If you’ve installed solar panels or are planning to, you’re likely asking: “How much energy can a solar battery store?“. 

Solar batteries typically store between 5 kWh and 50+ kWh of energy, but the ideal capacity for your home depends on your specific energy usage, size, and goals (such as EV charging, or minimising grid reliance or futureproofing against further energy price rises).

Naked Solar don’t believe in one-size-fits-all solutions. We take the time to understand your unique needs, using advanced modelling tools to analyse your energy use. This allows us to help you choose a solar battery that is perfectly suited for your home or business, ensuring it serves you well for decades to come.

Key considerations for your Solar Battery Storage Capacity:

• Do you want to minimise your electricity bills? 
• Do you want to maximise your return through Solar Grid Trading? 
• Do you want a reliable, function rich battery storage system?  Or are you focused on a low budget solution? 
• Do you want to dip your toe with a smaller system and expand it later?

Naked Solar’s impartial approach means we never pigeonhole our customers. We offer a wide variety of solar and Battery Storage Systems, ensuring you make an informed choice that aligns with your specific needs and desires. Our experts are here to help you navigate your options and find the perfect solution for your home.

 

Typical Battery Storage Capabilities 

Modern Solar Batteries usually range from 5 kWh to 50 kWh of storage (1kWh = 1 unit of electric).  Here’s what that means in practice:

Battery Capacity	Usage Snapshot
5–10 kWh	Enough for smaller households to cover evening usage after the sun goes down.
10-2o kW	Powers medium to larger homes with higher energy needs particularly with EV charging, hot tubs or heat pumps for up to 1 day
20 kWh +	For high-demand homes, businesses, or those looking for near-total independence from the grid.

• 5–10 kWh: enough for smaller households to cover evening usage after the sun goes down.
  
• 10–20 kWh: powers medium to larger homes with higher energy needs particularly with EV charging, hot tubs or heat pumps for up to 1 day. 
• 20 kWh+: for high-demand homes, businesses, or those looking for near-total independence from the grid. 

To put that into perspective:

• A 10 kWh battery could power a fridge, lights ,Wi-Fi a couple of hours of tele & some cooking for around 24 hours. 
• A 20 kWh battery could charge an electric car for roughly 60 miles of range. 

Learn more on our ‘6 Watts? of Solar Storage’ page, including our Storage Comparison table.

 

Scalable Systems: Grow As You Need

Advancements in Battery storage technology allows homeowners to add to their storage capacity after Installation.  This not only allows the system to be futureproofed as energy demands change but scale accordingly as the system pays back. 

• Tesla Powerwall 3 Expansion Pack: An 13.5 kWh unit of storage to your Tesla Powerwall system without needing another inverter. You can add up to three DC expansion pack units per Powerwall 3 Unit, meaning a total of 54 kWh
  
• Sigenergy Sigenstor: A flexible system that allows you to add 6kWh or 9kWh  modules over time, scaling up your battery bank as your energy use grows. The system is scalable to 54kWh per stack.
• Fox ESS: For the budget conscious, the Fox ESS provides a reliable Battery Storage option. Battery modules can be added to reach up to 41.6kWh for larger home systems. 

This scalability makes solar batteries a future-proof investment – perfect for when you add an EV, a home office, or new appliances.

 

Why Bespoke Design Matters 

Every home uses energy differently. That’s why we use PV Sol software to design systems with precision. This powerful tool lets us:

• Model your roof, shading, and orientation in 3D 
• Simulate your household’s energy consumption patterns 
• Compare how different batteries will perform for you 

The result? You’ll know exactly how much energy your solar battery can store and how much of that stored energy you’ll actually use. Discover the power of PV Sol and exactly how we use it with our try before you buy tool.

 

Our in-house design team will produce a bespoke Solar report for your home, helping you make an informed decision.

 

How Long Will My Battery Last? 

A good solar battery should last at least 10 years, and often longer.  Many come with warranties guaranteeing thousands of charge cycles, which equates to well over a decade of daily use.

That’s why our team focuses on matching you with the right-sized battery for your lifestyle, not just today but for the future too. When researching this topic, it can be easy to feel pushed to chase short-term market or price trends. We always advise against that – a carefully chosen system will outlast price fluctuations and special offer tariffs to give you reliable value for the long term.

 

The Naked Solar Difference 

Naked Solar install any products  – Tesla, Sigenergy, or any another manufacturer so we can remain impartial and advise on what’s best for your property and desires.  To give homeowners a clearer overview of two powerhouses in the Battery Storage market, we put together a  Tesla Powerwall 3 vs Sigenergy Sigenstor article.

As an independent installer, Naked Solar don’t take commission, so you can be confident our advice is impartial.  With us, you’ll get a tailored system, not an off-the-shelf bundle.

 

Our award-winning team have helped thousands of homeowners in Cornwall, Devon, Exeter, Bristol and throughout the South West. We’d be delighed to help you, too.

 

 

FAQs About Solar Battery Storage

Is a 10 kWh solar battery enough for a house?
For smaller or average households, 10 kWh will usually cover evening and night-time use. Larger homes or those with EVs may need 15–20 kWh or more.

How many solar batteries do I need to go off-grid?
That depends on your daily consumption.  Most homes would need 20–40 kWh of storage to achieve near-complete grid independence throughout the winter.

What happens when a solar battery is full?
Excess electricity can be exported back to the grid (learn how you can turn your Solar Battery Storage into a renewable revenue stream with Solar Grid Trading or diverted to other systems like water heating.

Can you add more batteries later?
Yes. With modular systems like Tesla Powerwall 3 Expansion Packs or Sigenergy Sigenstor, you can expand your storage capacity over time.

 

Talk to Naked Solar 

So, how much energy can a solar battery store?  Anywhere from 5 kWh to 50+ kWh – but the right answer depends on you and your space.  With modular systems, smart software, and a trusted installer like Naked Solar, your system can grow with you while delivering peace of mind for the next decade and beyond.

Ready to see how much storage your home could benefit from?  Explore battery storage with Naked Solar or talk to our team today.

 

Find Your Perfect Storage Solution