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How Much Power Does a 15kW Solar System Produce per Day?

Tim Carter
Written by Tim Carter Last Updated: September 7, 2022

A typical home in the US needs between 20 and 25 solar panels to cover the home’s electricity needs. This system typically costs $20,000. However, the exact number of panels your home needs depends on how much electricity you need, where you live, and how much electricity your solar panels can generate. So how much power does a 15kw solar system produce?

The 15kW solar array is suitable for commercial buildings because it can produce a daily average of 60kWh. It may be appropriate for residential customers if they have sufficient space and high power usage patterns. 

Electricity consumption varies from one house to another based on the number of devices and the amount of electricity they need. This determines the number of solar panels you need for your home, which, in turn, determines how much you need to spend on the overall installation.

The more energy you need, the more panels you will have to install.

Geographical location and the characteristics of each panel are some key factors determining the number of solar panels you will need.

For example, if you live in Massachusetts, you will need more panels to get the same solar output as you would in California with fewer panels.

Table of Contents

How Much Power Does a 15kW Solar System Produce per Day?

The 15kW solar system is a fairly large power-generating unit that is suited to commercial facilities.

So how much power does a 15kw solar system produce?

A 15 kW solar system may be suitable for residential customers as long as you have roof space and consistently high energy consumption patterns.

This solar array would comprise 40 to 50 solar panels (depending on their power) and can generate an average of 60kWh of electricity per day.

Is the 15kW Solar System Right for You?

To help you decide if this is the right sizing system for you, you need to determine your average daily power consumption.

You can find this information on your most recent quarterly utility bill.

If your average daily consumption is between 50 and 70 kWh The 15kW system would fit well.

To ensure you are maximizing the performance of your solar system, review your current electricity consumption habits.

After you have identified your appliances that use a significant amount of energy, such as a washing machine, dishwasher, dryer, etc., create a plan to ensure that these devices run at sunrise.

How Many kWh Does a House Use Per Year?

Depending on the devices you use, the amount of energy they require, and how often you use those devices regulate the amount of energy you spent throughout the year.

Devices may include televisions, refrigerators, lamps, air conditioners, microwave ovens, kitchen appliances, chargers, and other devices that require electricity to operate.

Just for your reference, an average American home uses 10,715 kWh of energy per year.

Rooftop solar panels can provide this electricity and offset all electricity consumption and bills.

To find out how much you normally spend yearly, check your utility bills for the previous year..

How Many Watts Does an Average Solar Panel Have?

The performance of a panel is its nominal performance; the amount of energy that a panel produces in good condition. Most solar panels are 250W to 400W.

What Is a Solar PV System Production Ratio?

Solar PV system production ratio is the ratio between the estimated energy production over time (kWh) and the actual size of the system (W).

A 1:1 ratio is difficult to achieve because every solar system depends on the amount of sunlight it receives, which varies significantly from one area to another.

Let’s see an example.

A 10 kW system can produce 14 kWh of energy per year, and its production ratio is calculated as 14:10, which is 1.4.

Most solar cell systems in the US have a production index of 1,3 to 1.6.

The following factors are important in calculating the number of panels you would need for your home:

Number of Panels = System Size/Output Ratio/Panel Power

Hours of sunlight in your area also play a role in the number of solar panels you would install. Different regions have different hours of sunshine depending on the season.

The size of your roof is also important if you want to install a solar system.

You can calculate how many solar panels to buy for your system by considering your energy use, the energy output of the solar system, the size of your roof, and the hours of sunshine in your area.

For example, a 6kW system of 250W panels will require 24 panels, while a 3kW system will require 12 panels.

The energy use in a home can depend on how many family members live there. For over five people, a 6kW solar panel is ideal, while for four people, a 5kW panel is sufficient.

However, most families have three or fewer people, and in these types of homes, a 4kW system is most common.

With a daily energy consumption of 4kWh, 16 solar modules, each with 250W, would be required for 100% of the power supply.

4000 Wh / 250 W= 16 solar modules

Companies that produce solar modules have their products in different dimensions.

Therefore, the spaces they occupy vary.

As roof capacity is limited, there is a maximum number of solar panels that your roof can accommodate.

Modules with different wattages also have different dimensions.

For example, 16 modules of 250 W will need 25.6 m2, while 12 350W panels require 22.8 m2.

An average fridge in the US uses about 57 kWh of energy monthly, while a freezer uses about 58 kWh and together 115 kWh consumed.

This would require 3 or 4 average solar panels of 100W.

A panel in the sun for at least 8 hours will generate approximately 1kWh daily, which equates to 30kWh monthly.

However, if you use a more powerful panel, say 300W, it would produce 2.5 kWh per day with the same amount of sunlight. This corresponds to the monthly energy production of 75 kWh.

To power the same cooling system, two panels would produce 150kWh per month.

That leaves you with excess electricity that you can use elsewhere.

A 500W solar panel would produce about 4 kWh per day under the same conditions.

In a month, a single panel would be enough to power the same fridge configuration that produces 120 kWh of electricity per month.

Depending on where you are and how many hours of sunshine your solar panels are getting each day, you can calculate how many solar panels are enough to power your entire home.

This is where Project Sunroof can help.

What is Project Sunroof?

Project Sunroof uses Google images, 3D models, shading calculations, weather data from the National Renewable Energy Laboratory (NREL), information on electricity tariffs from Clean Power Research, scientific energy research, federal, state, and local government information, and utility websites and relevant government agencies.

Project Sunroof can help you get an estimate of how many solar panels you would need to power your home, whether your roof has sufficient space to house your solar system, and how much it would cost you to install such a system.

However, Google warns you should always check with the solar installation company of your choice because their tool can give a different estimate of solar energy production compared to a solar company.

The reason for this is simple: solar energy production estimates depend on many factors, including shade.

Sunroof Project’s mapping data won’t show you recent tree growth or removal, so it cannot be 100% accurate.

For that reason, contact your solar company to get an accurate estimate.

Also, you should know that the number of solar panels you can install on your roof is technically unlimited (as long as you have sufficient space), some utility companies limit the amount of electricity a grid-tied solar system can generate.

Final Thoughts

A 15kW solar system will offset approximately 10,000 pounds of carbon dioxide per year.

Commercial buildings can benefit from the 15kW solar array’s ability to produce an average of 60kWh per day.

If residential customers have enough roof space and high power usage patterns, it might be appropriate for them as well.

Depending on the number of devices and their power consumption, different houses will use different amounts of electricity.

This determines the number of solar panels you require for your house, which determines the cost of the installation.

Solar panels in the southern United States will produce more energy than solar panels in the northern United States.


Tim Carter
Tim Carter

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