How Many Solar Panels Do I Need To Power A Refrigerator?

Solar Panels Run A Refrigerator?

How much energy does a refrigerator use

Refrigerators and appliances include compressors onboard that are run through electric motors. Motors can be in 3 states: resting, continuously running, or even starting. The increase in the current generated from the compressor motor as it runs in a typical size refrigerator can increase the power required by up to 700 watts.

When the compressor is at rest, the only power drawn by the refrigerator is for onboard electronics and lighting and after the door is open. Therefore, the current taken from the source will be very low.

Once the motor begins to run after the door has opened, it will require many times more amperes of current than if it was running continuously.

Small refrigerators for the domestic market are rated as lower than 65 watts, which means that a 100-watt solar panel can run this? Find out here.

The two methods that we could determine the amount of power required to run this appliance: either read the label or conduct physical tests to measure the amount of current consumed through the appliance in amps.

Which Solar Panels Do I need to power a refrigerator?

Refrigerator connection diagram using solar panels
Refrigerator connection diagram using solar panels.

The nameplates on many fridges give the current power rating in amps. What is the relationship between this and how much power they are rated in Watts? In simple terms, watts = volts * amps, and within the U.S., a refrigerator at nominal 110 volts with a nameplate power of four amps will have the power rating of:

4 110 x 440 = 440 Watts.

Notification Important: Volts x amps are only approximate. In circuits that contain magnets, such as electric motors, volts and amps may be slightly out in phase’.

What percentage of out of phase is known as what is known as the circuit Power Factor. Sometimes this is mentioned, but generally it’s not.

In addition to the previous fact that all appliances running continuously come with a duty cycle expressed as a decimal. For instance, if the refrigerator motor runs only 70 percent in a day, the duty cycle is 0.7.

It is crucial to consider solar panel dimensions. This figure and the surge current that occurs when the motor starts are crucial to designing the most suitable solar panel system.

A Refrigerator’s Duty Cycle and Surge Current

Imagine a fridge that has a duty cycle 0.7 that typically runs on 3 amps. 70 percent of the time, it uses 3 amps of power from solar panel, and 30 percent or less, it draws zero amps. It’s so far, but the motor draws 9.2 amps in 10 seconds once it is started.

This means that for 70 percent of the time, it’s using 390 watts, and 30 percent of the time, it’s zero watts. But hidden within that 70% is the brief period when the motor’s starting current is at a high level, about three times higher than the normal.

Therefore, should we purchase a solar panel with a rating of 100 Watts to ensure it will be able to supply the short-time load?

Before we move on, we have to understand the exact amount of power we can extract from 100 Watt solar panels.

Can A 100 Watt Solar Panel Run A Refrigerator?

100W solar panel and 400W refrigerator
100W solar panel and 400W refrigerator.

In general, 100-watt solar panels could power a refrigerator for a brief period and require batteries. With 100 Watts, solar Panels produce on average 400 watts of energy each day. A fridge with a freezer that is combined requires 2000 watts per day.

What Power Can A 100W Solar Panel Produce?

It sounds like a simple answer, but it’s not. Instead, it’s contingent on many factors.

Solar panel ratings are provided to the Standard Test Condition, which means that 1 kilowatt of square centimeters of solar energy is reflected on the surface at a temperature that is 25 degrees Celsius (77 °F). This is pretty precise.

Solar Panels Standard Test Conditions for Testing – Full Insolation up to 25 Degrees C

Midday sun is great for output when the temperature rises and then falls. The output will increase! The majority of areas don’t get the maximum amount of sunlight for extended periods during daylight, or they do at any time.

The actual power output can vary significantly throughout the day and may not reach the 100-watt mark.

Sizing Solar Panels For A Fridge – Calculator

Enter the annual energy consumption in kWh for your refrigerator or other home appliances such as an air conditioner. It’s in the specifications provided by the manufacturer. The calculator will immediately tell you the amount of solar panels you will need to power a fridge as well as the battery capacity you’ll require to keep it running all day long.

