Home Battery Storage Manufacturers

Home batteries have moved from a niche add-on for solar households to a mainstream purchase, and the number of companies selling them in the UK has grown with the market. MCS, the certification body, now publishes official statistics on retrofitting electric batteries into domestic properties across the United Kingdom¹, and just under 3,000 registered installations were recorded in January 2025 alone². The Energy Storage Association describes the UK as having a strong domestic battery market, with no evidence that battery companies plan to stop operating here³. This page profiles the makers behind those products, with a detailed look at Fogstar Energy, the British company whose rack batteries have pushed battery-only prices down to levels few established brands match: its 5.12kWh rack battery is listed at £899.99⁴, against a typical 5kWh system cost of around £4,600⁵.

The batteries themselves are almost all lithium-ion, the same chemistry family found in laptops, mobile phones, e-scooters and mobility vehicles in the average UK home⁶. What differs between brands is the packaging: all-in-one units that combine battery and inverter in one wall-mounted box, stackable modules that click together, and rack batteries of the kind Fogstar sells, which slot into a cabinet and wire to a separate inverter. The sections below set out who makes what, what the specifications mean, and what a rack battery does and does not do for a household's energy independence.

UK home battery manufacturers

The UK home battery market is served by a mix of global electronics giants, dedicated storage specialists and domestic sellers. The Energy Storage Association's assessment is that the UK has a strong domestic battery market and that there is no evidence other battery companies plan to stop operating in the country³. That matters for buyers, because a battery is a ten-to-fifteen-year purchase and the warranty is only as good as the company standing behind it, a risk explored on our page on manufacturer failures and orphaned products.

The scale of the market is now tracked officially. MCS publishes statistics on retrofitting electric batteries into domestic properties in the United Kingdom¹, and independent analysis of registered installations counted just under 3,000 in January 2025². Growth has been driven by solar: batteries exist mainly to store excess electricity produced by a solar system, as Solar Energy UK puts it⁹, and the economics of pairing the two have improved sharply. Plug-in solar batteries, which need no installer, are also being developed for the UK market¹⁰, widening the range of who can buy storage at all.

Fogstar Energy sits in this market as a UK-based seller of rack-format lithium batteries at prices well below the established brands. Its products are covered in detail below. Households comparing it against the bigger names will find profiles of GivEnergy, Tesla, Sungrow, Powervault and Pylontech elsewhere on this site, and a guide to reading manufacturer warranties across all of them. The chemistry is common ground: lithium-ion batteries are already widespread in UK homes inside laptops, phones, e-scooters, e-cigarettes and mobility vehicles⁶, and fire services advise the same basic caution with all of them.

Fogstar Energy bundles and their contents

Fogstar Energy sells its rack batteries both individually and in bundles that pair batteries with an inverter, which is the component that converts the battery's direct current into the alternating current a home uses. The bundle range spans from a single 5.12kWh battery with inverter, listed from £1,598.95¹¹, up to a 10kWh 48V battery and inverter bundle from £2,242.95¹¹. Beyond the single-battery bundles, the range extends through pre-assembled multi-battery cabinet bundles, covered in detail in the cabinet section below.

The bundles matter because a battery on its own cannot power anything. Every system needs an inverter, and buying the two together as a pre-matched pair removes one layer of compatibility risk, though it does not remove the need for a competent installer. The larger configurations in the range are built as modular stacks in IP65-rated outdoor enclosures, meaning they are designed to sit outside, which is a different proposition from the indoor rack batteries that make up the core of the range and which need a cabinet, a shed or a garage.

Availability varies across the range, and popular configurations can carry a waiting list for the next production batch. Anyone planning an installation around a specific date should check current stock rather than assume immediate delivery.

Key specs of the Fogstar 5.12kWh rack battery

The core unit of the range is the Fogstar Energy 5.12kWh 51.2V rack battery, made by Fogstar Energy⁸. Its headline specification, as published by the maker, is as follows.

The 16S1P cell configuration means 16 cells in series and one in parallel, which is the arrangement behind the 51.2V nominal voltage. The 45.2kg weight is the figure to plan around for handling and for the load on whatever floor or wall the cabinet sits on. The discharge cut-off voltage of 43.2V is the point at which the battery stops giving out power to protect itself, which is distinct from the depth-of-discharge limit discussed below.

