Battery Storage

Battery storage is a system that can store electricity so that you can use it another time. It can also be used to draw power from the grid when it is at a cheaper rate than normal, allowing you to save money.

Battery storage offers you the flexibility to choose when you buy or use your electricity, meaning that you can use the energy you generate at mid-day in the evening, or store off-peak, cheaper electricity for use later. There are three main ways you might install it:

At the same time as new solar panels

Many people choose to add a battery when they get solar panels fitted. This means your installer can design the system as one package, making sure the panels and battery work perfectly together. It’s often the most cost-effective option.

Adding to an existing solar system

If you already have solar panels installed, you can still add a battery. A certified installer can connect a battery to your existing system so you can start storing the energy you generate to use when you wish.

Installing a battery on its own

Even without solar panels, a battery can still help you save money as you can charge it overnight on cheaper off-peak electricity tariffs and use that energy when prices are higher. This can reduce your bills and help protect you from peak-time energy prices.

Excess energy generated by your renewable technology systems, such as solar panels, can be stored in a battery for later use.

Battery storage systems often work alongside solar power, whether added to an existing installation or fitted as part of a new installation. It ties into the idea of using your home as a ‘power station’.

For example, you can charge your battery when the sun is shining throughout the day, then once the sun has gone down, you can use the energy stored in your battery to power your oven, washing machine or turn on your lights – all for free.

To choose the right battery storage system for your home, you will first need to consider how much energy you want your system to be able to store, and how much energy it can deliver at once. For 2025, the maximum power the battery can accept when charging, for an MCS certified battery storage system, has been 5.95kW.

In 2025, the average cost for a battery storage installation is just over £8,900.

The lifespan of a battery will depend on the model, so be sure to look for this information before you make a decision.

It is common for a battery storage system to be connected to solar panels. This gives you flexibility in how you power your home. The excess electricity your solar panels generate can either be sold back to the grid or stored in your battery. If this is something you are considering, make sure to check that your chosen battery storage is compatible with your existing or potential solar panel setup.

A battery’s lifespan depends on its type and how often it’s charged and discharged fully. Manufacturers usually provide an estimated lifespan in years or the number of full charge cycles estimated.

Most battery storage systems monitor battery health and will alert you when a replacement is needed. Some companies also offer leasing or replacement options for worn-out batteries and handle safe recycling or disposal.

If you also have solar panels, you can expect to replace your battery at least once during the life of your solar panel system.

MCS works with the wider industry to empower consumers to make the right choice in how they power their homes. Find more information and resources for battery storage here:

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