Solar panels can be a great way to generate electricity at home, but one question comes up time and time again: Do you actually need a battery storage with solar panels?
The short answer is not necessarily.
A solar PV system can generate electricity without battery storage. However, adding a battery can allow homeowners to store some of the electricity their panels generate during the day and use it later, potentially increasing the amount of solar energy they use themselves.
For some households, battery storage could make sense. For others, the additional upfront cost may not provide enough benefit to justify installing one.
So how do you decide?
This guide explains how solar batteries work, when they could be useful, what to consider before buying one and how homeowners across the UK can find local solar installers.
What Does a Solar Battery Do?
Solar panels generate electricity when there is daylight.
The problem is that many households don’t necessarily use most of their electricity during those daylight hours.
For example, your solar panels could be generating electricity while you are at work. By the time you return home, solar generation may have fallen considerably, but your electricity use could be increasing.
A battery provides a way of storing some of that unused electricity.
A typical system works something like this:
Solar panels → Home → Battery → Home/Grid
During the day, your solar panels generate electricity.
Your home uses the electricity it needs first. Depending on the system, surplus electricity can then be stored in a battery for later use.
In the evening, the stored electricity can potentially be used to power appliances and other household electrical loads.
Your installer should design the system around your home’s generation and consumption rather than simply recommending the largest battery available.
Do You Need a Battery With Solar Panels?
No.
You can install solar panels without battery storage.
A solar PV system can generate electricity for your home during daylight hours, with surplus generation potentially being exported to the grid.
However, whether a battery is worthwhile depends on how much electricity your household generates, how much you use and when you use it.
If you regularly use electricity during the day, you may already be consuming a large proportion of the solar energy your panels generate.
If the house is empty during much of the day, a battery could provide a way to use more of that generated electricity later.
What Are the Main Benefits of Battery Storage?
1. Use More of Your Own Solar Electricity
Without storage, surplus electricity that isn’t being used in the home may be exported.
A battery allows some of that energy to be stored for later use.
This can increase the proportion of your solar generation that is consumed by your household.
2. Use Solar Energy in the Evening
This is one of the most obvious advantages.
Your panels may produce most of their electricity during the day, while your household’s electricity demand increases in the evening.
A battery can bridge that gap.
Instead of generating electricity at lunchtime and using it immediately, some of the energy can potentially be stored and used later.
3. Reduce Reliance on Grid Electricity
The more of your own generated electricity you can use, the less electricity you may need to purchase from the grid.
The actual benefit will depend on your system, household consumption and electricity tariff.
4. Work Alongside Smart Energy Tariffs
Some battery systems can also be used with tariffs that offer different electricity prices at different times.
Depending on the battery, tariff and household circumstances, homeowners may be able to charge the battery from the grid at cheaper times and use that stored electricity later.
This is something that should be discussed with your installer and energy supplier rather than assumed.
5. Help Future-Proof Your Home
Home electricity consumption could increase as more households adopt technologies such as electric vehicles, heat pumps and other electrical appliances.
A suitably designed battery system could form part of a wider home energy strategy.
How Much Does Solar Battery Storage Cost?
There isn’t a single price for battery storage.
The final cost can depend on:
- Battery capacity
- Brand and model
- Installation requirements
- Existing solar system
- Electrical work
- Inverter requirements
- Monitoring equipment
- Warranty
- Installer
Smart Home Improvement People’s existing solar cost guide notes that battery storage can add several thousand pounds to a solar installation, with the cost varying according to capacity and equipment.
This is why homeowners should avoid choosing a battery based purely on its headline price.
A cheaper battery may not necessarily provide the same capacity, warranty, performance or features as another system.
What Size Solar Battery Do You Need?
Bigger isn’t automatically better.
A battery needs to be matched to your household’s energy consumption and the amount of electricity your solar system is likely to generate.
For example, a household that uses relatively little electricity may have little reason to install a very large battery.
Likewise, a larger household with high evening electricity consumption may benefit from greater storage capacity.
Your installer should look at factors such as:
- Annual electricity consumption
- Daily electricity usage
- Solar PV system size
- Typical daytime consumption
- Typical evening consumption
- EV charging
- Heat pump usage
- Future electricity demand
The objective should be to find a system that matches your household rather than simply buying the biggest battery your budget allows.
What If You Already Have Solar Panels?
You don’t necessarily need to install a battery at the same time as your solar panels.
Depending on your existing system, it may be possible to add battery storage later.
However, compatibility needs to be checked.
Your installer may need to consider your existing inverter, wiring, system configuration and the age and specification of your solar installation.
If you’re considering a battery as a future upgrade, it is worth mentioning this when you first obtain solar quotes.
Solar Panels and Battery Storage: A Good Combination?
For many homeowners, the two technologies can complement each other.
Solar panels generate electricity.
Battery storage helps you decide when you use that electricity.
The combination can therefore provide greater flexibility than solar panels alone.
However, that doesn’t mean every household needs both.
For example, a home with high daytime electricity consumption may already use a large amount of its solar generation directly.
Another household may generate substantial solar energy while nobody is home and therefore have greater potential to benefit from storage.
What About Electric Vehicles?
