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4kW Solar System

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Grid-tie
4 kW

4 kW Roof-top Grid-tie system with microinverters

  • System size4kW
  • Installation typeRoof-top
  • System typeGrid-tie
  • Inverter typeMicroinverter
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Grid-tie
4 kW

4 kW Roof-top Grid-tie system with microinverters and battery

  • System size4kW
  • Installation typeRoof-top
  • System typeGrid-tie
  • Inverter typeMicroinverter
FREE SHIPPING
Grid-tie
4 kW

4 kW Roof-top Grid-tie system with string inverter

  • System size4kW
  • Installation typeRoof-top
  • System typeGrid-tie
  • Inverter typeString
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Off-grid
4 kW

4 kW Roof-top Off-grid system with microinverters and battery

  • System size4kW
  • Installation typeRoof-top
  • System typeOff-grid
  • Inverter typeMicroinverter
FREE SHIPPING
Off-grid
4 kW

4 kW Roof-top Off-grid system with string inverter and battery

  • System size4kW
  • Installation typeRoof-top
  • System typeOff-grid
  • Inverter typeString
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Hybrid
4 kW

4 kW Roof-top Hybrid system with string inverter and battery

  • System size4kW
  • Installation typeRoof-top
  • System typeHybrid
  • Inverter typeString
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Grid-tie
4 kW

4 kW Ground-mounted Grid-tie system with microinverters

  • System size4kW
  • Installation typeGround-mounted
  • System typeGrid-tie
  • Inverter typeMicroinverter
FREE SHIPPING
Grid-tie
4 kW

4 kW Ground-mounted Grid-tie system with microinverters and battery

  • System size4kW
  • Installation typeGround-mounted
  • System typeGrid-tie
  • Inverter typeMicroinverter
FREE SHIPPING
Grid-tie
4 kW

4 kW Ground-mounted Grid-tie system with string inverter

  • System size4kW
  • Installation typeGround-mounted
  • System typeGrid-tie
  • Inverter typeString
FREE SHIPPING
Off-grid
4 kW

4 kW Ground-mounted Off-grid system with microinverters and battery

  • System size4kW
  • Installation typeGround-mounted
  • System typeOff-grid
  • Inverter typeMicroinverter
FREE SHIPPING
Off-grid
4 kW

4 kW Ground-mounted Off-grid system with string inverter and battery

  • System size4kW
  • Installation typeGround-mounted
  • System typeOff-grid
  • Inverter typeString
FREE SHIPPING
Hybrid
4 kW

4 kW Ground-mounted Hybrid system with string inverter and battery

  • System size4kW
  • Installation typeGround-mounted
  • System typeHybrid
  • Inverter typeString

4kW solar system

Picking together the components of a solar system can be challenging for a newcomer. Here in this section of our website we offer precombined systems that are ready to be installed.

How a 4kW solar system is used

The most popular type of configuration is a grid-tie system. Solar panels power your appliances, but you can lean back on electricity from the commercial grid at any moment. You can use commercial electricity on cloudy days and at night when rates are generally lower anyway. Excess solar energy can be sold into the grid for credits from your utility that are used to cover your bills.


How much electricity does a 4kW solar system produce? On a good sunny day a 4 kW system makes around 4 kWh of energy in an hour. The production is influenced by the following factors:

  • Weather. On cloudy days irradiance of panel falls and the output decreases by 20-40%;
  • Positioning and angle. In the northern hemisphere you want your panels facing south, inclined at 30 to 45 degrees;
  • Temperature. Panels work best when it’s cold and sunny. Their performance drops when it starts getting over 77 °F;
  • Shading. Shade impacts different panels differently, but they lose energy no matter what.

So how much does a 4kW solar system produce per day? That depends on location and more specifically the number of peak sun hours in your state. For instance, in California the average number of sun hours per day over the year is 5.6, whereas in New York it varies from 3 to 3.5. Thus in Los Angeles a 4k solar system makes 4 kW × 5.6 h = 22.4 kWh per day on average throughout the year. Keep in mind, however, that in summer panels produce 50% more energy than in winter.


A 4 kW solar system can also be used in a house without any connection to the grid — it’s called an off-grid system. It is imperative to have batteries as a backup. Your appliances will draw the power from your battery bank at night and on gloomy days when panels don’t generate enough. The option of a net metering is not available though, and the system costs a bit more because of the batteries.

