How Many Solar Panels Do I Need? System Size Guide

You might be wondering how many solar panels you need for your home, here you can get the answer to this question.

With the help of this post, you can have a look at the system size guide. The use of solar panels has become one of the biggest trends.

To determine what size range of solar energy system you need, the person has to do a few of the calculations. These are simple calculations that you have to carry out.

It depends on your electricity needs that how much solar panels you require. If you want to completely and wholly eliminate your electricity bill, then you will be in need of a huge solar panel system.

Moreover, keep in mind and consider your household consumption levels. You will be required to calculate and assess how many kilowatt-hours of power your home needs!

It is on this calculation that you can decide which is the correct solar panel system size is for your home.

Let us have a look at the other details and remove our queries. Still, if you have any question on this solar panel system size guide, you can share with us. And we will solve your ambiguities:

Important Points On the Solar Panel System Size Guide!Solar Panel System

Most importantly, an average homeowner, he demands and constantly needs 28 to 34 solar panels to completely and fully offset the presence of electricity bill.

The location where your home exists and the performance of your solar panel, it needs to be kept in mind as well.

To make this job easy, what you can do is to make a comparison of solar quotes.

From this comparison, you can well and clearly know how many solar panels you are in need of, how much are your energy needs!

Amount of KWh Average Solar Panels Generate and Produce:KWh Average Solar Panels

This is an important question that will further help you in following this guide. It is that how much is the amount of kWh that average solar panels generate and produce.

Most noteworthy, this amount of power depends on how much amount of sunlight your solar panel receives.

The more it is exposed to the sun, the more power it will be produced.

Less sunlight it is receiving, it means less kWh of power it will generate.

In addition, this amount of sunlight also depends on where you are residing.

Some countries receive less sunlight per day. Other countries receive a maximum number of hours. Like, we can give you an example.

It is seen that California has more sunny days on an annual basis than New England.

Hence, if you are living in an area that receives sunlight for less duration, then that person needs to go for a large solar panel system.

And if your home resides at a location that receives and get massive sunlight daily, then you can go for a smaller solar panel system.

What to do If You are Living In a Less Sunny Area?Less Sunny Area

Besides, it is seen and noticed that Solar panel systems present in California, they are comparatively smaller than that of the solar panel systems used and installed in Massachusetts.

This happens because California solar panels produce and generate the same amount of power because they are constantly exposed and receive more amount of sunlight each year.

So, if you are one of the homeowners who is living in less sunny areas, what he or she can do is to go for more efficient solar panels.

Beyond, he can increase and amplify the size of their overall solar energy system. It means you can slightly increase the number of solar panels present on your rooftop.

How to Know How Many Solar Panels You Need?Solar Panels

You can make and pen down a comparison of your average annual energy needs. From these details, you can at least get a picture regarding how many panels you need in your home.

And how much is your exact and accurate power needs?

There are a few of the common system sizes that are right now excessively and immensely active in the marketplace.

Furthermore, there is a standard 250-watt solar panel that can be used as a benchmark if you are still unsure and unclear about your power needs.

It is true that the most difficult and tough of all aspects regarding determining and finding out the sizing of any kind of solar panel system is to make an estimation and prediction of annual energy usage needs.

If you are using larger consumer products, then they can drastically change your annual kilowatt-hour needs.

Or if you have placed some electric appliance add-on in your home, then this factor can also significantly and specifically alter your kilowatt-hour requirements.

As an example, if you are planning to install a central air conditioning system or you are making plans to power a heated swimming pool, then at that point, you have to change your solar panel array as well.

How to Select the Right Solar Panel System?Right Solar Panel System

There are many factors that you have to keep in mind.

Like, budget factor and available roof space factor. Moreover, you have to consider your electricity consumption needs and future energy usage plans.

Some people think that bigger solar panels are always better. Some do not agree with this notion. Below you can see the details regarding how bigger solar panels are ideal and better for you:

Why Bigger Solar Panels are Ideal and Comparatively Better?Bigger Solar Panels

It is believed by some people that bigger is better. As solar panels are budget-friendly, that is why people prefer to go for big solar systems.

Most probably, it is assumed that big solar panels come with higher feed-in tariffs as well the fast payback on any of the additional kilowatts.

If you think that you can fully and wholly afford the upfront cost and you do possess sufficient and enough roof space, then it is a wise idea to go for big solar panels.

It s suggested and this best piece of advice is given by the experts that one should go for a solar panel system size of no less and minimum than 5kW.

