10kW Solar Power System – Everything to Know

10kW Solar Power System – Everything to Know

Last updated on October 10, 2023

So, you’re thinking about going solar and wondering if a 10kW system is right for your home. Well, you’ve come to the right place.

A 10kW solar power system is a great option for most average-sized homes and can meet nearly all your electrical needs while drastically reducing or even eliminating your electric bill. In this article, we’ll walk you through everything you need to know about a 10kW solar system so you can make an informed decision.

We’ll discuss how much energy a 10kW system will produce, how much you can save, the components involved, and options to choose from. 

You may also want to know; 6.6KW Solar System 


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    By the time you’re done reading, you’ll feel confident enough to decide whether 10kW of solar power is the perfect solution for your home or not. The sun is shining, and savings are waiting—let’s get started!

    What Is a 10kW Solar Power System?

    A 10kW solar power system is a solar photovoltaic system with a rated power output of 10 kilowatts. That’s a pretty sizable system that can generate a lot of free and clean energy from the sun.

    A 10kW solar power system is a collection of solar panels and related equipment that can generate up to 10 kilowatts (kW) of electrical power when exposed to sunlight

    How much will it cost?

    The total cost of a 10kW solar power system can range from $15,000 to $30,000 depending on the components and installation fees in your area.

    However, the good news is you’ll get back much of that cost through energy bill savings and government rebates like the Small-scale Technology Certificates (STCs).

    How Many Solar Panels Are Needed for 10kW?

    To generate 10kW of power, you’ll need quite a few solar panels. Typically, 10kW systems use between 20 to 40 panels, depending on the wattage of the panels.

    Panel Sizing

    For residential systems, panels usually range from 250 to 365 watts. So, using 250W panels, you’d need around 40 panels to reach 10kW. With higher wattage 365W panels, you can get by with only 28 panels.

    The exact number will depend on factors like your location’s sunlight levels and your own energy needs. It’s best to get an estimate from an installer to determine how many panels you’ll require.

    Panel Types

    The two most common types are monocrystalline and polycrystalline. Mono panels are made of single silicon crystals and tend to be slightly more efficient, but also more expensive.

    Poly panels use multiple crystals and are a little cheaper, though they require more space to produce the same output. Either type will work well for a 10kW system.

    Panel Placement

    How the panels are positioned also impacts the total power generated. For maximum efficiency, panels should face south and be installed at an angle of 30 to 40 degrees.

    If limited by your roof pitch, panels can still produce good results within 20 degrees of south and at a 10-to-50-degree angle. The ideal setup is having panels unobstructed by shade, with consistent sunlight throughout the day.

    What Can a 10kW Solar System Run?

    A 10kW solar system is a great size for most homes and can power a lot of your essential appliances and electronics. Here’s what a typical 10kW solar power system can run in your home:

    What Can a 10kW Solar System Run?


    A 10kW solar system can easily power all the lighting in an average-sized house, including LEDs, CFLs and incandescent bulbs. LED lights are the most efficient, so switching to LEDs will allow you to save solar power for other devices and appliances.


    The average refrigerator uses around 1kW per day, so a 10kW solar system can run a fridge and freezer with energy to spare for other appliances.


    You can power a TV, laptops, phone chargers, and other small electronics. Gaming consoles and desktop computers will use more energy, so you may need to limit usage to peak sunlight hours.

    Washer and Dryer

    An efficient washer and dryer can operate on a 10kW solar system, especially if you run the loads in the middle of the day when your solar panels are producing the most power.

    However, try to avoid running the dryer for long periods on hot days when your air conditioner is also running.

    Air Conditioning

    A 10kW solar system may be able to power a small window AC unit for a few hours a day during the summer, but likely won’t run a central AC system for an entire house. Use fans and open the windows when possible, instead of relying only on AC.

    Pool Equipment

    For those with an in-ground pool, a 10kW solar system can run the pump and filter during the day, but may not power heating and cleaning equipment for long periods. Use a pool cover when possible to minimize heat loss and energy usage.

    Cost and ROI of a 10kW Solar System

    When first setting up a solar system, the largest upfront costs are those associated with the solar panels themselves, as well as the inverter that converts the DC power from the panels to AC power for your home.

    You’ll also need mounting equipment, wiring, disconnects, and other balance of system components. Installation labor costs also make up a significant portion of the total. Many homeowners take advantage of the federal solar tax credit to offset some of these costs.

    Savings and Return on Investment

    Once your system is up and running, you can expect to save hundreds per month on your electric bill, depending on utility rates in your area and how much of your home power the system can produce.

    A 10kW system will generate an average of 15,000 kWh per year, which could power a typical home almost entirely.

    The time it takes to recoup your initial investment through energy savings and payback the cost of the system is known as the “return on investment” or ROI. For a 10kW residential solar system, you can expect an ROI of 6 to 12 years. The exact payback period will depend on factors like:

    • System cost and available rebates/incentives
    • Amount of sunshine in your location (more sun means more energy production)
    • Utility rates (higher rates mean bigger savings)
    • Increases in utility rates over time (which will shorten your payback period)

    Choosing the Right 10kW Solar System Components

    For a 10kW system, you’ll want 30-40 panels rated at least 250-330W each. Higher wattage panels take up less space but tend to cost more. Compare different panel brands based on wattage, size, and warranty. Look for panels with at least a 25-year power warranty and product warranty.


    The inverter converts the DC power from your panels into AC power for your home. For a 10kW system, you should choose a string inverter rated at least 10kW or microinverters with a combined rating of 10kW or more. String inverters are more affordable but if one fails the whole system goes down.

    Microinverters cost more upfront, but each one operates independently so the system continues working if one fails.

    Battery (Optional)

    Adding a battery backup allows you to store excess solar energy for use when your panels aren’t producing energy at night or during an outage. Batteries also provide backup power in an emergency.

    Choose a lithium-ion battery rated at least 10kWh for a 10kW system. While batteries increase upfront costs, they maximize your system’s potential and energy security.

    Other components include a charge controller, racking system for panels, combiner box, disconnects, and wiring. Work with a reputable installer to determine what specific components are right for your needs and location.

    They can help you compare options and find the optimal, high-quality parts to power your home for decades to come.


    While it may seem like a big upfront investment, the long-term savings and energy independence make going solar worthwhile. Once installed, you’ll enjoy decades of free, clean power and significantly lower energy bills. The planet and your wallet will thank you.


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      Anything else you would like to ask us regarding our services and offers? Please feel free to get in touch and our friendly staff will assist you.

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      E-Green Electrical is a top tier energy efficiency company based in Sydney. We focus on utilising government rebates to help reduce our clients energy consumption by installing energy efficient solutions. E-Green boasts a rich heritage within the realm of energy efficiency, consistently staying up to date with cutting-edge technologies to deliver optimal results for our valued customers.

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