Skip to content

KRIEGER 4000 Watt Inverter Review – 12 Volts Modified Sinewave

krieger solar inverter

Whether you are camping, traveling, or simply driving, there is no doubt that you’d want your electrical conveniences powered and ready for use. This is why you need a power inverter so that you can power them while in your car. The Krieger 4000 Watt Inverter, one of the best 4000 watt modified sine wave inverters available in the market, is a heavy-duty, portable 4000 Watt power inverter capable of powering the most demanding loads efficiently and provides back-up automotive power supply. If you want to power a microwave oven, a TV, a laptop, or any other similar electronic devices and home appliances, this inverter can do so smoothly. With this inverter, you have power on the go for your cars, trucks, boats, or RVs.


Although pure sine wave inverters are a more preferred choice due to their ability to produce clean power and run your electrical conveniences smoothly, the modified sine wave inverter can also be an excellent cost-effective choice for you especially if you do not have too much load to run. This inverter type is perfect for running equipment that runs on non-sinusoidal currents such as your electric heaters and bulbs. The major advantage of purchasing this inverter type is that it is less expensive than the pure sine wave inverters and they run simple systems efficiently. If your equipment your inverter will run well on a modified sine wave current, you may as well save money and purchase this inverter type.


  • Model: KR-4000
  • Color: Black
  • Weight: 16 pounds
  • Product Dimensions: 20.2 x 9.8 x 8.3 inches
  • Continuous output power: 4000 Watts
  • Surge power capability [peak power]: 8000 Watts
  • Output Wave Form: Modified Sine Wave
  • DC Input Voltage: 12V
  • Input Voltage Range: 10.5V – 15.5V
  • AC Output voltage: 115V
  • AC Output Voltage Range: 110V – 120 V
  • Rated Output USB: 2 * 5V/max 2.1A (iPad)
  • Cooling System: Thermostatically Controlled Fan.
  • METLAB approved to UL and CSA standards.

The Krieger KR-4000W Inverter package includes these items: KR-4000W Power Inverter and an installation kit which include: a 3ft. two gauge AWG battery cables, remote switch with a 20ft cable, in-line ANL fuse kit, and user manual.

Features of the Krieger 4000 Watt Inverter

Power Rating

With 4,000 watts of continuous power, this inverter is guaranteed to run any of your appliances and equipment within its wattage range as long as the load is not greater than 4000 Watts. It also has a surge capability of 8000W which helps to kick-start those appliances such as your microwave that require a large amount of power on startup. You need to check the maximum continuous and surge rating of your device before purchasing this inverter. Do not purchase this inverter if the power rating of your device exceeds the power rating of this inverter.

Dual 3-prong 120V Standard North American AC Outlets 

These outlets are the “Type B” North American NEMA 5-15 standard. They supply 120VAC to your appliances. If your appliances do not match the shape of these sockets, you will need a travel plug adapter in order to plug in. However, they are not GCFI protected like the pure sine wave inverters.

5V/max, 2.1A (iPad) shared Dual USB Ports

This inverter features two 5VDC, 2.1A (iPad) USB port. This allows you to power one or two single 2.1A-compatible tablet devices or two 1A USB-charging devices, such as your cellphones while on the go.

Built-In Digital Display 

It provides you with useful information that helps you monitor the status of the inverter while in operation. You will be able to know when the battery is in need of recharging, its input voltage, output power, and temperature shutdown. This feature is a huge benefit of purchasing this inverter as most of the similarly rated inverters do not have this visual feature.

LED Indicators 

These indicators also work with the LCD to give you a status update of your inverter. A green LED indicates that the unit is on and receiving power.  Whenever a shutdown occurs due to an error condition, the green LED remains on.  A red LED indicates an error or alarm condition such as high voltage, low voltage, and voltage overload.

Heavy duty terminals

This feature allows you to connect your batteries easily and it accommodates large electrical loads. It has large positive and negative terminal lugs to supply the high current needed for this power inverter. A separate ground lug is also provided for the safe delivery of power.

Ultra-Silent Thermostatically Controlled Cooling Fan

The two small internal fans keep the unit cool while operating under heavy loads so proper ventilation is required for reliable operation. Like the similarly rated inverters, they are thermostatically controlled which means that they only come on when the temperature rises above the normal temperature range for this inverter.

Remote Control Outlet: This port allows direct connection to the remote panel accessory which gives you access to control the inverter from about 25ft. You can turn it off and on without even having to move an inch. However, this port is not wireless so you will need to connect the remote control using a communications cable.

Accessories of the Krieger 4000 Watt Inverter

ANL Fuse Kit:

This kit helps to protect the batteries from accidental direct current (DC) cable shorts that can cause the batteries to explode. You are required to install ANL fuse close to the positive battery bank terminal for safe operation.