Or you can prefer to go for a 6,6kW system that comes up with a 5kW inverter.

It is observed that the price of a 5kW solar system, it varies and differ all according to your area and location.

However, it falls in the price range of in between $5,500 too $8,000. Hence, going with this option will be a good and reliable and also a quality installation option for your home.

Apart from that, if it is a 5kW solar system, then it will be made up and composed of 20 x 250W panels, or you can 15 x 333W panels.

The solar panel that you are choosing and preferring to go for, you have to consider its efficiency scale as well.

There is this rule, the higher the efficiency, it means the less number of solar panels you will require and need.

The Factor of the Physical Size of Solar System Panels!Physical Size of Solar System Panels

Taking an example of a 5kW solar system, it tends to generate and produce enough amount of power and energy to run your home.

However, if you are running short of enough roof space, then you can consider this standard dimension of panels.

They are available in the dimension range of 1.70m x 1.00m. It means that they need 1.7m2 for each and every solar panel that is being installed. Moreover, the wattage output (W) range of the solar panels, it is going to vary in between 250W and 360W.

Hence, do make an effort to look for a more efficient solar system module. We can further guide and help you that for 1kW of your solar system, you are going to require 4 x 250W panels, or you can say, you need 3 x 330W.

Besides, if any of you is considering and planning to go for a 5kW system, then he will need 15 and 20 solar panels for 25.5 to 34m2 of roof space.

Why Going for Larger Solar Panel Systems?Bigger Solar Panels

As previously recommended and suggested to you, you should go for larger solar panel systems.

In the coming up times, it may come out to be a necessary need for your home. These kinds of solar-powered panel systems give you a faster payback.

You experience higher feed-in tariffs. You see high savings equation. That is why this option is more appealing. This panel system can meet your daily needs. in addition, a larger system is always rewarded financially.

It provides you with excess power. Hence, the larger the system, it means the cheaper and budget-friendly the price per kilowatt (kW) will come out to be.

Giving you rough price estimates, 3kW system is going to cost you around $4,397. If buying a 5kW system, then its price will be around $5,866. Besides, the price that you will pay for per kilowatt, it is $1,465 for a 3kw system and $734 for an additional 2kw.

What to do If You do Not Want to Buy a Large Solar Panel System Unit?Large Solar Panel System Unit

If any of you is not in favor of buying and purchasing a large solar panel system unit, then he can consider some other alternatives.

Like, if you do not feel like buying a 5 or 6.6kW solar panel system, then calculate the total amount of electricity that your home consumes during the time of daylight hours, and go on buying the right and suitable system size.

Most importantly, it depends on your daylight electricity use and consumption scale that what size of solar panel you need!

Talking about the average household consumption, it is seen that they consume and make use of 18kWh of electricity each and every day.

If you consider yourself as one of those households who only consume and utilize 40% of its power and electricity during the phase of daylight hours, then there is not a single valid point of mounting and installing such a big solar panel system.

For this situation, you can have a 3kW system. Most probably, this kind of solar system will likely to deliver and give the most effective use to you.

What to do During Winter Times When There Is Less Sunlight?

It happens especially during the winter season that home roofs receive less sunlight. So, what to do in this case?

It is largely and extensively because of the shortage number of sunshine hours during the time of winter months that the overall solar panel output comes out to be significantly less.

Individuals are looking for such kind of solar power system that can produce and generate enough amount of electricity and meet their heating needs all in the depths and times of winter.

During winters, average daily electricity consumption is18kWh and daylight use are 7.2kWh. On the other hand, the output of a 5kW system, it is 18kWh for average daily output. And 8.1kWh for Winter daily output.

So, if you are using a 5kW system, then it will have the potential to produce enough electricity during winters and thus be able to power your home.

During winters, it is not wise to prefer smaller system. They do not have enough potential to generate a suitable percentage of electricity in the winter months.

That is why big solar panels are always appropriate. They meet all your seasonal needs and requirements. Large size solar panels can well be used and availed for all seasons.

Is It Right to Add or Incorporate the Element of Battery?

If you have installed a solar panel system and you are planning to incorporate a battery with it, then the system size equation is for sure going to change.

Furthermore, if you have a 6.6kW system, then you will be in need of more and more solar panel systems to charge your battery.

The size system is going to increase and totally depends on the fact of how much battery storage you require!

Further Points While Finalizing a Solar Panel System Unit!Right Solar Panel System

To all individuals out there, if you are still weighing and considering this fact what solar panel system you need, then mentioned points can further help you out.

