Best Home Battery Systems 2026

A home battery does three things, and it is worth being clear which one you actually want. It stores your own solar generation for use after dark, which raises self-consumption. It buys electricity when it is cheap and uses it when it is expensive, which pays regardless of whether you have panels. And on some systems it keeps the lights on during a power cut — but only on some, and that capability is often assumed rather than confirmed.

The decision that constrains everything else is the inverter. An inverter converts the direct current (DC) that panels and batteries produce into the alternating current (AC) your house uses. Several manufacturers — Fronius, Growatt and SMA among them — only sell batteries that work with their own inverters, so if you already have solar, your existing inverter may rule out most of the market before you start comparing capacities.

The way around that is an AC-coupled battery, which contains its own inverter and connects on the household AC side. It works with essentially any existing solar setup, at the cost of one extra conversion step and slightly lower round-trip efficiency. Sonnen and EcoFlow’s DC Fit retrofit are the notable inverter-agnostic options here.

What to look for

Your existing inverter, first

If you already have solar, find out which inverter you have before anything else. Fronius, Growatt and SMA batteries only pair with their own brand. An AC-coupled battery avoids the issue entirely and works with almost anything.

Capacity in kWh, and whether it scales

Capacity is measured in kilowatt-hours. A typical household evening uses 5–10 kWh, so that is a sensible starting point. More useful than the initial figure is whether you can add modules later, because your consumption will change.

Power output in kW, not just capacity

Capacity is how much is stored; output is how fast it can be delivered. A large battery with modest output cannot run an induction hob, a kettle and a heat pump simultaneously. Check the continuous kW figure against your realistic peak.

Cycle life under warranty

Battery wear is counted in charge cycles — one full charge and discharge. Warranties here run from 6,000 to 10,000 cycles. At roughly one cycle a day, 6,000 cycles is about sixteen years, so this is less limiting than it sounds, but it is the honest basis for comparing longevity.

Backup power, or not

Running your house from the battery while disconnected from the grid is called island mode or off-grid capability, and it needs specific hardware. Several batteries explicitly cannot do it and require a permanent grid connection — so if outage protection is why you are buying, verify it in writing.

Where it will live

IP20 means indoor only. IP65 allows outdoor installation. Batteries are heavy, and a garage or utility wall usually needs checking for load-bearing capacity as well as ventilation and temperature range.

The shortlist compared

Brand	Model	Capacity	Inverter	Cycles	IP rating	Approx. per kWh
SolarEdge	Home Battery	10–30 kWh	SolarEdge only	10,000	IP65	€600
SMA	Energy Home Storage	3.2–16.4 kWh	SMA hybrid only	8,000	IP65	€625
Sessy	Home Battery	5–30 kWh	Any, or standalone	6,000	IP20	€650
Growatt	ARK Battery	7.5–25 kWh	Growatt only	6,000	IP65	€500
Homevolt	Battery	6.6 or 13.3 kWh	Built in	6,000	IP65	€750
Sonnen	Batterie 10	5.5–22 kWh	AC-coupled, any	10,000	IP56	€800
Fronius	Solar Battery	4.5–12 kWh	Fronius only	8,000	IP20	€1,100
EcoFlow	PowerOcean	5–45 kWh	Built in, or DC Fit retrofit	6,000	IP65	€1,200

Prices move constantly and vary by country, so we give an indicative band rather than a figure that would be stale within a month. Check the brand's own store for the current price.

The picks in detail

Sessy Home Battery

Any inverter, or standalone

The most flexible option here, and the standout if you do not have solar panels. Because it can operate standalone on a dynamic tariff — charging at 3am when prices are low, discharging during the evening peak — it pays for itself on price differences alone. That is increasingly the main reason Dutch households buy a battery at all.

The practical caveat is installation: units do not stack, and each needs its own wiring run, so a 20 kWh system is four separate installations rather than one. Budget accordingly and expect a professional installer.

