Best 4000 Watt Inverter in 2022 (Reviews and Buying Guide)

By:Michael Johns

4000 watt inverter

Looking for a 4000 watt inverter?

Well, you’re in the right place.

When buying a 4000 watt power inverter it’s important to make the right choice.

They are sizable pieces of equipment that you’ll rely on to deliver your off-grid electricity supply.

Whether you’re in a truck, need a home emergency backup, or adventuring in an RV, your inverter is an essential item to run all your appliances.

But don’t worry.

Together we’ll take a look at everything you need to consider from what a 4000W inverter can run to the best 4000W inverter for your needs.

I’ve written all of this from my own first-hand experience with power inverters over the years. You can avoid all the mistakes I’ve made and get your electricity supply running smoothly.

In a hurry? Check the top picks…

What Can a 4000 Watt Inverter Run?

A 4000 watt inverter can run any appliance drawing up to about 3500 watts. It is important to note that a 4000W inverter can’t run a 4000W appliance. This is because inverters are not 100% efficient. You should always use an inverter with at least 20% more power than you want to draw.

4000W inverters are very powerful and will be able to run most home appliances and power tools. You could either run one single appliance up to 3500W or multiple electronics drawing up to 3500W.

This means you could easily run domestic appliances such as TVs, microwaves, refrigerators, computers, washing machines, freezers, fans, and lighting. Plus you could simultaneously charge smartphones, laptops, tablets, and digital cameras.

To give you a better idea of how many watts appliances use, I’ve put together a list of average wattage for common electronics:

Phone / Tablet5-10
Fan40 – 80
PS5 70 – 200
42 inch TV80 – 120
Computer100 – 200
Refrigerator300 – 500
Coffee Maker700 – 1500
Microwave700 – 1500
Toaster1000 – 1500
Washing Machine1200 – 2000
Dish Washer1500 – 2000
Circular Saw1200 – 1700
Compressor1000 – 2000

To find out the wattage of any appliance you should check the user manual or technical specification. I also recommend using a wattmeter which you can attach to any appliance to get a live power reading.

How Many Batteries for a 4000 Watt Inverter?

To use a 4000 watt inverter you will need at least 200Ah battery capacity, and probably a lot more.

This is because you are likely to be using a lot of energy to run your appliances. To work out how many batteries you need you can follow these steps:

  1. Find the amps/energy usage of any electronics by dividing the watts by battery voltage. Remember Watt ÷ Volt = Amp. 

For example, let’s say you draw 3000W from a 12V battery. That would use 250A. 

Drawing 3000W from a 12V battery uses amps of energy an hour!

  1. Multiply the amps drawn by the hours you want to run. 

250A x 3 hours = 750A.

So if I want to draw 250A for 3 hours you need 750Ah battery capacity. 

How Many Amps Does a 4000 Watt Inverter Draw?

A 4000 watt inverter can draw up to 333 amps from a 12V battery and 166 amps from a 24V battery.

To work out the amps your appliances will use with a 4000W inverter you just need to divide the appliance wattage by battery voltage.

Watts ÷ Volts = Amps.

So 4000W ÷ 12V = 333A

Just remember, you won’t always draw 4000W from your inverter. It is your appliances that decide the wattage. For example, a microwave might only draw 1200W from your inverter. Just use the formula above to find the maximum amp draw of any appliance.

Best 4000 Watt Inverter Reviews

Now you have an understanding of what you can run with a 4000W inverter, you’ll know if it’s the right product for you. Let’s take a look at the best 4000 watt inverters available today. I’ve written an in-depth review of the top options taking into account performance, quality, and features.

Cantonape Pure Sine Wave 4000W Power Inverter

Kicking off this list is a real all-rounder that’s perfect for most leisure uses in trucks, RVs, and boats.

What you’ll be getting here is a high-quality pure sine wave inverter 4000 watts continuous and 8000 watts peak power. It should give you more than enough energy to fire up even the biggest appliances.

4 AC outlets make it effortless to plug in multiple devices while also being able to charge a phone from the USB port. In addition, you get a wireless remote control to flick the power on and off at will.

It’s a no-fuss inverter that gets the job done. You can easily keep an eye on the input and output voltage via the dual screens so you know everything is working efficiently.

This unit will last you for years with a durable aluminum housing that maximizes heat dispersion along with smart cooling fans. Of course, you get all the essential safety features to guard you against voltage fluctuation, overloading, overheating, and short-circuiting.

A reliable and high-performing pure sine wave inverter!


  • Pure Sine Wave
  • 8000W peak
  • 4 AC outlets
  • Aluminum housing
  • Dual screens
  • Wireless remote


  • Only 1 USB

Energizer 4000 Watts Modified Sine Wave Inverter

Looking for the best 4000W modified sine wave inverter? Then the team at Energizer has you covered. You’ve probably used Energizer’s AA batteries, but they also deliver a solid range of power inverters.