5,000 cycles and a 15-year design life

Fogstar rates the 5.12kWh rack battery for a 15-year design life and 5,000 cycles at 95% depth of discharge⁸. A cycle is one full charge and discharge, and 5,000 of them at one cycle per day works out at well over a decade of daily use, which is consistent with the 15-year design life. The 95% depth of discharge means 95% of the stored energy is usable on each cycle, so almost all of the 5.12kWh nameplate capacity is available in practice.

The related Fogstar Energy 48V 5.12kWh server rack battery is rated differently, at 4,000 cycles at 80% depth of discharge¹², so the two products should not be treated as identical despite the matching capacity. Where a maker quotes cycle life at a shallower depth of discharge, the same battery will typically last more cycles, which is why MCS advises that manufacturers usually provide an estimated lifespan in years or the number of full charge cycles estimated, and why the two figures should be read together¹³.

Independent guidance adds a warning that applies to any battery regardless of brand: the system should never let the battery discharge to zero, as this can significantly reduce the life of the battery¹⁴. In practice that means the battery management system and the inverter settings, not the owner, do the work of keeping the battery above its floor, but it is worth confirming at installation that the settings are right, because a battery run flat repeatedly will not reach its design life.

Operating in cold weather: discharge down to -20°C

The published specification for the 5.12kWh rack battery gives a discharge temperature range of -20°C to 60°C⁷, which means the battery can release its stored energy in conditions colder than any UK winter normally produces. That figure covers discharge only. Fogstar does not state a charging temperature range on the product pages, and charging a lithium battery below freezing is a known limit across the chemistry family, so households planning to install in an unheated garage or outbuilding should confirm the charging limits with the manufacturer or installer before buying rather than assume the discharge range tells the whole story.

Cold-weather capability matters more than it might seem, because a battery's job in a UK home is increasingly to power a heat pump through winter evenings. Heat pumps themselves work efficiently on cold days, down to temperatures as low as -20°C according to official guidance¹⁵, and Energy Saving Trust notes that heat pumps can perform down to -15°C or lower¹⁶. A Carmarthenshire case study recorded a house staying warm with outside temperatures down to -6°C over winter¹⁷. The battery that keeps a heat pump running through the coldest hours has to work in the same cold, which is why the discharge range is worth checking rather than glossing over.

The practical reading is straightforward: the discharge specification is reassuring, the charging specification is unstated, and the gap between them is exactly the kind of detail to pin down in writing before committing. Batteries installed indoors, or in a cabinet in a heated space, face much less of an issue than those in outbuildings.

Communications and inverter protocols: CAN and RS485

A rack battery is only half a system. It needs an inverter to charge from solar or the grid and to supply the house, and the two have to talk to each other reliably. Fogstar states that the 5.12kWh rack battery is compatible with major low-voltage inverter brands including Victron, Sunsynk and LuxPower, with inverter protocols pre-loaded⁷. Pre-loaded protocols mean the battery already contains the communication settings for those brands, so the installer does not have to configure the conversation from scratch.

The communication itself runs over CAN and RS485 connections, the two standard interfaces for linking batteries and inverters in domestic systems. Fogstar's wider range integrates with a variety of inverters, including Victron, Growatt, Sofar and Solis, using CAN and RS485 communication¹⁸. One detail worth noting for anyone planning a Victron system: Fogstar caps parallel connection at 31 batteries on Victron systems rather than the 32 allowed with other brands⁷, a small but real difference if a very large system is on the drawing board.

Brand-level compatibility is not the same as model-level compatibility, and this is where rack systems demand more of the installer than all-in-one units, which arrive as a matched pair from one maker. Households buying a rack battery and inverter separately should confirm the exact inverter model is supported, and our pages on comparing manufacturer specifications and solar inverter manufacturers cover how to check. The pre-loaded protocols reduce the risk, but they do not remove the need for the check.

Cabinet bundles from 5.12kWh up to 30kWh

The rack format's main advantage is that a system can start small and grow. Fogstar states that up to 32 batteries can be connected in parallel, or 31 for Victron systems, and that series connection is not supported⁷. Parallel connection keeps every battery at the same 51.2V nominal voltage while adding capacity, so a household can begin with one 5.12kWh unit and add more later without replacing anything.

