Battery Storage Hampshire: Costs, Brands and Installation

Battery storage in Hampshire costs roughly £3,200–£4,800 installed for a 5 kWh system, £4,500–£6,800 for 10 kWh and £9,000–£13,000 for 20 kWh — all at 0% VAT on domestic installs until 31 March 2027. A battery stores cheap off-peak or self-generated electricity and releases it through the 4–8pm peak, which is where the bulk of the saving comes from on a south-coast home.

I'm Tom, and I run Solent Solar from Whiteley in Fareham. One small team, every install — my team and I do the survey, design the system, fit it and commission it ourselves, so the people who told you what it would do are the people who have to make it do that. Every install is MCS-certified and HIES-covered, and I handle the SSEN G98 or G99 application as part of the job rather than leaving it with you.

Below: what a battery actually costs by size, which brands I fit in 2026 (and why I stopped fitting GivEnergy), how the grid connection works in the SSEN area, where the battery is and isn't allowed to go in a Hampshire house — including the coastal properties — and the town pages for your area.

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Battery storage costs in Hampshire: 2026 prices by size

The figures below are what I would expect to quote for a straightforward Hampshire install in 2026 — battery, hybrid or AC-coupled inverter, isolation and protection, labour, commissioning, MCS certificate and the SSEN paperwork. They assume the 0% VAT rate on domestic battery installations, which runs until 31 March 2027 and then reverts to 5% on 1 April 2027. Commercial installs are charged at 20% VAT, recoverable if you are VAT-registered.

Indicative installed battery costs, Hampshire, 2026 (0% VAT, subject to survey)
Battery size	Nearest real configuration I'd fit	Indicative installed cost	Typical Hampshire home	What it covers on a winter evening
5 kWh	SigenStor 6.02 kWh (single module) or a Fox ESS EP5 (5.18 kWh nominal, 4.66 kWh usable)	£3,200 – £4,800	One or two-bed flat, bungalow, low-usage household	Lights, TV, fridge and an electric oven through the 4–8pm peak. Won't stretch to an EV or electric heating.
10 kWh	Fox ESS EP11 (10.36 kWh nominal, 9.32 kWh usable) or GoodWe Lynx Home F G2 9.6 kWh (3 × 3.2 kWh)	£4,500 – £6,800	Three-bed semi or detached — the most common install I do	A full evening peak plus overnight base load. Most nights it gets you to the cheap early-morning window without buying peak units.
13 kWh	GoodWe Lynx Home F G2 12.8 kWh (4 × 3.2 kWh) or SigenStor 12.04 kWh (2 modules)	£5,800 – £8,500	Four-bed family home, or a three-bed with an EV	Evening and overnight for a four-bed, or an evening plus roughly 20–25 miles of EV charge (at about 3.5 miles per kWh — adjust for your car).
20 kWh	2 × Fox ESS EP11 (20.72 kWh), GoodWe 19.2 kWh (6 × 3.2 kWh) or SigenStor 18.06 kWh (3 modules)	£9,000 – £13,000	Large home with an EV, a heat pump, or both	A full day of midwinter base load, or an evening's use plus roughly 40–50 miles of EV range. Enough to buy nearly all your electricity off-peak.

Two things a price table can never tell you, and both come out on the survey:

Nominal capacity isn't usable capacity. A Fox ESS EP11 is badged 10.36 kWh but gives you 9.32 kWh usable at its 90% depth of discharge, and you lose a little more to round-trip losses — LFP systems in this class typically quote round-trip efficiency in the low-to-mid 90s. Size on what you actually use between 4pm and 7am, not on the badge.
Your house sets the price more than the kilowatt-hours do. A tired consumer unit, a long cable run from the garage to the meter, poor earthing, or the need for scaffolding to reach an existing array will move a quote by four figures. I'd rather find that on a free survey than discover it on install day.

For a national breakdown of the cost drivers, see our UK battery storage cost guide. For funding, read battery grants in Hampshire for 2026 — the honest answer is that most Hampshire households pay for a battery themselves, with 0% VAT doing most of the heavy lifting rather than a grant.

The batteries I fit in Hampshire — and why GivEnergy is off the list

I deliberately keep the range narrow. Three brands means I know each system's commissioning quirks, firmware behaviour and fault patterns properly, rather than fitting a dozen badges badly. A battery warranty has two limits, a term and an energy floor, whichever comes first; how long a solar battery lasts works both out in years.