This gives you a nice balance of power and an attractive price point. Plus it’s a reputable brand name which is always a comforting sign.

Nevertheless, you still get all the key features to make using it a complete joy. 4000 watts with 8000 watts peak means you can happily run things like heaters and kettle, along with other simple non-inductive loads. Remember, without pure sine wave, don’t expect to run microwaves, fridges, and tools efficiently with this unit.

2 three-pin AC plug points and 2 USB ports mean you have a nice versatile between appliances and recharging your gadgets. 

The 2 year warranty is an added bonus so you know it’s a well made product that will last. In addition, it arrives ready to go with the correct battery cables and safety features. And once you’re up and running you can monitor everything on the crisp LCD screen.


  • 8000W peak power
  • 2 AC and 2 USB
  • Ready to use
  • Trusted brand
  • 2 year warranty
  • LCD screen


  • Modified sine wave
  • Could have more durable shell
  • No remote

WZRELB Pure Sine Wave 4000W Power Inverter

This WZRLEB inverter delivers a sleek modern design and is packed with everything you need to convert 12V DC into 120V AC from your battery and solar panel system.

One of the great things about WZRLEB inverter is the range of size and voltages you can pick from. While we’re looking at a 12V option here, you could also move to a 24V input if required for your battery supply.

In terms of performance and features, it doesn’t disappoint. 2 AC outlets mean you can quickly fire up your essential appliances. This start up phase is also covered by a 8000 watt peak power capacity. The extra thick PCB board internally gives ample load capacity too.

Run any inductive appliances, like refrigerators and ACs, thanks to the pure sine wave output. Plus monitor input and output voltage on the clear LCD screen.

The only real reason it doesn’t rank higher is the lack of USB and a slightly questionable user manual.


  • Pure sine wave
  • Nice design
  • Multiple size/voltage options
  • No-fuss


  • No USB
  • No Remote
  • Poor instructions manual

AIMS 4000 Watt Pure Sine Inverter Charger

Time to kick things up another gear with this epic inverter charger from AIMS.

This is everything you need to accompany your battery setup with a hugely powerful inverter and in-built battery charger.

Of course, you’re getting 4000W continuous output but you also get a staggering 12000W peak power. You should never have any trouble switching on your electronics.

To be honest, this is best suited for bigger leisure and work vehicles like boats, food trucks, and semi-trucks. Or even as a home backup for things like sump pumps. The hardwire terminal means you can wire up a full electrical system to run pure sine wave power where you need.

The 115A battery charger can handle large battery capacities connected in parallel whether it’s lead-acid or lithium. For a complete hands off experience, the automatic transfer switch draws mains AC power until you’re disconnected and requires battery power. Perfect for boats or emergency backup.

This beast is fully protected from overload, overheating, voltage fluctuations, short circuits. Plus there’s an eco-mode to save your energy when idle.

A kickass inverter charger to run your life.


  • Pure sine wave
  • 12000W peak
  • 115A charger
  • Eco-mode
  • Automatic transfer switch


  • Expensive
  • Heavy
  • Only hardwire ports
  • No screen

PowerBright 4000 Watts Power Inverter

For a reliable yet affordable unit, take a look at the PowerBright.

This piece of equipment will keep the lights running when there’s no mains electricity supply. It’s commonly used as a backup during a power outage or in vehicles like RVs.

It is a modified sine wave which means there’s limits to what you can run. You will still be able to power simple electronics, heating devices, and charge your essentials. Although you might struggle with refrigerators, motors, and sensitive devices like LED TVs.

You get a solid inverter with everything you need including 2 AC outlets, in-built mounting system, and clear digital display. In addition, 2 USB ports keep your smartphone and tablet fully charged.

You’ll find nothing too complicated here. Once it arrives you can hook it up to your battery and crack on. Adding to this, all the requisite safety protections are included for your peace of mind.

A solid modified sine wave inverter to keep your essentials running.


  • 2 AC and 2 USB
  • Digital display
  • Easy to use
  • Ready to go


  • Modified sine wave
  • No remote

SUNGOLDPOWER 4000W Inverter Charger

Let’s finish things up with another inverter charger that also offers split-phase choices.

It doesn’t quite pack the same charging power as the AIMS unit above, with 65A charging capacity. You still get a serious inverter with 4000W continuous and 12000W peak power. Plus a hardwire terminal enables you to hook up to a full electrical system with an automatic transfer switch. It automatically charges the batteries and runs mains electricity until this disappears. During an outage or disconnection, you’ll then instantly move to battery energy.

To be honest, as an inverter it’s got all the essentials, although don’t expect USB ports, three-pin AC or a screen. This is for bigger electrical systems in boats, solar, or at home.

