    • Quiet thermal-fan
    • Max output can reach 1,000 watts
    • Alligator clips to connect direct to battery
    • Can be permanently mounted
    • Has been known to operate at less than optimal levels after a few months

    Advantages Of Using A Power Inverter

    The most obvious reason for using a high power inverter is that you never run out of power for your devices, as long as the battery it operates from can be recharged. This works great in cars, as the battery in a car charges while the engine is running.

    Most of the inverters you’ll encounter are designed to be able to operate from a car’s battery through the cigarette lighter or by direct connection to the battery terminals. One of the biggest reasons to have an square wave inverter is if you live in an area where power outages are frequent.

    If the source of power to your home, or place of business, is unstable, then inverters keep those spaces protected by ensuring that the power never fails. No longer having to worry about the refrigerator suddenly being disconnected from a power source for hours at a time makes sure you don’t lose food or other valuable resources.

    Portable power inverters run with no additional cost after purchase. They are a cost-effective way to maintain power, or operate the devices you need while you are travelling, without consuming more energy than what is fed into it.

    How To Safely Operate A Power Inverter

    There are some important things to pay attention to while operating a overland power inverter charger, as they can cause damage or be harmful if left unattended.

    • Pay attention to the temperature. Power inverters get hot. They can easily overheat, if not built with protection against this. The more powerful the inverter, the hotter it can get. In some cases, a failing inverter can catch fire, or become hot enough to catch surrounding materials on fire. When using a inverter charger, make sure it’s setup in an area where it can’t react with flammable materials, and check it frequently for overheating.
    • Only purchase inverters made from fire resistant materials. In a continuation of the safety point above, never buy or use an inverter that is made from materials that are not fire resistant. If the materials the inverter is made from can catch fire, then that opens the door for disaster.
    • Ensure your devices are safe to plug into the inverter. Many devices are not built for the power flow of an inverter. If a device, such as a cell phone, tablet or computer that is plugged into an inverter gives a warning status, immediately unplug it from the inverter.
    • Always follow the operator instructions. 110 volts can be deadly or cause permanent injury to a person. Power inverters used inappropriately or in a dangerous manner can seriously harm you, so always follow the included manual. Never remove the cover of an inverter while it’s in use.
    • Never mount an inverter into the engine compartment. While it may seem like an easy way to keep an inverter attached to the battery, mounting it under the hood is dangerous. Oil, acid, grease, water and other harmful materials can get to the inverter in the engine compartment. If any of those substances damages the inverter it can cause serious damage to the car or the battery.
    • Keep the inverter protected from the elements. Along with the concept that being under the hood is bad, so is being exposed outside in inclement weather. Rain or snow can cause serious damage to these units, so they must always be protected from water.
    • Ensure good airflow can reach the inverter. While it’s important to keep the inverter safe from the elements, it will still need good airflow to it. The fan and body need air to keep the inverter cool and running at the right temperature. Enclosing the unit, or positioning it where airflow is restricted will lead to overheating.
    • Beware of causing “Islanding". Islanding is when the inverter is capable of returning power into the power lines, or grid, when the power to the grid is down. This can send a charge down the power line, unknown by workers that may be repairing it nearby. This puts those workers in danger as they could be subject to electrical shock from your device.


    Now that I’ve gone over some of the important things to know about power inverters, and with the reviews of some of the best power inverter brand available, it’s time to make a verdict. This is based on my own opinion and what I would use a power inverter for.

    So your needs may be vastly different from mine. Be sure to check out all of the devices listed here to make sure you’re getting what you need and want.

    Leave a Comment: