One of the common questions that pop up in a homeowner’s mind is, “Can I rely on solar panels to power my whole house?”

The only way to answer that is by figuring how much energy do solar panels produce. You may be curious if solar panels can produce enough energy to keep up with your house’s energy requirements.

Before you install rows of solar panels, don’t you want to know if they can cover just a few bulbs or your whole electricity bill?

This article aims to answer all your questions regarding the energy production capabilities of a solar panel. Let’s see how much energy these solar panels have packed in for you!

Key Takeaways

  • Solar panel output is crucial to determine whether they can meet your energy needs and savings goals for your home.
  • Calculating a solar panel’s output involves factors like panel size, efficiency, sunny hours, and more, and online calculators can help provide estimates.
  • Various factors such as capacity, efficiency, roof direction, weather, location, and equipment impact a solar panel’s energy production and should be considered when planning a solar installation.

Why Does Solar Panel Output Matter?

The productivity and output of your solar panel will help you reach your energy production target. Depending on the output of a single solar panel, you have to determine how many units does your space requires.

It’s also crucial to determine the solar panel output to meet your energy-saving goals. For example, if you want to save 50% on energy bills, you’ll require more solar panels as opposed to 30% savings.

How to Calculate a Solar Panel’s Output?

You should know that all solar panels have different designs and construction. It’s tricky to make a general statement on how much energy does a solar panel generates.

The best way to go about calculating your solar panel’s energy production is using an online calculator. These online calculators can give you a fair idea about energy production and the amount of savings.

We also have a few common benchmarks that can help you in estimating your unit’s output:

Per Day Output of a Solar Panel

Solar Panel Output CalculationYou can work out how electricity your solar panels produce daily with a simple formula. Remember, this formula represents the values in kilowatt-hours (kWh).

First, the size of your solar panel (in sq. mt) x 1000

Next, multiple the results x efficiency of a single solar panel (percentage as a decimal)

Then, the results x number of sunny hours in your region every day

Finally, divide it by 1,000.

For example,

You have a solar panel that is 1.6 square meters in size, then:

6×1000 = 1600

And, your panel has an efficiency of 20%:

1,600×0.2 = 320

And your area receives 4.5 hours of sun every day:

320×4.5 = 1,440

Finally, when you divide it by 1,000, the final output is 1.44 kWh per day. You should also know that the sun hours will greatly vary throughout the year.

Per Month Output of a Solar Panel

To calculate the energy output of your solar panel for the whole month, figure out the daily amount and multiple it by 30.

So, if your solar panels generate 1.44 kWh every day, then:

1.44 x 30 = 43.2 kWh every month

Per Square Meter of a Solar Panel

Typically, most domestic solar panels sport a 4 kW system. This system has 16 panels, and each one is:

  • Designed to produce almost 265 watts of power
  • Measure around 1.6 square meters in dimensions

If you want to figure out the output per square meter, you can do it using this formula:

Number of solar panels x total capacity of your solar panel system

Then, capacity ÷ the total size of the solar system.

What Is the Annual Productivity in Varying Sunshine Conditions and Solar Panel Wattages?

We’ve curated tabular data that will help you estimate the annual power output for your solar panels. Also, the table consists of five sunshine conditions:

Solar Panel Wattage1300 kWh/kW1500 kWh/kW1700 kWh/kW1900 kWh/kW2100 kWh/kW
240 W312360408456504
270 W351405459513567
300 W390450510570630
330 W429495561627693
360 W468540612684756

This table will give you a faint idea of what output to expect from one solar panel. These were the average sunshine and most common solar panel wattages. However, only the manufacturer can offer you a precise estimate of the power output.

The solar panel manufacturing company will consider factors such as roof orientation and local sun hours. These factors are unique for each user.

How Much Electricity Can a Single Solar Panel Produce?

Solar Panels on Roof‘How much’ depends on a few factors that we’ll discuss in the latter part of this article. The manufacturer tests each solar panel to verify how much electricity it will produce in the best-case scenario.

The manufacturers typically conduct a Standard Test Condition (STC) to verify the ultimate power output of the solar panels.

Also, the manufacturer will elaborate on the solar panel’s output range in terms of power rating or offer a wattage within the range of 200 to 400 watts. However, a premium-end and costly solar panel may be able to give you more than that.

The specific panel’s name may also contain the wattage of the product. However, the STC might not stand to be true in real life. It is because of temperature fluctuations and passing clouds.

In a nutshell, your solar panel’s output will vary and fluctuate every time and every day. Well, it’s time to let you know what factors affect the power output of your solar panels.

What Factors Affect Solar Panel’s Energy Production?

These are the factors that influence the energy production capability of your solar panel:


You should know the maximum capacity of your solar panel that it can produce in ideal environments. Mostly, the manufacturers mention the total capacity as “rated output” or “rated capacity.”

Most of the domestic solar panel systems feature a capacity ranging between 1 kW to 4 kW. You should know that your solar panel cannot produce beyond the rated capacity.


The total energy production also tends to depend on the efficiency of your solar panels. How much sunlight can your solar panels turn into consumable energy?

Solar panels demand stringent conditions, and they are never 100% efficient. These days, the most common household solar panels have an efficiency of about 20%.

You may find solar panels with 40%-50% efficiency, but they tend to be highly expensive. Also, solar panels with higher efficiency use less roof space.

