What Size Battery Storage System Do I Need for My Home?
Your Guide to Choosing the Right Capacity with Spike Electrical
As battery storage becomes more popular among UK homeowners, one of the most common questions we hear at Spike Electrical is: What size battery do I actually need for my home? Whether you're planning to add storage to an existing solar system or starting from scratch, choosing the right capacity is key to maximising your energy savings and system performance.
In this blog, we explore the factors that determine home battery size, the typical capacities available, and how our expert team can help you make the right decision.
What Affects the Size of a Home Battery System?
When calculating the ideal battery capacity for your property, several factors come into play:
Your Solar Array Size -larger solar PV systems generate more surplus electricity, which means more energy can be stored.
Daily Energy Usage - understanding how much electricity your household consumes, particularly during evenings and early mornings, will shape your storage needs.
Tariff Type - are you on a time-of-use tariff? Battery storage can help you avoid peak rates by discharging stored energy when it’s most expensive to buy from the grid.
Backup Requirements - do you want your battery to power just essentials during an outage, or your whole home?
At Spike Electrical, we carry out a full assessment of these factors to recommend a battery system that aligns with your lifestyle and future energy goals.
Typical Battery Sizes for UK Homes
Most residential battery storage systems fall between 5kWh and 10kWh in capacity, although larger options are available for bigger homes or households with higher energy demands.
To give you an idea:
5kWh can typically run lighting, internet, and appliances for a few hours in the evening.
10kWh is suitable for powering essential loads overnight and providing basic backup during outages.
We often advise homeowners not to over-invest in oversized batteries unless future expansion (like adding EV chargers or more solar panels) is planned.
AC vs DC-Coupled Systems: What’s the Difference?
AC-Coupled Systems are ideal for retrofitting alongside existing solar installations. The battery is connected via its own inverter, making installation simpler.
DC-Coupled Systems are more efficient and cost-effective when installed at the same time as solar PV, as both use the same inverter.
At Spike Electrical, we design systems based on your current setup, budget, and long-term plans to ensure the right configuration is selected.
Our Process: Tailored Battery Storage from Spike Electrical
We don’t believe in one-size-fits-all solutions. Instead, our qualified electricians take a consultative approach:
Energy Profile Assessment - we analyse your usage patterns, solar generation, and property characteristics.
System Design - we recommend the right size and type of battery based on your goals.
Professional Installation - our team fits your system safely, efficiently, and in full compliance with UK regulations.
Ongoing Support - we offer maintenance and performance monitoring to ensure your battery continues working at its best.
With access to leading battery technologies and deep technical expertise, we make it easy to future-proof your home with the right storage system.
Looking for Expert Advice on Battery Storage Size?
Contact Spike Electrical today for a personalised assessment and no-obligation consultation. We’ll help you find the perfect battery capacity to power your home efficiently and sustainably.