Battery brands fitted by Solent Solar, 2026
Brand	How it scales	Warranty	Why I fit it	Honest caveat
SigEnergy SigenStor	6.02 kWh LFP modules (5.84 kWh usable), up to six per stack — 54.24 kWh	10 years as standard, guaranteeing 60% capacity retention, extendable to 15 years if bought within 12 months of commissioning	Inverter, battery and optional DC EV charging in one stack, with an IP66 rating so it can live on an outside wall without building an enclosure around it. The tidiest solution for houses with no garage.	Premium pricing, and it is the newest of the three in the UK, so it has the shortest field record here. The separate Sigen Energy Gateway carries only a 5-year warranty.
Fox ESS	EP11 at 10.36 kWh (9.32 kWh usable), four units to 41.44 kWh; EP5 at 5.18 kWh for tighter spaces	5 years as standard, extended to 10 years free on registration with Fox ESS — I register every install myself so the full term is in place before I leave	Large UK installed base, over 95% round-trip efficiency, integrated cell heater for outdoor use in a UK winter, and spares and technical support that answer quickly. When something needs replacing, that matters more than a spec sheet.	It's a 384 V high-voltage stack — it needs proper clearances and a sensible location, not a cupboard stuffed behind a boiler. And the 10-year term depends on that registration actually being done.
GoodWe	Lynx Home F G2 in 3.2 kWh LFP modules, two to nine per tower — 6.4 kWh to 28.8 kWh	10-year product warranty on the battery	The best value of the three, and it pairs cleanly with GoodWe's BH, EH, BT and ET inverters if you want one manufacturer end to end.	Rated IP55 rather than the SigenStor's IP66 — outdoors it wants a genuinely sheltered elevation, not an exposed one. The tower is also a fixed footprint, so decide your final capacity at design stage rather than assuming you'll squeeze more in later.

Why I no longer fit GivEnergy

GivEnergy Ltd entered administration on 9 April 2026, ceased trading and made its staff redundant. The practical consequence for buyers is that hardware warranties written by that company are no longer being honoured by it, so a new GivEnergy install today would be sold with a warranty that has no manufacturer standing behind it. I stopped fitting it the same month.

If you already own one, don't panic: installed systems continue to operate, and the app and monitoring platform sit inside a separate legal entity, GivEnergy Software Ltd, which is not in administration. I still service, fault-find and re-commission existing GivEnergy systems across Hampshire — and if yours does eventually fail, I can usually retrofit a different battery to a working existing array. There's more detail in our guide on what the GivEnergy administration means for owners, and a like-for-like ranking of the current options in the best solar battery for 2026.

Grid connection in Hampshire: SSEN, G98 and G99

Every property in the Solent area sits in the Scottish and Southern Electricity Networks (SSEN) Southern licence area — Southampton, Portsmouth, Fareham, Winchester, Eastleigh, Havant, Basingstoke and Andover are all in Southern Electric Power Distribution, distribution area 20. SSEN is the distribution network operator, not your electricity supplier, and it is SSEN that has to approve or be told about anything you connect that can push power back onto the network.

G98 versus G99 for a Hampshire home battery
	G98	G99
Applies to	Up to 3.68 kW per phase (16 A at 230 V)	Anything above 3.68 kW per phase
When you apply	Notify SSEN within 28 days after commissioning	Full application and written SSEN acceptance before installation
Timing	Connect and notify — no waiting	SSEN can take up to 45 working days to respond to a standard application; its G99 Fast Track route targets 10 working days for straightforward domestic connections. Plan in weeks, not days.
Typical Hampshire battery	Small standalone retrofit on a modest inverter	Most hybrid systems, most solar-plus-battery installs, anything with an EV charger in the same stack

Two things worth knowing before anyone quotes you. First, if SSEN limits what you're allowed to export in your street, that usually isn't the end of the job — an export limitation scheme can be applied so the inverter holds export to the permitted figure and the install goes ahead, you just earn slightly less from export. Second, your MCS certificate is what your supplier will ask for before paying you under the Smart Export Guarantee, alongside an export-capable smart meter, so the paperwork isn't optional admin — it's the thing that turns the system into an income stream.

