Hoymiles Storage Systems for the Home

Hoymiles sells home batteries across a wide span of sizes: a low-voltage stackable range running from a 5.12 kWh single pack up to 102.4 kWh in a fully expanded second-generation system, a plug-in HiBattery 4020 line starting at 4.02 kWh per module, and hybrid inverters that pair the storage with solar¹. The batteries use LFP (lithium iron phosphate) chemistry, the same family most UK home storage now uses, and Hoymiles quotes a warranty period of up to 10 years on its low-voltage battery¹.

For context, the Energy Saving Trust describes a typical home battery system as around 10 kWh³, so Hoymiles' range covers everything from a small plug-in unit for self-consumption to stacks large enough for a property with a heat pump and an electric car. The company also makes the inverters, smart meters and, since September 2026, a V2X EV charger that can feed a car's battery back into the house⁴, which means a Hoymiles system can be built entirely from one maker's parts, with the lock-in that brings.

Low-voltage storage capacities from 5.12 to 102.4 kWh at a glance

The core of the Hoymiles storage offer is its low-voltage battery, built from 5.12 kWh packs. The first-generation system supports up to four battery packs in parallel, allowing a total capacity of 20.48 kWh; the second-generation system also supports four packs in parallel but adds up to five battery racks in parallel, expanding the total capacity to 102.4 kWh¹. A single rack delivers up to 10 kW of output, and Hoymiles gives a maximum output figure of 10.24 kW per 20 kWh stack¹. The packs are thin, at 145 mm in depth, which matters where a battery has to share a wall or cupboard¹.

That top figure of 102.4 kWh is far beyond a typical home. The Energy Saving Trust puts a typical home system at around 10 kWh³, so most households will be looking at one rack, or one rack plus a second later. Hoymiles also publishes a high-voltage battery, the HB-G2, which starts from 11.52 kWh with three modules and expands to 23.04 kWh with six modules in a single rack², sitting between the plug-in units and the big low-voltage stacks. How usable capacity relates to the headline figure is covered in battery capacity and usable capacity, and the thinking behind sizing a system is in what size home battery you need.

Plug-in battery families: LB-G2, HIT-G3 and HiBattery 4020

The LB-G2 series, launched in October 2024, is the stackable low-voltage battery: deep-cycle, high-capacity LFP batteries that support up to four modules per rack (20.48 kWh) and five racks in parallel, reaching 102.4 kWh². Hoymiles states these batteries work with its HMS-series microinverters and its HYS-LV-EUG1, HYS-LV-EUG2 and HAS-LV-EUG1 energy storage inverters, with the VAS-7-G2 EV charger in the same system². The HYS-(3-6)LV-EUG1 storage inverter, for example, works across a 40 to 60 V battery voltage range and is monitored through S-miles Cloud⁷.

On the inverter side, the HIT series are hybrid inverters paired with the LB series battery⁸. The battery side of the ecosystem therefore depends on Hoymiles' own inverter hardware: the LB and HiBattery modules are designed to work within that pairing rather than as standalone packs for any third-party inverter.

The HiBattery 4020 series, launched across Europe in June 2026, is the third generation of Hoymiles' plug-in home battery system, sold as the hybrid 4020 X and the AC-coupled 4020 AC⁹. Its headline features:

• A 4 kWh battery capacity per module, expandable up to 16 kWh with extra modular battery stacks⁹
• Automotive-grade LiFePO4 cells⁹
• A rated module capacity of 4.02 kWh, reaching 16.08 kWh total when paired with a Hoymiles smart meter⁵
• A 314Ah large-format cell design on the 4020 X, with a life-time support service¹⁰
• Pack-level DC/DC balancing, so new and existing battery modules can be mixed as the system grows⁹

Hoymiles describes the HiBattery as its latest AC-coupled plug-in product¹². The differences between those couplings are explained in AC-coupled and DC-coupled systems, and the plug-in category in plug-in battery storage.

Cycle life: 6,000 to 8,000+ cycles and what that means in years

Hoymiles quotes 6,000 or more charge-discharge cycles for its low-voltage battery¹ and 8,000 or more life cycles for its residential energy storage battery¹⁰. The HiBattery 4020 module and the 4020 X are both rated at 8,000 cycles at 70% state of health, meaning the battery is counted as reaching the end of its rated life when it can still hold 70% of its original capacity⁵. A cycle, in the definition used across the industry, "indicates how many times a battery can be fully charged and discharged during its expected lifespan"¹³.

Those figures sit at the favourable end of what LFP home batteries offer. Industry guidance on lithium iron phosphate batteries puts modern home storage systems at 4,000 to 8,000 or more cycles¹⁴, and one maker's guide translates 6,000+ cycles into a battery lasting 10 to 15 years¹⁵. For comparison, the older lead-acid AGM type manages between 600 and 1,500 cycles¹⁶, which is why LFP has taken the home market; the chemistry comparison is in home battery chemistries.

