What inverter do I need to run a fridge?

Refrigerators are a staple in most homes. They are often one of the most used appliances in a household. The average lifespan of a refrigerator is around 15 years. However, the longevity of the fridge partially depends on the consistent flow of power. Power fluctuations can damage the internal mechanism of the system. This is why power inverters are so important for the smooth functioning of the fridge.

A power inverter is an electrical device that converts DC (direct current) power to AC (alternating current) power. A pure sine wave inverter is the most efficient type of power inverter. It produces AC power that is identical to the power supplied by the utility company.

Why is it important to use a pure sine wave inverter? Because the fridge has sensitive electronic components that can be damaged by power surges. Power surges can occur when there is a sudden change in the AC power supply, such as when the fridge is turned on or off. A pure sine wave inverter will protect the fridge from power surges and ensure that it has a long, durable lifespan.


What is pure sine wave inverter?

Pure sine wave inverters are often used with sensitive electronic equipment because they create a very clean and stable AC power source. This is in contrast to most inverters on the market, which generate a modified sine wave.

WZRELB power inverter

There are many advantages to using a pure sine wave inverter including:

1. Clean and stable power: Pure sine wave inverters generate a clean and stable AC power source that is ideal for sensitive electronic equipment.

2. Efficient: Pure sine wave inverters are more efficient than other types of inverters, meaning they waste less energy and run cooler.

3. quieter operation: Pure sine wave inverters generate a quieter AC power source than other types of inverters.

4. More ups and downs: A pure sine wave inverter can better handle voltage fluctuations than other types of inverters.

5.Longer life span: Pure sine wave inverters tend to have a longer life span than other types of inverters.

Pure sine wave inverters produce high frequency technology that is perfectly suited for appliances like refrigerators, which are very sensitive.Too high a power frequency can damage the internal electrical surfaces. A pure sine wave inverter will prevent this from happening, keeping your refrigerator running smoothly.


How to Run a Refrigerator on an Inverter?

If you're looking to run a refrigerator off of an inverter, you'll need to make sure you get one with enough power to handle the appliance. Inverters come in different power capacities, so you'll need to find one that can handle the wattage of your fridge. You'll also need to make sure you have enough battery capacity to run the inverter for a reasonable amount of time. With a little planning, you can get an inverter that will work perfectly for your needs.


Power Draw

If you're shopping for an inverter, you'll need to know the power draw of your refrigerator in watts. This information can be found on the manufacturer nameplate, expressed as amps or watts.

power draw of refrigerator

If the nameplate gives the watts, you're all set. But if it only gives amps, you'll need to convert amps to watts by multiplying the amps by the voltage. For example, if your typical 16 cu. ft. fridge draws 6 amps, you'd multiply 6 by 120 volts to get 600 watts. That's your running wattage.

A fridge motor also needs a jolt of about five times its running wattage when it starts up. So, in our example, you'd need an inverter that can handle 3,000 watts (600 watts x 5).

Keep in mind that you may need a bigger inverter if you have other devices you want to run at the same time, such as a TV or laptop. But once you know the power requirements of your fridge, you'll be well on your way to choosing the right inverter for your needs.


Inverter Specifications to Consider

Inverters are a vital part of any solar system, providing the AC power needed to run appliances and other devices. In general, inverters have three ratings that you need to be aware of in order to select the right one for your needs.

●The Continuous Power rating: in Watts (W).

●The Surge Power rating: in Watts (W).

●The Input Voltage Rating: in Volts (V).


1. Continuous Power Rating:

An inverter's power rating is the maximum amount of electrical power (in watts) that the inverter is designed to continuously deliver at its output. When an inverter is rated at a certain wattage, that wattage usually refers to continuous power. For example, this Wzrelb 3000W pure sine wave inverter designed to output 3000W of power. This means that if an energy source is provided (battery, solar panels, etc.), this inverter can run anything that consumes 3000 watts or less. Some common items that use a 3000 watt inverter are: power tools, computers, televisions, and small appliances.


