How Many Batteries Do I Need?

How much battery storage you need really depends on two things. How much energy you consume, and how much you produce.

Every home is different, so there is no single right answer. But there is a really good rule of thumb.

Key Takeaways

• Start a little smaller. Battery storage is a sizeable part of the total cost of a solar install.
• Run it for a year. You will then have real data on how you use energy.
• Then decide. You can make an educated choice about adding more.

What Decides Your Battery Size

Your battery stores the energy you don't use straight away. So the right size depends on how much spare energy your panels make, and how much you use in the evening and overnight.

A home that uses a lot in the evening, or charges an electric car, will usually benefit from more storage than a home that is empty all day.

Why We Recommend Starting Smaller

Battery storage is quite a sizeable investment within a solar install. So we recommend starting a little bit smaller.

Run it for a year and you will have proper data on how your home uses energy through every season. Then you can make a really educated decision about whether the extra cost of more storage will give you a meaningful return.

Most modern home battery systems can be extended later, so starting smaller doesn't close any doors.

Already Have Solar Panels?

If you already have panels, you can still add a battery. Our guide Should I Add A Battery To An Old Solar System? explains how it works with the Feed-in Tariff.

You can read more about our home battery storage and home battery installation.

Get The Right Size For Your Home

Book a discovery call and we will look at your usage and help you choose a sensible starting point. No pressure. Just clear advice.