I complete and submit the G98 or G99 myself, including the schematic and the equipment datasheets SSEN asks for, and I don't book an install date until a G99 has been accepted. Full service detail is on the battery storage service page.

Where the battery goes: garages, outside walls, and why the loft is out

Siting is the part of a battery job most quotes skate over, and it's governed by real standards — the MCS battery installation standard (MIS 3012:2025) and the PAS 63100:2024 fire-safety specification for home batteries, alongside BS 7671 for the electrical work. Those documents decide what is and isn't allowed long before anyone's preference does, and as an MCS installer I work to them.

The places a Hampshire battery can and can't go

Garage — the default, and usually the best. Stable temperature, short cable run to the consumer unit, easy access for service. Integral garages on the estates around Whiteley, Locks Heath, Hedge End and Chandler's Ford are close to ideal.
Loft — ruled out. This is the location homeowners ask for most and the answer is no. PAS 63100:2024 states that batteries shall not be installed in voids, roof spaces or lofts. It isn't a judgement call I get to make: a 60–100 kg unit sitting above a plasterboard ceiling in a fire, summer loft temperatures well outside the cells' rated range, and firefighters having to work directly beneath it are why the clause exists. If an installer offers you a loft battery in 2026, that tells you something.
Outside wall — increasingly the answer. SigenStor is IP66-rated for outdoor installation without an extra enclosure; the GoodWe Lynx Home F G2 is IP55 and wants a sheltered elevation. Either way PAS 63100 asks for outdoor units to be kept at least a metre clear of escape routes, doors, windows and ventilation openings. For a Victorian terrace in Southampton or Portsmouth with no garage and no side access, an outdoor unit is often the only workable option.
Utility room or plant room. Possible with proper fire separation, ventilation and clearances. But bedrooms, rooms used for sleeping, cupboards opening off bedrooms, and hallways, stairs and landings used as escape routes are all excluded — which is why the under-stairs cupboard, the other thing I get asked for constantly, is a no.

Coastal properties: salt air is a real design input

A significant share of my work is within a mile or two of the water — Gosport, Lee-on-the-Solent, Hayling Island, Portchester, Southsea, Warsash, Emsworth. Salt-laden air attacks enclosures, fixings and heat sinks far faster than it does inland at Winchester or Alton. On coastal jobs I site outdoor units on the sheltered elevation rather than the exposed seaward side, use stainless fixings, keep them clear of direct spray and standing salt, and check the manufacturer's corrosion rating against the location — this is where the difference between an IP66 and an IP55 enclosure stops being a spec-sheet detail. Related reading: solar panels and salt air on the Solent coast.

On planning: a battery on an external wall of a house is normally permitted development, but the answer changes inside a conservation area, on a listed building, and within the New Forest and South Downs National Parks — both of which cut across the county. Hampshire's district and borough councils, plus the unitary authorities at Southampton and Portsmouth, don't all interpret external equipment identically. I check your specific address before I quote a location.

Making a Hampshire battery pay: tariffs, retrofits and export

A battery earns its money in one of two ways, and on the south coast most systems use both.

1. Time-of-use tariff arbitrage

You charge the battery when electricity is cheap and use it when it's expensive. Octopus Cosy, for example, runs three cheap windows a day — early morning, early afternoon and late evening — which suits a battery and a heat pump; Intelligent Octopus Go suits EV households; Agile follows the wholesale market half-hour by half-hour. Octopus paused new sign-ups to Flux and Intelligent Flux in March 2026; standard Flux was taking new customers again when we checked on 16 September 2026, and Intelligent Flux only works with batteries on Octopus's compatibility list — so check what is open to you, and whether your battery qualifies, before you build a business case on a headline rate. Our guide to running Octopus Agile with solar and a battery goes through the mechanics. As of 7 October 2026 Octopus says Intelligent Octopus Flux is currently exclusive to customers who bought solar panels and a battery from Octopus; our Intelligent Octopus Flux guide has the rates and the battery list.

Because this saving is tariff-driven rather than sunshine-driven, a battery works in Hampshire without solar panels at all — genuinely useful for north-facing roofs, listed properties and flats where an array isn't practical.