The real point of difference is the split-phase choices and being able to switch between 120V and 240V output. Adding to this, you can buy it in a 12V, 24V, or 48V input for great flexibility. 


  • Pure sine wave
  • 65A charger
  • Split-phase
  • Multiple voltage choices to buy
  • Automatic transfer switch


  • Expensive
  • No screen
  • Hardwire terminal only

4000 Watt Inverter Factors and Considerations

Still a little confused about which power inverter to buy? 

Let’s go through the key considerations when choosing your equipment. 

Pure vs Modified Sine Wave

There are two types of power inverters available that have slightly different electrical outputs. Pure or modified sine wave.

In my opinion, it’s always worth going for a pure sine wave inverter as you can run any appliance.

Pure sine wave is the better option as the current more closely replicates what you get from the main grid. It delivers a smooth flow of electricity which means you are not restricted in what appliances you can run. For example, it enables you to power sensitive electrics like medical equipment, AC motors like power tools, and inductive loads like refrigerators.

Modified sine wave inverters are cheaper but can’t run sensitive electronics, motors, and other inductive loads. You will be able to run simple things like lighting, old TVs, heaters, toasters, hair dryers, crock pots. Plus charge portable gadgets. Due to the sharp steps in voltage you get more harmonic distortion which interrupts radio signals too.

You can read more about the differences here. 


You should also work out what appliances you want to run, plus how you will connect them to the inverter.

For example, do you want to plug directly into the inverter? For this you’ll need 3-pin AC outlets on the unit. Plus you might also want a USB port to charge a smartphone.

Or will you hardwire your inverter to an electrical system? This is best done with a hardwire terminal which is usually found on heavy duty equipment with functions like automatic transfer switches.

Ease of Use

How technically minded are you? 

For some of us, the need to hardwire everything or select frequencies is too much to worry about. There are plenty of user friendly products available which are quick and easy to hook up. In addition, you can get helpful features like digital screens and wireless remote controls.

Make sure you find an inverter that you can easily run without needing a professional every time you want to make an alteration.

Size and Weight

Remember, 4000 watt inverters will be big and heavy. There’s no real way around it! 

I suggest you plan accordingly. Work out where you plan to mount it and check the dimensions of your unit.

This is especially true with inverter chargers which are even heavier as they contain many more components. In fact, you might find they can weigh over 40lbs.


It seems like inverters get more bells and whistles every day. Depending on how you use your equipment, some might be more useful than others. Here’s a list of features you can consider:

  • Digital screen
  • Remote control
  • Wireless charging
  • USB
  • Fast charging
  • Bluetooth
  • Alarms
  • Charging function
  • Transfer switch
  • Frequency adjustment
  • Eco-mode


One thing you should never compromise on is safety. All of the inverters discussed in this article have the highest level of protection to keep you and your appliances safe. If something goes wrong with these electrical systems the results can be devastating.

You should ensure your equipment has guards against short-circuit, overvoltage, undervoltage, overloading, and overheating.

While your inverter should have in-built fuses, many people also add an in-line fuse separately to protect the cables between the battery and the inverter.


So how much does a 4000W inverter cost?

Well, these are serious pieces of kit! You can expect to pay between $350 and $1000+. The price will very much reflect what you are getting. For instance, you can pick up a modified sine wave 4000W inverter for just over $350. Whereas a 4000W inverter charger will cost you nearer to $1000.

If you see anything cheaper than this scale then double check the quality of what you are getting. The last thing you want is a sub par product that doesn’t deliver what you need.

FAQ on 4000W Power Inverters

Can I run 4000 watt inverter from cig plug?

No, you can’t run a 4000 watt inverter from your cigarette lighter plug in a car. This is because these 12V outlets can only output 150 watts. So you’d struggle to do anything more than switch the inverter on. You will need to connect directly to a battery.

Can my car keep a 4000 watt inverter running?

In theory, you can hook your inverter up directly to your car battery in order to draw power. You should check the charging capacity of your alternator before doing this. If you try to draw a full load of 4000 watts you are likely to use more energy than your alternator can replace and eventually deplete your car battery. Remember, to always keep your vehicle engine running while using an inverter so the starter battery can be recharged.

4000 Watt Power Inverter Summary

By now you should be an expert at looking at a 4000 watt power inverter.

These are high powered pieces of equipment that can be used in a number of different scenarios.

If you’re looking for an inverter to use in a boat or as an emergency power backup then an inverter charger with a transfer switch is the best option. 

On the other hand, you can easily use a regular inverter in an RV and have no restrictions if you go for a pure sine wave unit.

Whatever you need, you can choose from the 4000W inverters above with confidence.

For more options read my in-depth guides to the Best 3000 Watt Power Inverter and Best 5000 Watt Power Inverter.

Thanks for reading.