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4kW Solar System

Why 4kw Solar System is So Popular for Homes in UK?

A 4kW solar panel system in UK is the most commonly used PV system for households owing to its capacity to generate enough electricity for 3 to 5 people. Since the average apartment size for occupants living in a single house varies between 3 to 5 people, a 4kW system is designed to meet the needs of such households. In terms of installation cost, a 4kW solar system cost in the UK typically ranges from £5,000, inclusive of installation charges. 

To install a 4kW solar system, you’ll need an area of 21m² to 28m², typically accommodating around 9-11 solar panels, each of 375-435.  However, if you opt for a 4kW solar system with a battery, the price can increase to £8,000 – £9,500.  . 

Get our free quotation and an online survey by simply leaving us a message or filling out our quotation form. Your system will be installed by an MCS Certified installer at a reasonable cost without compromising on the quality of the products and efficiency of the system.

4KW Solar System in UK

4kw Solar System Price

The preliminary investment for a 4 kW solar system without a battery in the UK typically falls within the range of £5,000. However, 4kw solar system cost may vary slightly based on factors like the quantity and dimensions of the solar panels, the brand of inverters and the type of mounting structure selected. Choosing 4kw solar panels system with battery in UK can escalate the overall cost to a range of £8,000 to £9500. It is noteworthy that the average annual savings associated with a 4 kW solar system in the UK is approximately £860. When we calculate the average savings over 25 years, it amounts to over £21,500.

Key Components of a 4KW solar System

Solar Panels

Regardless of the system size you’re considering for installation, the first consideration that comes to mind for everyone is the brand and size of the panels. opting for the right panels can enhance the overall efficiency of the system. as per the number of panels concerned, the space available and the size of the panel can affect the overall number of panels.

4kw solar panel system

How many solar panels are required for a 4kw solar System?

Typically, for domestic usage, 375-435watt panels are commonly used. With this in mind, a 4kW solar system would typically require around 9-11 panels panels. However, the number of panels needed can be adjusted if your roof has limited space. In such cases, higher wattage panels can be utilized, reducing the number of panels to 7 or 8. It’s important to note that the wattage of the panels also influences their price. Panels with higher wattage capabilities tend to be priced higher due to their increased energy production potential.

Wattage No. of Panels

4kw Solar Inverters

An inverter plays a crucial role in optimizing the performance of a solar PV system, so it must be chosen carefully. A 4kw solar inverter, when carefully selected, can efficiently convert the DC current produced by solar panels into AC for running home appliances. MAK Energy is always ready to assist customers where they need it. Here’s a list of the best 4KW inverters, complete with model names and descriptions.

Here Are Some of The Best 4kw Solar Inverters on The Market:

Brand Best Description
Fox Ess
High-quality, reliable inverter with a long warranty.
Versatile inverter that can be used for a variety of applications.
Advanced inverter with smart features that can help you save money.
Popular and affordable inverter with a good reputation.
Advanced inverter with smart features that can help you save money.
Good value for money inverter with a wide range of features.

Batteries (optional)

Having energy backup makes you more secure and energy independent even during long hours of power outage.  When it comes to pairing a battery with a 4kW solar system, a 5kWh solar battery is commonly used and considered the best option for a household of 3-5 people in the UK. There are numerous 5 kW solar batteries available in the market. You can select one based on your budget. A 4kW solar system with battery cost in UK may be higher, but it offers the valuable advantages of energy independence and freedom from higher monthly energy bills.

4kw solar system price with Different Batteries

Battery Brand Cost Battery Size
Fox Ess
LG Chem

Benefits of investing in a 4kW Solar Panel System?

Solar systems, regardless of their size and capacity, offer various benefits to the owner, including savings on energy bills, clean electricity production, energy independence, increased property value, and more. Here is a list of benefits you can enjoy by installing a 4KW solar system at your home.
  • Payback period of approximately 10 years after installation
  • Nearly free electricity production for the next 15 years
  • Increased property value
  • Enhanced energy independence
  • Minimal maintenance expenses

How much electricity does a 4kw solar system produce per day?

In general, a 4kW solar system in UK generates around 15kWh to 20 kWh of electricity per day. Calculating the accurate amount of electricity a 4kw system can produce can be challenging. This is because the efficiency and performance can vary based on several factors, including the quality of the 4kw solar panel kits, the equipment used in the system, the installation location and the number of sunlight hours the panels receive.

List of Appliances that can a 4kw solar system run

A 4KW solar system is the ideal choice for many homeowners in the UK. This system has the capacity to power a wide range of average home appliances:
Washing machine Water Heaters Oven


Most UK households consist of approximately 3-5 people, making the 4kW solar panel system the most commonly used in the country. This system size is renowned for its cost-effectiveness, as it produces ample electricity throughout the year, paving the way towards energy independence.

In the UK, the 4kW solar system price with battery is slightly higher compared to the grid-tied version, but it offers the advantage of significantly reducing reliance on the grid for electricity. The 4kW solar system with battery price typically falls between £8,000 and £9,500. Alternatively, if you opt for a 4kW solar system without a battery, the cost will be more affordable, starting from just £5,000. It is important to consider that the total cost can vary depending on the type of 4kW inverter used.


The prices are subject to survey, the estimated savings are based on KWh production which is dependent on number of factors including system size, location, orientation, and angle.


How Much Does a 4kw Solar System with Battery Cost In UK.

A 4kW solar system with battery in typically falls between £8,000 and £9,500. Despite their relatively high cost, incorporating a battery into your system brings numerous benefits. It allows you to harness and utilize approximately 30% more solar energy, making you more self-sufficient in terms of energy.  

How Much Will A 4kw Solar System Save?

On average, a 4kW solar panel system can save you approximately £860 every year. When we calculate the average savings over 25 years, it amounts to over £21,500. By installing a 4kW solar system with battery in UK, you can experience even greater savings. With reduced reliance on the grid, the amount of electricity you need to draw from it decreases significantly, leading to substantial cost savings.

How Many Batteries Are Required for A 4kw Solar System?

The number of batteries required for a 4kW solar system depends on various factors, including the size of your house, your daily energy consumption and the amount of sunlight your house receives each day. On average, a 5.2 kWh solar battery is installed with the 4 kW system. However, if your nighttime consumption is higher, you can add a 10 kWh battery or a couple of 5.2 kWh batteries according to your requirements.

How Much Electricity Can A 4kw Solar System Produce?

A 4kW solar panel system has the capacity to generate a maximum of 4,000 kWh of electricity per year. However, in general, it typically produces between 3,500 kWh and 3,750 kWh of energy annually. On a bright and sunny day, a 4kW solar system in UK can generate approximately 16 kWh of electricity. Several factors can influence the actual energy production of a 4kW solar panel system.

 Here are some of the key factors that can impact its performance.

Efficiency of the solar system components

Orientation of the panels

  Location of your house

 Time of year


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