2. Surge Rating:

This is the amount of power the inverter can produce for a short period of time (usually less than a second). A 2500w pure sine wave inverter offered at Enogy stores provides 2,500 watts of continuous AC power and 5,000 watts of surge power. If you're using refrigerators, freezers, microwaves, water pumps, air conditioners, or any other appliance with a compressor or motor, this rating is especially useful. This is because these appliances can require up to 10 times their running wattage to startup (usually 3 to 7 times). For example, a refrigerator that requires 500W to run may require up to 5000 watts of power to start up. Usually, such a refrigerator will need between 1500 and 3500 watts to start. Knowing the difference between these two values is important when choosing an inverter, as you'll want to make sure that the inverter you select can handle the loads you'll be putting on it.


3. Input Voltage:

Inverters take direct current (DC) electricity from your solar panels or batteries, and convert it into alternating current (AC) electricity. This is the same type of electricity that your home or office uses. Inverters also stepped up the voltage of the AC electricity, from the low voltage (usually 12 volts) that comes from your solar panels or batteries, to the higher voltage (110-120 volts) that is needed to power most appliances and devices. When shopping for an inverter, it's important to make sure that the input voltage rating matches the voltage of your battery. Most inverters have either a 12V or 24V input, so you'll need to make sure that your battery is compatible. For example, this WZRELB inverter has an input voltage of 12V, while this 1200W Giandel inverter is rated at 24V. So before making your purchase, be sure to check the specs to ensure that the inverter will work with your battery. As an inverter owner, it's important to be aware of the acceptable input voltage range for your device. For 12V inverters, the range is usually between 10V and 15V. For 24V inverters, the input voltage can range between 21 and 30 volts. Knowing these ranges can help you keep your inverter running smoothly and avoid damage to your equipment.


Inverter For Refrigerator

When choosing an inverter for your refrigerator, it's important to choose one that's rated at 5 times the running wattage. This will ensure that the inverter can handle the running power of the fridge, as well as the surge power required to start it. In most cases, this will be more than enough to keep your refrigerator running smoothly. Here's a quick guide to refrigerator sizes, power usage, and inverter sizes to help you make the best choice for your needs.


Refrigerator type Refrigerator Size Power Usage (Watts) Inverter Size
Cont. Surge
Mini-fridge 4 Cu. ft. 75W 400W 800W
RV fridge 10 Cu. ft. 150W 750W 1500W
Full-size fridge 1 16 Cu. ft 200W 1000W 2000W
Full-size fridge 2 22 Cu. ft. 300W 1500W 3000W


Battery Capacity

When you're living off the grid, one of the most important appliances you need to power is your refrigerator. But how do you know how much DC battery capacity you need to keep your food cold?

Battery Capacity

The battery capacity you need primarily depends on two factors:

  • The energy consumption of the refrigerator.
  • The chemical composition of the battery.

Energy consumption of the refrigerator

To calculate the energy consumption of the refrigerator, you need to consider the rated electrical power of the refrigerator and the running time of the refrigerator.

The rated electrical power of the refrigerator can usually be found on the label, the manual, or the manufacturer's website. The energy consumption of the refrigerator cannot be precisely determined like many other appliances. This is because the compressor has a running cycle or duty cycle. This means that although the refrigerator is continuously plugged in, it opens and closes randomly throughout the day. As a general rule of thumb, the refrigerator runs for only about 20 minutes per hour on average. This means that a refrigerator only needs to run for about 8 hours in a 24-hour period.

With the following formula, we can calculate the daily energy consumption of the refrigerator (in watt-hours):

Daily energy consumption (Wh) = Power (Watts) x 8 hours.

Chemical composition of the battery

Different battery chemical compositions have different acceptable depth of discharge. For example, a 100Ah lead-acid battery can only provide around 50 Ah of energy without shortening the battery life. Meanwhile, a 100Ah lithium battery can provide 80Ah.

