Your complete guide to home batteries for energy storage.
Learn more about how home batteries store your excess solar energy, reduce your reliance on the grid and help you use more renewable power throughout the day.
Home battery storage, key takeaways.
What it does.
Home batteries store excess solar energy or cheap overnight electricity from the grid to power your home during expensive peak hours.
Cost and sizing.
Complete systems start from £3,995 installed (with 0% VAT). Ideal capacity depends on daily consumption kWh usage (typically 5kWh–10kWh for UK homes) and solar array size.
Smart tariffs and SEG.
Pairing a battery with smart time-of-use tariffs lets you automate cheap off-peak charging and export of surplus energy back to the grid for passive income via the Smart Export Guarantee (SEG).
Technology.
Modern Lithium Iron Phosphate (LFP) batteries offer high efficiency, 6,000+ charge cycles, and 10-year manufacturer warranties.
What is home battery storage?
Home battery storage allows you to capture solar energy, store it safely inside your home battery and use it later when you need it most. Rather than immediately using all the electricity you generate, a battery acts as a smart buffer between your household appliances, your solar panels, and the National Grid.
At its core, a battery system stores your surplus solar generation. So,If your solar panels produce more electricity during the day than your home needs, a battery stores that green energy for the evening instead of exporting it back to the grid for low rates.
Explore home battery topics at a glance.
Guide name | Topics | Target household |
|---|---|---|
Right-sizing battery capacity (kWh) to reduce grid reliance, without overpaying upfront. | Homeowners trying to match their solar panel output to their daily electricity use. | |
Explains LFP vs NMC, Depth of Discharge (DoD), efficiency, and AC vs DC coupling. | Homeowners comparing technical specs and 10-year manufacturer warranties. | |
Maximising off-peak grid charging when solar output drops during shorter winter days. | Households on smart time-of-use tariffs seeking year-round bill reductions. | |
Next Optimise dynamic tariff and SEG. | Generate passive income by selling surplus stored power back to the National Grid. | Solar and battery owners looking to monetise their excess generated electricity. |
Benefits of a home battery.
Slashing energy bills.
Home batteries store excess daytime solar energy or cheap off-peak grid electricity, slashing your overall energy costs.
Smart tariff integration.
Pairing a battery with smart time-of-use tariffs lets you automate charging overnight when energy prices drop to their lowest.
Passive income with SEG.
Qualifying home storage systems can export surplus energy back to the grid for passive income via the Smart Export Guarantee (SEG).
Long-life LFP technology.
Modern lithium iron phosphate (LFP) batteries offer high efficiency, long lifespans, and 10-year manufacturer warranties.
About home solar batteries and energy storage.
Home battery storage gives you greater control over how and when you use energy in your home. A battery can store excess electricity generated by your solar panels, or energy bought from the grid during cheaper periods, so it can be used later when demand or prices are higher.
Explore how home batteries work, their benefits, installation costs, and whether energy storage could be right for your home. Find out more about E.ON Next solar and battery solutions
Get a home battery quoteHow to determine what size battery you might need.
Selecting the right battery storage capacity (measured in kilowatt-hours, or kWh) is essential for getting the maximum return on your investment. Choosing a unit that’s too small means you’ll spill valuable solar generation, and/or still rely on expensive peak grid energy, while an oversized system increases upfront costs without providing strong financial benefit.
Your ideal capacity depends on your daily household electricity use, the size of your solar panel system, and whether you plan to charge the battery overnight on an off-peak tariff.
What should you look for when buying a home battery.
With a wide variety of domestic energy storage products on the market, understanding the underlying technical specifications ensures you buy a system suited to your long-term needs. Key factors to evaluate include battery chemistry (such as Lithium Iron Phosphate vs. Nickel Manganese Cobalt), usable capacity vs. total capacity, depth of discharge (DoD), round-trip efficiency, and warranty cycle limits.
Additionally, you should consider whether an AC-coupled or DC-coupled setup aligns best with your existing solar inverter.