Fogstar sells the scaling as pre-assembled bundles. The 15kWh 51.2V rack battery bundle is listed from £2,999.99⁴, and the 30kWh 51.2V rack glass cabinet battery bundle combines six 5.12kWh rack batteries for a total system capacity of 30.72kWh, at £5,749.94⁷. Both bundles carry the 10-year manufacturer-backed warranty⁷. The glass cabinet is the mounting and enclosure for the six batteries, and at 45.2kg per battery⁷, a six-battery system is a substantial load before the cabinet itself is counted, so the floor and fixings need to be up to the job.

The step from 5.12kWh to 30.72kWh is large in household terms. A typical domestic battery system in the UK runs between 4kWh and 10kWh¹⁹, so the 30kWh bundle is several times the size of the average installation, aimed at households with large solar arrays, high consumption, an electric vehicle to charge, or a heat pump to run through the evening peak. The parallel limit of 32 batteries means the format tops out far beyond almost any home's needs.

£899.99 price backed by a 10-year warranty

The single most striking figure in the Fogstar range is the battery-only price of the 5.12kWh rack battery at £899.99⁴. Around it sit the 48V 10kWh battery at £1,599.99 and the stackable 5kWh battery from £749.99, with the 15kWh rack bundle from £2,999.99⁴. The maker has also quoted a price of £156.25 per kWh for its stackable 5kWh battery¹⁸. The 5.12kWh server rack battery with inverter bundle is listed at £1,713.03, reduced from £1,861.99¹².

Against the wider market, these are low figures. Energy Saving Trust puts home battery storage at £1,500 to £10,000 depending on the type and size of battery, with a 5kWh battery system around £4,600⁵, and the same range is given in its UK-wide advice¹⁴. A UK Parliament briefing reports battery storage costs of up to £10,000 depending on size, with a typical 5kWh system around £4,600²⁰. For 8 to 10kWh batteries specifically, the battery-only price is £2,800 to £4,500, with an installed price of £4,500 to £7,000 as at March 2026²¹. Case studies in published research put a 10kWh battery at £4,000²². A typical domestic system of 4kWh to 10kWh in the UK usually costs between £2,500 and £10,000 fully installed¹⁹.

The gap between Fogstar's battery-only prices and typical installed prices is explained by everything the £899.99 does not include: the inverter, the cabinet, the wiring and protection, and the labour. The warranty is a 10-year manufacturer-backed warranty across the rack range⁷, which the maker describes as complete peace of mind⁷, and which it has also promoted alongside full UK-based support¹⁸. A 10-year term matches the longest warranties in the sector; what differs is the company behind it, and our page on manufacturer warranties covers what to check before relying on any of them.

How rack batteries support energy self-sufficiency at home

A home battery's core purpose is to store excess electricity produced by a solar system for use later⁹, and the independence gain is substantial when solar and storage are combined. A UK Parliament briefing cites Solar Energy UK's finding that combining rooftop solar with a battery could enable 80% of a household's annual electricity to be low-carbon²⁰. Uswitch data from June 2026 put the self-consumption rate for British households with solar panels at 70% with a 10kWh battery²³. Energy Saving Trust makes the same point from the heating side: combining solar panels with a home battery lets a household store renewable electricity to power a heat pump, making it less reliant on grid electricity¹⁶.

The independence is real but not total, and the limits should be stated as firmly as the benefits. A battery does not generate anything: without solar, it simply shifts grid electricity from cheap hours to expensive ones, which saves money but keeps the household dependent on the grid and on a supplier's tariff structure. The system should never let the battery discharge to zero, as this can significantly reduce the life of the battery¹⁴, so a margin of grid dependence is built into the design. And the battery's own intelligence depends on the inverter brand and its firmware, a dependency covered on our page about firmware updates and product support life.

There is also a system-level benefit that runs the other way. Solar Energy UK notes the combined potential of millions of homes with batteries to help balance supply and demand across the country by releasing stored power onto the grid when needed⁹, and the Energy Storage Association is working with industry, manufacturers and the Department for Energy Security and Net Zero on exactly this agenda²⁴. A household with a battery can, if it chooses, sell that flexibility back. Around 19 million UK households could enjoy the benefits of home charging for an electric vehicle²⁵, and a large rack system is one way to charge a car from stored solar rather than the evening grid. The rack format's expandability means a household can grow into that position one 5.12kWh unit at a time, which is the strongest independence argument it has.