What the headline number means in years depends on how often the battery is cycled. A system that charges from solar each day and discharges each evening completes roughly one cycle a day, while a battery used mainly for rare power cuts may complete far fewer. Hoymiles states the low-voltage battery takes about two hours to fully charge at a 0.5 C rate¹, so a daily solar charge is well within its working pattern. Degradation, retained-capacity warranties and what actually ends a battery's life are covered in cycle life and degradation and home battery warranties.

Keeping batteries working in cold UK garages and outbuildings

Cold is the main environmental limit on a home battery, and Hoymiles has engineered for it directly. When temperatures drop below 0 degrees C, the low-voltage battery automatically activates its heating function¹. On the LB-G2, the self-heating module activates at 0 degrees C and heats the battery to 10 degrees C within half an hour².

The limits are worth reading closely. The low-voltage battery discharges across -20 to 50 degrees C, but charging only works between 0 and 50 degrees C¹, so a battery in an unheated outbuilding in a hard frost can supply power but cannot safely take a charge until its heater has lifted its temperature.

The Battery Management System adds protection against over-temperature, over-voltage and over-current, and will automatically issue an alarm or stop operation on a fault¹.

For a UK garage or outbuilding installation, that makes the practical question one of siting and power for the heater rather than chemistry. Where a battery can go, and the conditions it needs, is covered in battery siting and location and ventilation and temperature.

How the 8×24h schedule works on the HIT-(5-20)L-G3

The HIT-(5-20)L-G3 is a high-performance three-phase hybrid inverter, and its headline feature for tariff-aware households is an 8×24h time-of-use schedule¹⁷. In practice that means the system can be programmed with different charge and discharge behaviour across eight periods of the day, which is what a household needs to charge cheaply overnight on an off-peak tariff and discharge during expensive evening hours. How that stacks with UK smart tariffs is covered in batteries and smart tariffs.

The inverter's other figures matter for what a system can carry:

• 100% unbalanced output, meaning the three phases can be loaded unevenly¹⁷
• DC/AC oversizing of up to 200%¹⁷
• A built-in meter solution with up to 50 A bypass¹⁷

Hoymiles confirms the low-voltage battery can be charged using grid power¹, which is the function that makes time-of-use scheduling work at all: without grid charging, a battery is limited to whatever solar produces. The Energy Saving Trust makes the same point from the other direction, noting that combining solar panels with a home battery lets a household store renewable electricity to power a heat pump, making it less reliant on grid electricity¹⁹.

Remote upgrades and monitoring via S-miles Cloud

Monitoring and control run through S-miles Cloud, Hoymiles' platform. The low-voltage battery supports remote monitoring of charge-discharge data and can be remotely upgraded for system management via S-miles Cloud¹. The platform enables real-time data monitoring and remote fault diagnosis⁸, and Hoymiles describes it as letting a user "manage and control your system remotely in real time, adjust settings, upgrade firmware and boost operational efficiency"²⁰. At module level it tracks voltage, current, power and temperature for each panel in real time²⁰.

The link between hardware and cloud is a data logger: the DTU-Lite-S provides module-level monitoring and data storage and sends data to S-Miles Cloud, while the DTU-Pro-S adds remote upgrading and parameter setting²¹. The HiBattery 4020 X and 4020 AC can be monitored through the Hoymiles S-Miles app⁵, and the LB-G2's app automatically detects Hoymiles inverters and batteries without extra configuration, showing pack-level charging, discharging and fault statuses². A three-phase smart meter adds real-time energy data in the S-Miles Home app when connected to a compatible Hoymiles system, and carries a 2-year warranty²³.

This is a real dependence to weigh. Remote upgrades, fault diagnosis and monitoring all run through the manufacturer's platform, so an installed Hoymiles system keeps a working link to the company's cloud for as long as it is supported. What that means in practice, and what happens to local control, is covered in monitoring a home battery.

How Hoymiles batteries support greater energy independence at home

A Hoymiles battery does the core job of home storage: it shifts electricity from when it is generated or cheap to when the household needs it. The HiBattery system can be used on-grid and off-grid, and the HiBattery alone can serve as a power bank to sustain appliances¹². The LB-G2 is positioned as stable solar power backup for residential use², and since September 2026 the ecosystem extends to a V2X DC charger that can provide backup power when the grid is unavailable through Vehicle-to-Home, delivering approximately 110 km of driving range worth of charge in one hour, with green power and fast charging modes⁴.

The independences that remain are worth stating plainly:

• The battery can be charged from the grid¹, so a household without solar still depends on a supplier and its tariffs, and one with solar still depends on the grid for the hours storage cannot cover.
• The battery is compatible with the Hoymiles protocol¹, which ties expansion to Hoymiles' own inverters and batteries rather than open mixing with other brands.
• Monitoring and upgrades depend on S-miles Cloud and the S-Miles app¹.
• Regular maintenance is required, with the user manual as the reference¹.
• The warranty runs to 10 years, with paid extensions offered at 10, 12, 15, 20 and 25 years, registered with country, proof of purchase and accepted terms⁶.

The wider picture of what storage does and does not free a household from is in home batteries and household energy independence.