The following table provides information on battery chemistry and their recommended discharge depth for optimal use without damaging the battery:

Battery Chemistry Recommended Depth of Discharge (DoD) Usable Battery Capacity
50Ah 100Ah
Lead-acid 50% 25Ah 50Ah
Lithium Ion 80% 40Ah 80Ah
LiFePO4 80% 40Ah 80Ah


How to calculate the battery capacity required to run the refrigerator:

Once you have determined the daily energy consumption (Wh) of the refrigerator and the actual running time, you can calculate the battery capacity you need with the following formula:

Battery capacity = Daily energy consumption (Wh) x Number of days ÷ Depth of discharge

For example, if you use a lithium battery to power a 100-watt refrigerator for one day during your travels, you would need a lithium battery capacity of:

Required energy = Daily energy consumption (Wh) x 1 day = 100 W x 8 h x 1 day = 800 Wh

Battery capacity (Wh) = Required energy ÷ 0.8 = 800 Wh ÷ 0.8 = 1000 Wh

To get the battery capacity in ampere-hours, I will divide this result by 12:

Battery capacity (Ah) = 1000 Wh ÷ 12

Battery capacity (Ah) = 83.33 Ah

A good fit would be this 12V 100Ah LiFePO4 Lithium Iron Phosphate Battery


Battery Ratings

Lead-acid batteries are an essential part of many electrical systems, but it's important to understand how they work in order to get the most out of them. One key piece of information is the ampere-hour rating.

This rating tells you how much current the battery can deliver for a specific period of time. For example, a battery rated at 105 ampere hours can provide 105 amps of current for one hour.

Battery Ratings

However, it's important to note that you shouldn't drain a lead-acid battery below 50 percent of capacity. Doing so can damage the battery. So, in the case of a 105 ampere-hour battery, you safely can draw 105 amps for only 30 minutes.

This information is useful when determining how long devices can run off of a lead-acid battery. For example, a fridge drawing only 55 amps can be run for about 60 minutes on a 105 ampere-hour battery. Understanding ampere-hours is a critical part of using lead-acid batteries. By knowing this information, you can make sure you're getting the most out of your battery and avoid damaging it.


Common Faults of Power Inverter


Battery failure or losing connection

If your battery power inverter fails to turn on, there are a few things you can try. First, check the connections to the battery. If they are loose, simply tighten them up. If that doesn't work, the problem may be rust or corrosion in the battery. Try cleaning the battery with a solution of hot water and baking soda. If that doesn't work, the battery may be dead and you'll need to replace it.

WZRELB 1500W Pure Sine Wave Inverter


The inverter does not turn on

When your power inverter is not turning on, it can be frustrating. There are a few things you can do to troubleshoot the issue. First, check the battery power or voltage. If the battery is low, it may not be providing enough power to the inverter. Next, check the connections to make sure they are tight and secure. Finally, check components like the fuse to see if they are blown or damaged. If you can't find the issue, it's best to contact a professional technician for help.


Inverter makes noise

If you notice that your power inverter is making strange noises, it could be a sign of a problem. Thankfully, most of the time, it simply means that the fan is clogged up. You can either clean it or replace it if it has sustained too much damage.

pure sine wave inverterr fan

If possible, make sure to get a replacement fan that is a smart cooling fan. This is one of the safety features that will keep your inverter working properly. By having this type of fan, you can be sure that your inverter will continue to function properly and safely.


Inverter LCD error code

If you're getting unrecognizable or false codes from your power inverter's digital display, it could be indicative of a serious internal fault. Replacing parts of the inverter circuit is often the only way to resolve the issue.

External technical issues can also affect an inverter's operation. If this is the case, start by checking the battery cables. Then, check the wires at the input and output or the load.

If you're still having trouble determining the cause of the problem, it's best to consult with a professional. They will be able to help you diagnose and resolve the issue.

Check out our selection of Inverters in our shop to see which ones meet your power needs. For more information, you can check these articles:

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