# Can a Solar Panel Run a Dehumidifier?

Written By: | Last Updated on: June 28, 2023

With the rising prices of energy and growing environmental concerns, more people are turning to renewable energy sources to power their homes and appliances.

But one question that arises in this context is: ‘Can a solar panel can run a dehumidifier?’

Solar panels can power a dehumidifier but the process involves understanding the energy requirements of your dehumidifier and the number of solar panels needed to meet these demands.

In this article, I’ll guide you on determining the number of solar panels needed to run your dehumidifier, considering factors like energy consumption and peak sun hours. I’ll also discuss battery sizing for energy storage and the role of inverters.

## Key Takeaways

• Solar panels can run a dehumidifier, but you need to calculate the number of solar panels needed based on your dehumidifier’s energy consumption and the average peak sun hours in your location
• The theoretical solar system size can be calculated by dividing daily energy consumption by the average peak sun hours
• You must factor in the solar system losses when determining the actual solar system size needed
• The number of solar panels can be calculated by dividing the actual solar system size by the rated power output of each panel
• A solar battery system is needed for storing excess electricity generated by solar panels during the day for later use when the panels aren’t producing enough power
• An inverter is necessary to convert the DC power produced by the solar panels into AC power that can be used by your dehumidifier

## How to Calculate the Number of Solar Panels You Need to Run a Dehumidifier?

### 1. Calculate Your Dehumidifier Energy Consumption

Before we start, it’s important to determine how much energy your dehumidifier uses.

You can do this by referring to the owner’s manual or searching online for the power consumption of your specific model.

I use a standard household dehumidifier, and it consumes around 400 watts per hour when it’s in use.

If I use it for 8 hours a day, we can calculate the daily energy consumption of my dehumidifier as:

Total Daily Consumption = 8 x 400 Watts = 3,200 Watt-hours (Wh)

We’ll be using this figure in our calculations later.

### 2. Find out Your Peak Sun Hours

The energy production of solar panels depends on how long the sun is out and how much direct sunlight they receive.

However, sunlight intensity varies greatly throughout the day and is also influenced by weather conditions.

For instance, solar irradiance can be as low as 300W/m² during cloudy or overcast times, while at other times, it can reach as high as 1000W/m² under clear skies.

That’s why it’s essential to determine the average peak sun hours for your location.

Peak sun hours refer to the number of hours in a day when the solar irradiance is equivalent to 1000W/m²

This metric is crucial for calculating the solar energy production potential of your solar panels, as it provides a standardized measure of sunlight intensity over time.

You can use the NREL (National Renewable Energy Laboratory) calculator to find the peak sun hours for your location.

This tool provides accurate solar data based on your geographic area, helping you determine the average peak sun hours you can expect.

live in Los Angeles, California, where the average peak sun hours are around 6.3 hours per day.

This means that, on average, my solar panels would receive 5.6 hours of sunlight per day with an irradiance of 1000W/m².

### 3. Calculate Your Theoretical Solar System Size

We have now gathered all the necessary information to calculate the theoretical solar system size needed to power your dehumidifier.

You already know your dehumidifier’s daily energy consumption, and you’ve determined the average peak sun hours for your location.

With these two values, you can calculate the theoretical size of the solar system required to meet your dehumidifier’s energy needs.

To calculate the theoretical solar system size, divide your dehumidifier’s daily energy consumption by the average peak sun hours:

Theoretical Solar System Size = Daily Energy Consumption / Average Peak Sun Hours

For example, if your dehumidifier’s daily energy consumption is 3,200 Wh and you have 6.3 peak sun hours in your location:

Theoretical Solar System Size = 3,200 Wh / 6.3  hours = 507.94 W ~ 508 W

In this example, a solar system with a capacity of approximately 508 watts would be needed to generate enough energy to power your dehumidifier.

But this value is a theoretical estimate, and you’ll still need to account for additional factors such as system losses and efficiency to determine the actual number of solar panels required.

### 4. Factor in Solar System Losses

Any solar system will experience some losses due to factors like shading, inverter efficiency, thermal losses, dirt accumulation, wiring resistance, and other factors.

These losses can have an impact on the actual output of your solar system, so it’s important to factor them in when calculating the size of your solar system.

The industry standard for accounting for these losses is typically around 14%

By applying this figure, you can calculate the actual solar system size needed to meet the energy requirements of your dehumidifier.

To determine the actual solar system size, multiply the required solar system size (the adjusted solar system size calculated earlier) by 1.14:

Actual Solar System Size (in Watts) = Required Solar System Size (Watts) x 1.14

For example, if the required solar system size calculated was 508 watts:

Actual Solar System Size = 508 W x 1.14 = 579.12 W

Rounding to the nearest whole number, the actual solar system size needed to power your dehumidifier would be approximately 579 watts

This means that you would require at least 579 watts of solar panels to ensure sufficient energy generation for your dehumidifier, considering the potential losses that can occur in the solar system.