Home battery storage in winter: how to keep your bills low and your home smart.
During shorter winter days, solar panel output naturally drops, but home batteries remain just as effective at reducing your energy bills. By pairing your battery with smart time of use tariffs, you can schedule your storage system to charge from the grid during cheap overnight hours when wholesale rates plummet.
You then use that low-cost stored energy to power your heat pump, appliances, and home heating during expensive morning and evening peak periods.
Discover practical winter energy strategies in our guide on solar batteries in winter.
Our home batteries start from £3,995.
Upgrading your home with smart battery storage is more accessible than ever. Whether you want to retrofit storage onto an existing solar array or install a stand-alone grid-charging battery, our modular storage packages start from £3,995 installed.
Every installation features high-performance, safe Lithium Iron Phosphate (LFP) technology, full installation by MCS certified engineers, and a 10-year product warranty for complete peace of mind.
Tailored capacity sizing.
10-Year warranty.
MCS certified engineers.
Next Optimise: Automated battery management and dynamic tariffs.
Next Optimise is E.ON Next’s dynamic import and export tariff designed specifically for home battery owners. Powered by SmartShift™ AI technology, the system connects your battery to half-hourly wholesale energy market prices. It automatically charges your battery when electricity is cheapest (or negative) and exports stored surplus power back to the grid when market rates peak, maximising your savings without manual management.
How Next Optimise automates your savings.
Dynamic wholesale tracking: Monitors half-hourly price fluctuations 24/7 to predict the most cost-effective times to buy and sell power.
AI-Driven SmartShift™ Optimisation: Calculates a personalised 24-hour battery plan based on real-time wholesale rates, your daily household energy habits, and incoming weather forecasts.
Automated response to import and export spikes: Low-cost charging: Tops up your battery during off-peak windows or periods of high renewable generation on the grid.
Peak price exporting: Automatically exports unused power back to the grid during high-demand evening hours (e.g., 4 PM–7 PM) to maximise export payouts.
Efficiency safeguard: The AI factors in battery round-trip efficiency, ensuring it only trades energy when there is a clear net financial gain.
Full control and backup protection: Switch between automated and manual modes anytime in the Next Optimise app, with built-in backup reserve limits to ensure your home never drains during an emergency.
Key compatible battery systems.
Works seamlessly with major UK battery inverters, including:
Tesla.
Powerwall 2 and Powerwall 3.
GivEnergy.
All inverters and storage systems.
Fox ESS.
H1-G2, KH, and H3 Smart Range.
AlphaESS & Sigenergy.
Sell stored solar energy from your home battery to the grid.
Home battery storage allows you to become an active player in the energy market by exporting surplus electricity back to the National Grid. Through government-backed Smart Export Guarantee (SEG) schemes, energy suppliers pay you for every kilowatt-hour of green power you export.
To participate, your home must have an eligible renewable generation system (such as solar PV), a compatible smart/export meter, a certified battery inverter, and an active SEG agreement. It's important to note that export tariffs vary: while solar-generated energy stored in your battery qualifies for export payments, power drawn directly from the grid and stored solely for resale may be restricted or subject to specific smart tariff conditions depending on your supplier.
Read full eligibility terms on our Smart Export Guarantee guide.
See our comprehensive blogs on home batteries.
Explore our in-depth articles on smart energy automation, wholesale market trading, battery maintenance, and future grid technologies.
The home energy stack of 2030: how Next Optimise is building your fully automated energy system.
Next Optimise: automated battery management explained.
Why the grid needs your home battery's flexibility.
Next Optimise: top solar and battery questions answered.
Take control with smart solar and battery tracking.
Future-proof your home against energy price volatility.
Wholesale energy prices and home battery trading.
Save smarter on solar and battery with Next Optimise.
Next Solar MAX pilot: key findings and lessons learned.
How home battery storage keeps your lights on.
Next-gen home energy as a service.
What is the average solar panel output per day in the UK?
Recharge solar batteries with UK smart tariffs.
Get a home battery quote today.
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