What Is a Battery Storage System for Homes?

With energy prices changing and more households generating their own renewable electricity, homeowners are looking for better ways to manage the energy they use. A house battery storage system provides one option, storing electricity so that it can be used later rather than immediately.

At Swift Renewables, we design and install domestic battery storage and solar PV systems for homeowners across the South West. In this article, we explain what home battery storage is, how it works, and whether installing a battery system could benefit your property.

What Is Home Battery Storage?

Home battery storage is a system that stores electricity for use at another time. Rather than electricity having to be consumed at the moment it becomes available, a battery allows you to retain energy and draw on it when your household needs it.

Battery storage is particularly useful alongside solar PV. Solar panels generate electricity during daylight hours, but that does not always correspond with when a household consumes the most energy. A battery can capture excess solar generation during the day so that you can use more of it later, such as at night or during days with low sunlight.

Modern domestic battery storage typically uses lithium-ion technology. These batteries store DC electricity, while an inverter converts it into AC electricity that can be used by appliances throughout the home.

How Does a Battery Storage System Work in a Home?

A home battery charges when electricity is available and discharges when that stored electricity is required. When paired with solar PV, the battery can charge using excess electricity generated by the panels rather than immediately sending that electricity back to the grid.

The basic process works like this:

1. Solar PV panels generate electricity during daylight hours
2. Your home uses the solar electricity it needs
3. Surplus electricity can be directed into the battery
4. The battery stores this energy until it is required
5. An inverter converts the stored DC electricity into usable AC electricity
6. Your home can draw from the battery when solar generation is insufficient
7. Any remaining surplus may be exported to the grid once the battery is charged

House battery storage can also be installed alongside an existing solar PV system. This means you do not necessarily need to replace your current panels to start storing more of the renewable electricity you generate.

What Is a Home Battery Used For?

One of the main uses of domestic battery storage is increasing how much solar-generated electricity you consume yourself. For example, your panels could generate surplus electricity around midday while you are away from home, which can then be stored for use when you return in the evening.

A battery can also be charged using grid electricity. With suitable equipment and an appropriate flexible electricity tariff, this can allow you to charge at cheaper times and use that stored electricity when grid prices are higher.

Some battery systems can provide backup electricity during a power cut, although this capability depends on the equipment and how the system has been designed. If backup power is important to you, it should be considered when choosing and specifying your system.

Maximising the Potential of Your Solar PV System

Without battery storage, excess solar electricity that your home cannot use immediately will generally be exported to the grid. While eligible households can receive payments for exported electricity, storing some of that surplus can help you make greater use of the energy produced on your own roof.

At Swift Renewables, we design solar PV and battery systems around the individual property and its energy requirements. This helps us determine how solar generation, battery capacity, and household consumption can work together.

Benefits of Battery Storage Systems for Homes

The exact benefits of domestic battery storage will depend on your household, electricity consumption, solar installation, chosen battery, and energy tariff. A correctly designed system can give you greater flexibility over where your electricity comes from and when you use it.

Potential benefits include:

• Storing surplus solar electricity for later
• Increasing your use of home-generated renewable energy
• Reducing reliance on electricity purchased from the grid
• Reducing your exposure to changing energy prices
• Making greater use of a solar PV installation
• Using app controls with compatible flexible electricity tariffs
• Increasing household energy independence
• Taking advantage of developing battery and inverter technology

For homeowners considering solar PV, combining panels and battery storage from the outset also means the complete system can be designed around the property’s energy requirements. Existing solar PV owners can still explore adding battery storage separately.

Are Battery Storage Systems Safe?

Domestic batteries are designed to store significant amounts of electrical energy, so appropriate equipment, system design, installation, and commissioning are essential. Homeowners should therefore use an experienced installer who understands both the battery technology and the electrical infrastructure around it.

Battery location is another important consideration. Your installer will need to determine a suitable position based on the equipment being installed and the characteristics of your property, rather than simply placing the battery wherever there happens to be free space. This can be important when considering protection against the elements, accessibility, and noise levels.

Like other electrical equipment, battery systems should be installed according to the relevant requirements and manufacturer instructions. At Swift Renewables, we test and commission our systems following installation and provide customers with the information needed for their new system.

Is a Battery Storage System Right for Your Home?

There is no single battery storage system that will suit every property. The right setup depends on how much electricity you consume, when you use it, whether you already have solar PV, and what you want the system to achieve.

Before choosing domestic battery storage in the UK, it is useful to consider:

• Your average household electricity consumption
• Whether you already have solar panels
• How much surplus electricity your solar PV system generates
• When your household typically uses the most electricity
• Whether you use, or plan to use, a flexible electricity tariff
• The space available for suitable battery equipment
• Whether backup power is important to you
• Your budget and expected long-term savings

Battery capacity also needs careful consideration. Installing a larger battery does not automatically mean greater savings, particularly if you rarely generate or purchase enough surplus electricity to charge it. Matching the system to your actual energy use can therefore be more valuable than simply choosing the highest available capacity.

Understanding Battery Lifespan

Battery performance changes gradually over time as the system goes through repeated charging and discharging cycles. At Swift Renewables, we advise that a well-maintained lithium-ion battery can typically last around ten years, with its usable capacity gradually reducing during that period.

For example, a battery capable of storing 10kWh when new may have less available capacity after a decade. How the battery is used can influence this degradation, which is another reason to choose a system that has been appropriately specified for your household.

Domestic Battery Storage Systems From Swift Renewables

A battery storage system for homes gives households a way to store electricity and decide when to use it, making it a particularly useful companion to solar PV. With the right design, domestic battery storage can help you use more home-generated electricity, reduce grid reliance, and gain greater control over household energy.

At Swift Renewables, we install tailored solar PV and battery storage systems for homes across the South West. Whether you already have solar panels or are considering a complete home energy system, we’re here to help. Get in touch today and we’ll discuss your options.

Explore our domestic battery installation for a residential property in Backwell Common >

Check out our guide to residential renewable energy and choosing the right installer >

Find out more about the maintenance requirements of solar PV in the UK >