### 5. Calculate the Number of Solar Panels

Solar panels are typically rated by their power output, which is measured in watts.

The wattage ratings of most solar panels on the market range from 250W to 400W

This rating indicates the amount of power that the panel can generate under peak sun conditions per hour.

For instance, a 300W solar panel will generate 300 watts of power per hour when exposed to sunlight with an intensity of 1000W/m².

Now, let’s apply this to our example.

Considering a required actual solar system size of 579 watts, we can calculate the number of solar panels needed using the following formula:

Number of Panels = Actual Solar System Size (Watts) / Rated Power Output of Each Panel (Watts)

Using a 300W solar panel as an example, we can determine the number of panels required:

Number of Panels = 579 Watts / 300W = 1.9 ~ 2

Rounding up to the nearest whole number, we find that we’ll need at least 2 solar panels to meet the energy demands of our dehumidifier.

Therefore, to power the dehumidifier with a solar system size of 579 watts, you would require a minimum of 2 solar panels, each with a rated power output of 300 watts.

## What Battery Size Would I Need to Run a Dehumidifier?

Solar panels generate DC electricity, but they don’t have the capability to store it.

This means that when it gets dark and the panels are no longer producing electricity, you won’t have power unless you have a storage solution.

This is where solar battery systems come into play.

A solar battery system allows you to store the excess electricity generated by your solar panels during the day, so you can use it later at night or when the panels aren’t producing enough power.

To calculate the size of the battery you need, you can use the following formula:

Battery Size (Ah) = Solar Panel Daily Output (Wh) / Battery’s Voltage (12/24V) / Depth of Discharge (DoD) (0.5/0.75/0.8)

In our example, let’s calculate the solar panel’s daily output using the formula:

Solar Panel Daily Output (Wh) = Number of Panels x Rated Power Output per Panel (W) x Peak Sun Hours x (1-0.14)

Considering the previous example of using 2 solar panels, each with a rated power output of 300 watts, and having an average of 6.3 peak sun hours per day, the solar panel’s daily output would be:

Solar Panel Daily Output = 2 panels x 300 watts x 6.3 hours x (1-0.14) = 3,250.8 Wh

Now, assuming we are using a 12V battery and a Depth of Discharge (DoD) of 80%, we can calculate the battery size as follows:

Battery Size (Ah) = 3,250.8 Wh / 12V / 0.8 = 338.6 Ah ~ 339 Ah

In this example, you would need a battery with a capacity of approximately 339 ampere-hours (Ah) to run your dehumidifier effectively during periods without sufficient sunlight.

## Do I Need an Inverter to Run a Dehumidifier on Solar Power?

You need an inverter to run a dehumidifier on solar power.

Solar panels generate direct current (DC) electricity, while most household appliances, including dehumidifiers, operate on alternating current (AC) electricity.

So, an inverter is necessary to convert the DC power produced by the solar panels into AC power that can be used by your dehumidifier.

The inverter’s size will depend on the specific requirements of your solar system and the power demands of your dehumidifier.

If you are using a grid-tied solar system, you can calculate the size of the inverter using the following formula:

Inverter Size (Watts) = Rated Power Output of Each Panel (W) x Number of Panels x 1.15

For example, if you have a single 300-watt solar panel:

Inverter Size = 300 Watts x 2 panel x 1.15 = 690 Watts

This indicates that you would need an inverter with a capacity of approximately 690 watts to run your dehumidifier efficiently.

However, if you are using a small off-grid system, the inverter size will depend on the total power requirements of all your appliances.

You would need to add up the power requirements of your dehumidifier, along with any other devices you plan to power.

For instance, if your dehumidifier requires 400 watts, and you have additional appliances such as a laptop with a power requirement of 30 watts and other devices totaling 50 watts, the inverter size would be:

Inverter Size = 400W + 30W + 50W = 480 Watts

In this case, an inverter with a capacity of approximately 480 watts would be suitable for running all the appliances mentioned.

## FAQs

### Can a Dehumidifier Be Run on Solar Power?

A dehumidifier can be run on solar power by using solar panels to generate the required electricity.

### Can I Run My Air Conditioner With Solar Panels?

You can run an air conditioner with solar panels, but it may require a larger solar system due to the high energy consumption of air conditioners.

### Is Humidity Bad for Solar Panels?

Humidity is bad for solar panels as it can have a minor impact on their efficiency, but regular cleaning and maintenance can mitigate these effects.

### Can You Run a Dryer With Solar Panels?

You can run a dryer with solar panels, but due to the high energy consumption of dryers, a larger solar system may be required.

## Conclusion

As promised, we’ve covered the process of determining the number of solar panels needed to power your dehumidifier, along with calculating battery size for energy storage and the importance of inverters.

And if you ask me, I’d recommend switching all your household appliances to solar energy. It’s greener, more reliable, and will save you a lot of money in the long run.