4kW solar system cost

Panels have been continuously getting cheaper over the years. They were 80% more expensive 10 years ago. Not only that, but the incentives from the government also make a switch to solar much cheaper. If you live in the right state and if you’re lucky, you can basically get your system for half-price by applying for different solar programs.


So how much does a 4kW solar system cost? Generally, it would cost around $10,000–15,000, including installation services and shipment. However, Solar Tax Credit, a federal program that is available to all Americans, allows you to reduce the costs by 26% in 2022, bringing the average cost to $7,000–12,000.


A lot depends on the panels though. There are cheap models and there are premium-class expensive ones. A 4kW solar system price is going to be the lowest if you go for Chinese panels. The brands that you are looking for are Trina, Jinko, JA Solar. American panels are a bit more expensive, but the quality is higher. Brands like Canadian Solar, Silfab and Aptos Solar represent North America on the world’s market. The most expensive panels come from companies like Panasonic, Sunpower, LG. While the 4 kW solar system cost is going to be higher than average with these panels, they come with great warranties, perform better in most circumstances and last longer.

What 4kW solar kit includes

The components of your solar system may vary depending on the design that you choose. Grid-tie system is the most simple one. The required parts are:

  • solar panels;
  • grid-tie inverter.

While you can add batteries to your sub electrical panel for critical loads, you should keep in mind that during power outages all grid-tie inverters shut down. It means that a grid-tie 4kW solar panel system won’t help you during a blackout. What will help you though is a hybrid system. It includes:

  • solar panels;
  • hybrid inverter;
  • battery;
  • charge controller.

Sometimes hybrid inverters have a built-in energy storage and a charge controller. Hybrid inverters ensure uninterrupted power supply for your home: if a power outage happens, the inverter just switches your house to battery support.

Sometimes, however, there are no power lines to speak of. That’s when an off-grid system comes in handy. It includes:

  • solar panels;
  • off-grid inverter;
  • batteries;
  • charge controller.

Keep in mind that the average size of a system in the US is 5–6 kW — such a system covers about 80%-90% of the energy needs of an average American house. A 4 kilowatt solar system might be enough for small houses, but you would need more power for a larger one.

Frequently Asked Questions

How do I choose the right system size?
Your utility bills contain the energy consumption data for your home. All you need to do is divide the daily figure by the number of peak sun hours in your area. The result will be a gross estimate of a system size needed to offset 100% of your energy needs. Please refer to our article on sizing solar panel systems for more detailed instructions.
How do I know if a system is good for my house?
You can browse through our catalog and pick a system with desired power output and functionality. Our engineer with 20+ years of experience will adapt it based on the information you provide. He will take into account your location, roof pitch, house orientation and other factors. You don’t need to know a single thing about solar – we will support you at every stage.
Which system (grid-tie, off-grid or hybrid) will work for me the best?
It is impossible to give a good recommendation without knowing any details, but we can share the general principles. A grid-tie system is the standard choice: it is the most affordable and lets you take advantage of net metering. You need an off-grid system if the grid is unavailable or full independence is desired. A hybrid system is a mix of the two, performing equally well with and without a grid connection. You can find a more nuanced take on the difference among the three types in our article.
Does a solar system include all that is needed for installation?
Yes, our systems include absolutely all components. You won’t need to buy any extra parts to install it and start generating power.
Will you install the solar panel system for me?
Currently we do not provide installation services. You will need to contact an independent solar installer.
Do you offer a warranty for your solar panel systems?
All components of our systems come with a manufacturer’s warranty. We also stand behind the work of our engineers who configure the systems and guarantee full compatibility.
How can I get my system?
We work with the top freight carriers like XPO, FedEx, ODFL, R&L, etc. We also offer a free pickup option so that our clients could get the equipment cheaper and faster. Note that pickup is dependent on the availability of equipment in our fulfillment centers, and may not be feasible in your location.
Do deliveries of solar panel systems take longer?
We deliver our systems as fast as the rest of our equipment. Typically it takes 5 to 7 days.
Do you have all the displayed systems in stock?
Yes, we offer full transparency and update the availability of items in real time.
What is the benefit of buying a solar panel system compared to buying all the equipment element by element?
Our systems are configured by an engineer with more than 20 years of experience. We will adapt the kit to your conditions and ensure compatibility.
Does a solar panel system come with a plan or a manual?
The equipment manufacturers normally provide user manuals for their products. These can be accessed via our website or the official websites of the respective manufacturers. Aside from that, we do not provide any other materials, but we're ready to consult you along the way.

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