Remote Control Switch:

You can control and monitor the inverter with ease from inside your motorhome via this switch. However, the connection process is not wireless. You connect this panel to the inverter via the remote cable that comes prepackaged with this inverter.

Protective Features of the Krieger 4000 Watt Inverter

Low Voltage Shutdown:

The LED illuminates RED and automatically shuts down the inverter when the battery voltage drops below 10±0.5VDC, thus protecting the battery from being completely discharged.

Low Voltage Alarm:

This feature is an indication that your battery is in need of a recharge. The alarm goes off whenever the battery voltage level has become discharged to 10.5±0.5VDC. It allows you to disconnect your devices before the inverter shuts down completely.

Over Voltage Shutdown:

The LED illuminates RED and automatically shuts down the inverter if the input voltage rises to more than 15±0.5VDC, to prevent devices from getting damaged.

AC Overload Protection:

The LED illuminates RED and the inverter will automatically shut itself down when the continuous draw of the equipment being operated or the surge draw of the equipment, exceeds the rated capacity. It prevents possible damage to the inverter and equipment connected to it in the event of a power overload.

Thermal Protection:

This feature turns the inverter off if its temperature rises above or falls below an acceptable level. The LED will illuminate RED and the inverter will automatically shut down when the temperature exceeds the limit.

Short Circuit Protection:

The inverter will automatically shut down until the short is removed. It helps to prevent malfunction or system failure when there is low resistance.

Video of a Krieger Inverter

Cost and Warranty

The cost of this inverter on Amazon is a good price for a modified sine wave inverter. It costs more than some of the similar rated modified sine wave inverter but it comes with an installation kit. This means that you do not have to spend extra cash on accessories. They also have a great warranty plan of 3 years for parts and labor.

PROS of the Krieger 4000 watt Inverter

  • Its dual USB ports are compatible for charging your tabs, iPads and cellphones.
  • It has a combination of an interactive digital display and LED notification lights to keep you updated without stress on the status of your inverter.
  • The ultra-silent thermal fans make this inverter a quiet one.
  • The installation kit that comes along with this inverter saves you the trouble of having to go purchase extra accessories like in other similar rated inverters.

CONS of the Krieger 4000 Watt Inverter

  • It has less AC outlets when compared to some other similar rated inverter.
  • It does not produce clean power like the pure sine wave inverters do.
  • Although it is a heavy-duty equipment, it is not best suited for your sensitive and power demanding appliances over a long period of time. This is because the power produced by this inverter caused these appliances to wear and tear with time and can cause them to fail unexpectedly.

Customer Reviews of the Krieger 4000 watt inverter

Even for a modified sine wave inverter, this inverter has a lot of positive reviews. It has over 2,000 reviews on Amazon as of the time of this review. It has received an average rating of 4.3 out of 5 stars which are considered to be a good one. Some of the users commended the fact that this inverter can run silently and is very efficient.

The installation kit which is another added bonus for this product is said to be very handy and of high quality. However, the shortcoming of this inverter that some of the customers complained of is that this inverter is not a pure sine wave inverter and as such is not trustworthy for use with sensitive appliances over a long period of time. Others complained of the delivery of faulty units on the purchase.


The Krieger KR-4000W even with its modified sine-wave characteristics is an excellent choice for your power needs if you don’t use it for sensitive equipment.

It is quiet and really nice on the budget. To enjoy this unit, it is essential that you identify the type of loads your inverter will be powering and how much you will be using them between charges. Once you know how much power you will be using, you can determine how much battery capacity you need.

With this inverter, you will never be left without power when you need it.

See how Krieger compare with other 4000 watt inverters.

Other Krieger Inverters  

Krieger manufactures other inverters. If you are intrested, you may read how they compare with others:

Krieger 1100 Watt Inverter

KRIËGER 1100 Watt 12V Power Inverter

Kreiger is one of the most well-known Modified inverters in this group. It has a good reputation, and ratings of 4.5/5 support the importance. With plenty of protection, including accessories (remote switch, fuse kit, connection cables), and a 3-year warranty, this is the complete package supported by the most extensive warranty in this group.

  • Good customer service feedback
  • Longest warranty in both groups
  • Wired Remote included
  • Easy to swap terminal posts
  • Remote switch only for standby mode
  • Power cords only 3 feet
Shop Amazon
07/04/2022 10:06 am GMT

See how Krieger compare with other 1000 watt inverters.

Krieger 1500 Watt Inverter

See how Krieger compares with other 1500 watt inverters.

Krieger 2000 Watt Inverter

See how Krieger compares with other 2000 watt inverters.

Krieger 3000 Watt Inverter

See how Krieger compares with other 3000 watt inverters.

(Visited 530 times, 1 visits today)
Some of the links in this post are affiliate links. This means that when you click on one of these links, I earn a small commission at no extra cost to you. Also, as an Amazon Affiliate, I earn from qualifying purchases.