A realistic look at the benefits and considerations of adding a battery.
Adding battery storage to a solar PV system allows you to store excess electricity generated during the day and use it later, typically in the evening. While this increases self-consumption, it also adds significant cost. So, is it actually worth it?
Without a battery, a large portion of the electricity your solar panels generate is exported to the grid. A battery allows you to use more of that energy yourself, which can reduce your electricity bills.
Batteries give you more control over your energy use and can provide backup power during outages (depending on how the system is configured).
As electricity prices rise and smart tariffs become more common, storing your own energy can become increasingly valuable over time.
Some battery systems can provide backup power during power cuts, which can be valuable in rural areas or during storms.
Batteries add a significant cost to a solar installation — typically between £4,000 and £8,000 depending on size and brand. This increases the overall payback period of the system.
Most home batteries are warrantied for 10 years, but their capacity gradually reduces over time. It’s important to factor this into your long-term calculations.
Batteries make the most financial sense if you use a lot of electricity in the evenings. If most of your usage is during the day, the financial benefit may be smaller.
For many households, adding a battery improves the overall value of a solar installation — especially if you value energy independence and want to maximise self-consumption.
However, from a purely financial perspective, it often takes longer to pay back the additional investment compared to solar panels alone. The decision usually comes down to your priorities.
Use our Solar Estimator to see realistic costs and payback times for your property.