Works with single- and three-phase inverters
Runs standalone with no solar at all, purely on tariff arbitrage
5 kWh modules scale to 30 kWh
Good software control including power limits and fault alerts

Units are not stackable and each needs its own wiring
IP20, so indoor only

Sonnen Batterie 10

AC-coupled, any inverter

The retrofit answer. Being AC-coupled means it brings its own inverter and connects on the household AC side, so your existing panels and inverter — whatever brand — do not need replacing. For anyone who installed solar five years ago and now wants storage, that removes the single biggest obstacle.

It also genuinely does backup, which several rivals do not, and the 10,000-cycle warranty is at the top of the field. You pay handsomely for all of this, but it is the least compromised system on the list.

AC-coupled, so it works with essentially any existing solar system
10,000+ cycles under warranty
Genuine backup capability
Time-of-Use scheduling supported

Most expensive system here

SolarEdge Home Battery

SolarEdge inverters

If you already have SolarEdge solar, this is close to a default choice: excellent cycle life, generous scaling, outdoor rated, and good software control. Two variants exist — a 400 V single-phase battery for Home Hub and HD-Wave inverters, and a 48 V DC three-phase battery for the Home Short String inverter — so check which matches your installation before ordering.

10,000 cycles — joint best here
Modular from 10 to 30 kWh
IP65 for outdoor installation
Power limits and control modes exposed to automation

Requires SolarEdge inverters

Growatt ARK Battery

Growatt inverters

The budget option, and by a clear margin on price per kilowatt-hour. Modular 2.5 kWh packs make the sizing granular once you are past the three-pack minimum. The constraint is the ecosystem — Growatt inverters only — so this is a choice you make when specifying a whole new solar system rather than a retrofit.

Cheapest per kWh on this list
Modular in 2.5 kWh packs
IP65 so it can go outdoors

Growatt inverters only
Minimum three packs, so 7.5 kWh entry point

SMA Energy Home Storage

SMA hybrid inverters

German engineering with a long track record, and the small 3.2 kWh entry point is unusually sensible — it lets you start modestly and add capacity once you understand your own consumption pattern, rather than guessing at 10 kWh on day one. Requires an SMA Sunny Boy Smart Energy or Sunny Tripower Smart Energy hybrid inverter, meaning one unit handles both panels and battery.

8,000 cycles
Robust IP65 build
Scales from 3.2 to 16.4 kWh
Clear reporting of charge, discharge and grid feed-in

Only pairs with SMA hybrid inverters

EcoFlow PowerOcean

Built-in hybrid inverter, or DC Fit retrofit

Two products worth separating. The standard PowerOcean includes a hybrid inverter — a single unit managing both solar input and battery charge and discharge — making it a complete new installation. The DC Fit version is the interesting one: it adds storage to an existing solar array without replacing the inverter you already own, which is a genuinely useful middle path between AC-coupling and a full rebuild.

Built-in hybrid inverter, so it connects directly to solar and grid
DC Fit version retrofits to existing solar without changing the inverter
Scales to 45 kWh — the largest here
IP65

Highest price per kWh

Homevolt

Built-in Polarium inverter

A tidy all-in-one with genuinely clever software: it trades your stored energy against hourly wholesale prices, buying low and discharging high without you managing anything. For a household on a dynamic tariff, that automation is the whole value proposition.

One limitation to be very clear about, because it is the opposite of what most people assume a battery does: there is no island mode. It requires a permanent grid connection and will not power your house during an outage. If backup is your reason for buying, this is not the product.

All-in-one unit with the inverter built in
Software trades against hourly market prices automatically
Three colour finishes
IP65

No island mode — it cannot provide backup during an outage
Price optimisation works best with a specific tariff provider

Fronius Solar Battery

Fronius inverters

Well built, with LiFePO₄ (lithium iron phosphate) cells — the chemistry that trades a little energy density for markedly better safety and cycle life, which is the right trade in a building. The constraints are real though: it works only with Fronius Primo, Symo and GEN24 Plus inverters, and IP20 means it cannot be installed outdoors at all, so you need suitable indoor space.