For that, you have to consider and assess your future electricity needs.

This is the most important consideration from your side.

Like, if you are planning to buy an electric vehicle or you are making plans to switch and shift to electric heating and cooling, then choose a solar panel system in accordance with these factors.

It always turns out to be cost-effective and pocket-friendly if you give your thumbs up regarding buying a larger system. The additional cost is going to be paid back to you.

As soon as you increase and enhance your electricity needs, then you will gradually be in need of big solar panel systems.

Calculating Your Solar Panel Estimate:


To calculate the numbers and predicted amount for energy consumption, you can do these calculations on your own.

From this specific calculation, you can know and hassle-free decide how many solar panels you require!

Have a look at this breakdown and clear your queries.

Firstly, you should know how many kilowatt-hours (kWh) of power or electricity you use per year.

There are a large number of utilities that do offer and serve you with your total power consumption rate for the whole year.

It is on your monthly bill that these figures are written. You can take help and guidance from there.

So, note down your kilowatt-hours consumption for the last twelve months from your monthly electricity bill.

We can give you a rough estimation as well. It is observed that one kWh is equal to 1,000 watts of power that is consumed in an hour.

In other words, if you have got 20 lights right there in your home, then they will be using 50-watt bulbs and one kWh of electricity. Most importantly, average household use and consumer 897 kWh per month.

Interesting Facts on Solar Panel Industry!

You can catch up with more interesting facts on the solar panel industry. Below are the details:

Those countries that make use of the most solar energy, are China, Japan and also Germany and the United States. This solar energy was invented by Edmond Becquerel.

He invented the solar cell. He was the one who determined that light could increase and amplify electricity generation whenever metal electrodes are going to be placed right into a conducting solution.

Lastly, Germany is almost 100% solar-powered.

This country makes use of wind, solar as well as biomass. Moreover, this country had and possess the world’s largest and biggest of all photovoltaic installed capacity until the time of 2014.

And by the time of 2020, it now possesses 49 GW. In addition, this country is at times called with the title of the world’s first and major renewable energy economy.

Frequently Asked Questions:

What Is the Standard Size Range of a Solar Panel?

The standard size range of a solar panel, it is around and about 1.70m x 1.00m. This is the basic dimension that is possessed by an average solar panel.

Rest, you can have solar panels of different sizes. And their measurements differ depending on their size range.

How Many Solar Panels are Required to Power the Average House?

For an average size house, you are going to need a typical looking 5kW solar system. Moreover, this panel type is composed and consisted of 15 to 20 panels.

These solar panels are large enough to run and power the average size house. Furthermore, the number of panels required and needed, they are dependent on other factors too like the factor of electricity usage.

How Many Solar Panels are Required for 1000 kWh Consumption Per Month?

If your house show 1000 kWh consumption on a per month basis, then your house will e in need and demand of 20 and 30 solar panels.

All in all, the exact number varies and changes on a frequent basis. The final number also depends on the overall specifications of your selected and chosen panel model.

Besides, it is fully dependent on the availability of sunshine right at the project site. So, there is no fixed and accurate rule regarding how many solar panels you need!

This is a trial and error method. You can do the calculations and come up with an estimated figure that matches with your consumption needs.

How Many Solar Panels do You Need to Buy for 2000 kWh Per Month Consumption?

If your house is displaying 2000 kWh per month consumption, then the number of solar panels demanded by your home depends on how sunny your home is!

It is seen that an average 2,000-square-foot home, it makes use of and consume approximately 1,000 kWh per month of electricity power. And that turns out to be approximately 32 kWh per day.

What Kind of Appliances are Run and Powered by a 300-Watt Solar Panel?

For a 300 watt solar panel, it can run and operate appliances like that of fans, TV and also LED lights. In addition, energy stored in these solar panels, it is limited and restricted to some extent. You can say that it is limited up to 300 watts.

You need to remember and keep in mind that a 300-watt solar panel, it has the capacity to generate a maximum power or electricity of 300 watts of electricity.


This solar panel industry is quite and extremely big. It is according to the report and stats that the global level solar energy industry, it was pegged at around and about the scale of $52.5 billion in 2018. And by the time of 2026, it is projected to be $223.3 billion.

For more details on the solar panel system size guide, stay tuned with us. We have more facts and figures, calculation methods for you.

Start using this option of generating electricity and share your feedback over here, Moreover, if you are living in a country that remains to stay sunny for an extensive number of hours, then you should use solar panel over there.

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