Roof Direction

It would be best to consider your rood direction as it significantly impacts your solar panel’s energy performance. The solar panels work best with south-facing roofs.

It is because the sun is always south of your home. However, even east or west-facing roofs can also do the job. In any case, your focus should be to ensure that your roof receives abundant sunshine!

Roof Angle

The roof angle and shade play a huge role in your solar panel’s energy production output. Firstly, your roof should have a 30-degree angle to give the best performance.

The more straightened roofs might not be able to position the solar panels effectively. Likewise, your roof must be free from blocks or shades.

There shouldn’t be any trees or structures blocking the sunlight. Both shade and angle affect the performance of your solar panel.


You have to consider the materials if you are trying to analyze how much energy your solar panel produces. Solar panels can equip different materials. Also, the different materials come with varying price tags.

Typically, you’ll find solar panels in two materials:

  • Polycrystalline Panels: Polycrystalline panels equip budgeted materials for its construction. The use of average standard materials makes the polycrystalline panels less efficient.
  • Monocrystalline Panels: These panels typically use high-grade silicone. The use of high-quality materials makes them more efficient in terms of space and output. These panels tend to generate better output than polycrystalline panels.

Weather and Climate

Solar PanelsRegardless of the efficiency and quality of your solar panel, it might still produce a lower output. The only one to blame here is the weather. Often, the clouds block sunlight from reach your solar panels.

Also, dust or snow might cover the surface of the solar panel. The solar installers use weather patterns and historical data to estimate the product’s energy output.

Several other weather-related factors affect the efficacy of your solar panels. It would help if you considered all-year-round weather phenomena to make energy estimations.

Your Location

Not all locations around the world receive the same amount of sunlight. You can’t expect the same amount of sunlight in both colder and tropical regions.

Also, high altitude locations enjoy the clear sky and high pressure. As a result, the sunlight exposure is more. The more sunlight your solar panels will receive, the higher will be their energy output.

What’s the Equipment’s Impact on Energy Production?

The equipment that makes up your solar power system also affects the ultimate output of your solar panels. Here are some aspects you should note down:

Tolerance Rating of Solar Panels

A first-time buyer might not be aware, but solar panels also come with a tolerance rating. The tolerance rating refers to how much power the panels can produce concerning their wattage.

It means that the solar panels might generate a lower power output than the wattage specified at STC. For this reason, we recommend you look into the tolerance rating of your solar panels as well.

Degradation of Solar Panels

You cannot avoid the damage and degradation in solar panels. Like other electronic devices, solar panels won’t offer smooth and similar performance for their entire lifespan. As the solar panels become older, their energy-producing capacity will also reduce.

This degradation process is inevitable. You will lose a small amount of power output with each passing year. So, while estimating the energy output for your solar panels, you should also consider this factor.

Also, each solar panel includes guarantees and performance warranties. The warranty must state a specific percentage beyond which the performance should not drop.

Solar Panel Mismatch

Solar PanelsAnytime you pair up to devices, there’s a likelihood of a loss in output and efficiency. Even though you pair solar panels with the same power rating, they may experience a slight loss.

The solar panel mismatch also depends on the type of inverter you choose. Power optimizers and microinverters operate on a panel-by-panel basis. Also, the industry standard for string inverts is only around 2%.

Connections and Wiring

Your solar panels may experience a small amount of loss in electricity due to voltage and heat as it travels around. From the panel to the utility meter, the energy might vary significantly.

However, with a proper and correct connection and wiring, you can minimize that loss. Wiring and connections often make up for energy loss.

Another crucial factor that can reduce output is distance. The inverter’s distance from the utility meter might result in lost power.


The solar panels produce energy in the form of DC power. The inverter is responsible for converting this DC power into AC power. Your home and business spaces consume electricity in the form of AC power.

This essential process of energy conversion, unfortunately, accounts for a minimal loss inefficiency. Also, there is no fix to this problem as it is an inevitable step in the process.

How Can I Check If My Solar Panels Are Working Efficiently?

Your solar panels will have a connection to a control panel known as an in-home display. It is a wireless device that you can use to track the electricity generation of your solar panels. In case your solar panels are underperforming, this wireless device can help you identify that.

However, don’t try to tamper with your solar panels if they are not working properly. Instead, the right thing to do is ring your manufacturer or technician.

Experience Solar Excellence with Us!

Trust in Solar Panels Network USA, where our seasoned experts deliver top-quality solar solutions for homes and businesses nationwide. With a legacy of countless successful installations and a commitment to sustainable energy, we’re your reliable partner in the solar journey. Ready for a brighter, eco-friendly future? Call us now at (855) 427-0058 and harness the power of the sun!


To power your whole house with solar panels, you need several units of them. The energy production capabilities of a solar panel depend on several factors.

Also, the right number of solar panels for your home depends on the energy consumption levels of your home. In any case, you should opt for solar panels after calculating their entire energy production capabilities.

Hopefully, this article answered all your questions related to a solar panel’s total energy production!

About the Author

Solar Panels Network USA stands at the forefront of solar energy solutions, driven by a team of seasoned solar engineers and energy consultants. With over decades of experience in delivering high-quality solar installations and maintenance, we are committed to promoting sustainable energy through customer-centric, tailored solutions. Our articles reflect this commitment, crafted collaboratively by experts to provide accurate, up-to-date insights into solar technology, ensuring our readers are well-informed and empowered in their solar energy decisions.