Similar Questions

How Many Would Solar Panels Be Needed To Run A Refrigerator?

The question must be changed a bit to read: What is the number of panels be required to power the refrigerator for a 24-day duration?’

For example, let’s claim that 200 watts of solar could power your refrigerator during peak times in the midday But what happens in the early morning and late evening?

There isn’t the sun at night, which means you will require some method to store energy produced by the Panel. It is also important to think about the power you generate as Kilowatt-hours (kwh). You’ll be better off using the 300 watt solar panel.

What else do I need To run a Refrigerator Powered by Solar Panels?

You’ll need solar panels, an MPPT solar charge controller, and the capacity for battery storage to run refrigerators using solar panels. Use this solar panel calculator found on this page to verify the dimensions of each part are right.

How many watts does a refrigerator use?

The majority of refrigerator makers estimate the energy consumption of kWh for the entire year. Let’s say that our fridge is expected to use 800 kWh throughout the year. Divide this number by 360 to calculate the amount used per day:

800 / 360 = 2.19 KWH

Divide by 24 and then multiply by 1000 to get the Watts:

2.19 24 1000 = 91 Watts

This fridge averages an hourly power consumption of 91 watts during an entire 24 hour time frame.

Which size solar panel will I require for a 12v refrigerator?

The average 50-70 12 liter Fridge consumes around 35 Ah to 45 Ah and draws the current between 4 and six amps.

Let’s suppose that a 12 volt fridge’s average power consumption is:

12 Volts times 5 amps equal 60 watts

Energy consumed per 24 hours is 60 watts divided by 24 equals 1440 Watt-hours.

The 100-watt solar Panel that has an irradiance of 4.5 maximum-sun-hours produces:

100 watts multiplied by 4.5 = 45 Watt-hours

Solar power needed (1440/450) = 320 Watts.

Refrigerators draw greater current once their compressor motor is started, and therefore, more power is required. Additionally, most energy is consumed during the day, when the door is opened and shut a lot such as 70 to 30 watts of power use divided between night and day.

A 100AH deep-cycle battery is required to provide enough power for the motor surge of the compressor as well as power the fridge with 12 volts through the night.

How many solar panels do I need to charge a 12 volt battery?

A typical 12v 50Ah auto-batteries with a 20% discharge will require 2 hours of recharge time using a 100W Solar Panel. A deep-cycle lead-acid 12v 50Ah battery with a 50% discharge is expected to require four hours of recharge time using a 100-watt solar panel. The charge current is 5.75 amps with efficient control via MPPT. Read more in my article: “What size solar panel for charging a 12V battery?

Solar Panels Plus Batteries

It’s impossible to operate an appliance all day in the absence of batteries (remember the nighttime?), so we must figure out the amount of battery capacity that is required.

91 watts divided by the 24 hours = 2184 watts-hours

Divide by the battery’s volts to determine the current

2184/12 = 182 amp hours

90 amp hour deep Cycle solar storage battery

It’s a huge battery, But which solar panels are required to keep this battery running at all times?

In this portion of the equation, I will assume lithium Phosphate batteries as they can be depleted at up to 95% of their capacity.

In addition, lithium phosphate batteries also have numerous advantages over lead-acid batteries.

The fridge consumes 2.184 kilowatts per day. On average, suppose four hours of sunshine each day. So 100W solar Panels could produce 400 W-hours.

Dividing 2184Wh into 400Wh yields 5.46 solar panels, so you’ll require 600 solar power panels to power the refrigerator.

The conversion of D.C. into A.C. and charging the Batteries

Alongside solar panels and batteries, in addition to solar batteries and panels, you will also require the inverter to convert the D.C. voltage to A.C. Select an inverter that can handle twice the amount of load as the appliance you are using.

A solar charge controller connects the solar panels and the batteries, ensuring uninterrupted and secure recharge.