LiFePO₄ chemistry, which is safe and long-lived
8,000 cycles
Solid build quality
Detailed monitoring of power, current, voltage, level and temperature

IP20 — indoor only
Fronius Primo, Symo or GEN24 Plus inverters only
Highest price per kWh of the inverter-locked systems

Does a home battery actually pay?

Sometimes, and the answer depends far more on your tariff and country than on the hardware.

Where it usually does. If you are on a dynamic hourly tariff, the daily spread between the cheapest and most expensive hours is often large enough that charging at night and discharging at the evening peak pays a real return — with no solar panels required. If your country has ended or is phasing out net metering (the arrangement where exported solar is credited at the same rate you pay for imports, as the Netherlands is changing), storing your own generation suddenly becomes far more valuable than exporting it.

Where it usually does not. On a flat tariff with generous net metering still in place, there is little to arbitrage and little reason to store. In that situation a battery is buying resilience and independence rather than savings, which is a legitimate purchase — just not a financial one.

Two figures to ask any installer for: the round-trip efficiency, which is the percentage of energy you get back out after storing it (typically 85–95%, and the losses are real money), and the usable capacity as opposed to the nominal figure, since most systems deliberately hold a reserve.

This is fixed electrical plant, not a gadget. Installation involves your consumer unit, usually requires notification to your grid operator, and in many jurisdictions requires specific permits and a certified installer. Get at least two quotes, insist on written confirmation of whether backup during an outage is included, and check the warranty covers cycles and years. We are not financial advisers — the payback arithmetic depends on your tariff, your consumption and future prices, so treat any projection as a scenario rather than a promise.

Frequently asked questions

Will a home battery work with my existing solar panels?

It depends on the battery. Fronius, Growatt, SMA and SolarEdge batteries only work with their own brand of inverter, so an existing installation may rule them out. AC-coupled batteries such as the Sonnen Batterie 10 include their own inverter and connect on the household AC side, so they work with essentially any existing system. EcoFlow’s PowerOcean DC Fit is a middle path that retrofits without replacing your inverter.

How big a battery do I need?

Start from your evening consumption, which is what a battery covers. Most households use 5–10 kWh between sunset and bedtime, so that is a sensible first target. Measure before you buy — an energy meter costing €30 will tell you your real pattern, and oversizing a battery is an expensive way to guess.

Will a battery keep my house running in a power cut?

Only if it supports island mode, and several do not. Homevolt explicitly cannot — it requires a permanent grid connection. Sonnen and SolarEdge are backup-capable. If outage protection is your reason for buying, get it confirmed in writing, because it also requires specific installation work beyond the battery itself.

What is a charge cycle and how long will a battery last?

One cycle is a full charge and discharge. Warranties here run from 6,000 to 10,000 cycles; at roughly one cycle a day, 6,000 cycles is about sixteen years. In practice batteries lose capacity gradually rather than failing outright, so warranties usually guarantee a percentage of original capacity remaining at the end of the term.

What is the difference between AC-coupled and DC-coupled?

A DC-coupled battery connects on the direct-current side, sharing an inverter with the solar panels — more efficient, but it ties you to compatible inverters. An AC-coupled battery has its own inverter and connects on the household alternating-current side — slightly less efficient because of the extra conversion, but compatible with almost any existing solar installation.

Terms explained

kWh and kW: Kilowatt-hours measure how much energy is stored; kilowatts measure how fast it can be delivered. A 10 kWh battery with 3 kW output holds a lot but cannot run an induction hob and a heat pump at once.
Hybrid inverter: A single unit that manages both solar panel input and battery charging and discharging, instead of using separate devices for each.
AC-coupled: A battery with its own built-in inverter that connects to the household alternating-current supply, making it compatible with virtually any existing solar system at the cost of one extra conversion step.
LiFePO₄ (lithium iron phosphate): A battery chemistry that stores slightly less energy per kilogram than alternatives but is markedly safer and lasts more charge cycles — the right trade-off for something installed in a building.
Island mode: The ability to disconnect from the grid and run the house from the battery alone, which is what provides backup during a power cut. It requires specific hardware and is not a given.

More terms in the smart home glossary. Related questions: Does my solar inverter matter for smart home automation?

Energy Storage Systems