If you own or are planning to buy an electric vehicle, battery storage is another factor worth considering.
An EV can represent a significant additional electricity load.
Some homeowners may want to use solar generation to help charge their vehicle, while others may want a combination of solar, home battery storage and a smart EV charger.
If you’re considering all three technologies, tell your installer at the quotation stage.
The system should be designed around your entire household’s electricity use rather than treating each installation as a separate project.
Could a Battery Work With a Heat Pump?
It can be worth considering the two technologies together.
A heat pump uses electricity to provide heating, while solar panels generate electricity.
A battery can potentially provide additional flexibility around when electricity is used.
However, heating demand can be considerably higher than the electrical demand of a typical household appliance, particularly during colder periods when solar generation may also be lower.
For this reason, homeowners considering solar panels, battery storage and a heat pump should have the complete energy system assessed rather than assuming a particular battery size will cover their heating needs.
Where You Live Can Affect Your Solar Options
Solar works throughout the UK, but choosing an installer familiar with your local area can make the process easier.
Smart Home Improvement People already publishes regional solar guides designed to help homeowners research local installers.
For example, homeowners considering solar in Kent can explore our guide to solar PV companies in the county.
Similarly, homeowners in Berkshire can use our regional guide to solar PV installers, which covers issues including installer experience, costs, battery storage and obtaining multiple quotes.
- Solar companies in Hampshire
- Solar companies in Dorset
- Solar companies in Wiltshire
- Solar companies in Berkshire
- Solar PV companies in Kent
- Solar companies in Surrey
- Solar companies in Sussex
- Solar companies in Essex
- Solar companies in Hertfordshire
- Solar companies in Oxfordshire
- Solar companies in Buckinghamshire
- Solar companies in Gloucestershire
- Solar companies in Somerset
These location pages can then provide more detailed information about installers operating in each area.
How to Decide Whether You Need a Battery
Before adding battery storage to your solar installation, ask yourself these questions.
How much electricity do you use?
Look at your electricity bills and smart meter data.
Understanding your actual consumption is more useful than relying on an average household figure.
When do you use electricity?
This is particularly important.
If your household uses most of its electricity during daylight hours, you may already be making good use of your solar generation.
If most of your consumption happens in the evening, storage could be more useful.
Are you planning an EV?
An electric vehicle can substantially change your household electricity requirements.
Tell your installer if an EV is part of your plans.
Are you considering a heat pump?
A heat pump can also change your electricity consumption, so it should be factored into your overall system design.
How much is the battery going to cost?
Don’t simply compare the battery price.
Look at the complete installed cost, warranty, usable capacity and expected performance.
Have you compared installers?
Getting more than one quotation can help you understand whether the proposed battery size and specification are appropriate for your home.
Don’t Choose a Battery Simply Because You Have Solar
One of the biggest mistakes homeowners can make is assuming:
Solar panels = must have a battery.
That’s not necessarily the case.
A battery is another investment, and its value depends on your individual circumstances.
A good installer should be able to explain why a particular battery size has been recommended and how it fits with your solar system and household consumption.
Be wary of claims that promise guaranteed savings without considering your actual energy use.
Questions to Ask a Solar Battery Installer
Before signing a contract, ask:
What size battery are you recommending and why?
The installer should be able to explain how the capacity relates to your household.
What is the usable battery capacity?
The headline capacity isn’t necessarily the same as the amount of energy you can actually use.
What warranty is included?
Check both the length and terms of the warranty.
Can the battery be expanded later?
Some systems provide more flexibility than others.
Will the battery work with my existing solar system?
This is particularly important if you’re adding storage to an existing installation.
What happens when the battery is full?
Ask how surplus solar electricity will be handled.
Can the system work with an EV charger?
If you have an EV or are considering one, make sure the system can accommodate your future plans.
What monitoring is included?
A good monitoring system can help you understand how much electricity your panels are generating and where it is being used.
Should You Buy Solar Panels and a Battery Together?
There isn’t a universal answer.
Buying both together can provide a complete system from the start, and the installer can design the components to work together.
However, homeowners who already have solar may be able to add storage later, subject to compatibility.
The important thing is to compare the whole system, rather than making the battery decision in isolation.
Final Thoughts: Do You Need Battery Storage?
A solar battery isn’t essential for every solar installation.
But for some homeowners, it can be a valuable addition.
The key question isn’t simply:
“Do I need a battery?”
It is:
“Will a battery make sense for the way my household generates and uses electricity?”
If your home produces a significant amount of surplus solar electricity during the day and uses more electricity later, battery storage could be worth investigating.
If your household already uses most of its solar electricity as it is generated, the case may be different.
The best way to find out is to compare a properly designed solar-only system with a solar-and-battery system.
Looking for Solar Installers in Your Area?
Smart Home Improvement People helps homeowners compare quotes from professional home improvement companies across the UK.
If you’re considering solar panels, battery storage or another home energy upgrade, start by researching installers in your area and comparing what they recommend for your property.
Explore our local solar guides, including regional information for areas such as Kent and Berkshire, before requesting quotes.
Your home, energy consumption and budget are unique — so your solar system should be designed around them.
