A guide to battery storage
Many renewables companies at the moment are selling batteries with solar PV systems every time. We believe best practice is more nuanced than that – and that some customers are being encouraged to have battery storage where it’s not in their best interest.
Investing in battery storage alongside your solar panels can help you save money in the long run—especially if you take advantage of cheaper off-peak energy rates (time-of-use tariffs). However, there are a few challenges to consider.
Firstly, batteries come with a high upfront cost. Even though their prices are slowly dropping, the initial investment is still significant. You’ll need to balance this cost against the energy savings you expect to make over time. Also, batteries lose efficiency as they age, meaning their storage capacity decreases. This gradual loss in performance could lead to replacement costs down the line.
Another important factor is where to install the battery in your home. New UK guidelines stress the need for safe and proper installation, often requiring a professional to check that you have a good place to site the system. This can be tricky in older or smaller properties where room is limited. While some homeowners might consider placing the battery outside to save indoor space, this isn’t always ideal. Temperature—whether too hot or too cold—can affect the battery’s performance and lifespan, so choosing the right spot is essential.
Despite these challenges, using a battery to store your solar-generated electricity can still be a smart move. It helps you use more of your own renewable energy, reducing your reliance on the grid and avoiding higher costs during peak times. With more time-of-use tariffs available, you can save money by using stored energy when electricity prices are at their highest.
​While the benefits of greater energy independence and potential savings are appealing, UK homeowners should carefully consider the high upfront costs, gradual battery degradation, installation challenges, and proper placement before deciding on a battery storage system.