2. Self-consumption and export

South-coast arrays typically yield in the region of 950–1,050 kWh per kWp per year for a well-oriented array, which is at the good end for the UK — but without storage, a large slice of that generation goes to the grid in the middle of the day and you buy it back at peak rates in the evening. Adding storage lifts self-consumption substantially, and it's the single biggest change you can make to an existing array. Smart Export Guarantee rates sat across a very wide band in mid-2026 — from around 3p per kWh at the bottom to about 20p on the best openly available tariffs, with some suppliers paying more again to customers who also buy their import electricity from them, and time-of-use export tariffs paying more at peak. Treat any specific rate as something to confirm with your supplier, not a promise. See SEG rates for 2026.

Retrofitting to solar someone else installed

I retrofit batteries onto existing arrays every month, including plenty installed by companies that are no longer trading. An AC-coupled retrofit leaves your existing inverter and array alone, which keeps things simple if you're still on an old Feed-in Tariff — though you should tell your FiT supplier that you've added storage. The step-by-step is in how to add battery storage to existing solar panels, and the county-wide solar picture is on our Hampshire solar panels hub.

Battery storage across Hampshire and the Solent

I'm based at Whiteley in Fareham (PO15) and work a roughly 30-mile radius around the Solent. Because my own small team fits everything, coverage is honest rather than aspirational: the closer you are to Fareham, the quicker we can get to you for a survey or a service call.

Battery storage Southampton — terraces, HMOs and city properties, often outdoor or utility-room siting
Battery storage Portsmouth — Portsea Island housing stock and coastal salt-air considerations
Battery storage Fareham — my home patch, including Whiteley, Titchfield and Portchester
Battery storage Winchester — conservation areas, listed buildings and village properties
Battery storage Eastleigh — modern estates with integral garages, the easiest installs I do
Battery storage Havant — including Emsworth, Hayling Island and Waterlooville
Battery storage Basingstoke — northern edge of my radius, still covered
Battery storage Andover — northern edge of my radius, still covered

Not sure which size you need? Send me your last four quarterly bills or a screenshot of your smart meter data and I'll size it against what you actually use, not what's easiest to sell. Book a free survey or read more on the battery storage service page. Our guide to what size solar battery you need shows the working, and the solar panel calculator runs it on your own figures.

Local knowledge that matters here

Scottish and Southern Electricity Networks (SSEN) is the distribution network operator for the entire Solent area — Southampton, Portsmouth, Fareham, Winchester, Eastleigh, Havant, Basingstoke and Andover are all in the SSEN Southern licence area, so every Hampshire battery connection goes through SSEN's G98/G99 process.
Solent Solar is based at Whiteley, Fareham (PO15), working a roughly 30-mile Solent radius — Basingstoke and Andover sit at the northern edge of that radius, which is stated honestly on the page rather than claimed as equal coverage.
Coastal salt-air corridor named specifically: Gosport, Lee-on-the-Solent, Hayling Island, Portchester, Southsea, Warsash and Emsworth — outdoor battery siting on these properties uses the sheltered elevation, stainless fixings and a corrosion-rating check, versus inland Winchester or Alton where this is not a design input.
Hampshire housing-stock siting reality: modern estates around Whiteley, Locks Heath, Hedge End and Chandler's Ford have integral garages (ideal siting); Victorian terraces in Southampton and Portsmouth have no garage and no side access, which is why outdoor IP66-rated units are often the only workable option.
Planning varies by authority within the county — the New Forest and South Downs National Parks both cut across Hampshire, and the district/borough councils plus the Southampton and Portsmouth unitary authorities do not interpret external equipment identically, so the address is checked before a siting is quoted.
South-coast array yield of roughly 950–1,050 kWh per kWp per year is used as the sizing basis, which is at the favourable end of the UK range and shapes how much surplus there is to store.
GivEnergy Ltd entered administration on 9 April 2026 and Solent Solar stopped fitting the brand that month — existing Hampshire GivEnergy systems are still serviced and can be retrofitted with an alternative battery onto the working array.

Frequently asked questions

How much does battery storage cost in Hampshire?

For a 2026 Hampshire install at 0% VAT, expect roughly £3,200–£4,800 for a 5 kWh system, £4,500–£6,800 for 10 kWh, £5,800–£8,500 for 13 kWh and £9,000–£13,000 for 20 kWh, fully installed and commissioned with the MCS certificate and SSEN paperwork included. The variables that move a quote most are not the kilowatt-hours but the property: consumer unit condition, cable run length from the battery position to the meter, earthing arrangement, and whether scaffolding is needed to reach an existing array. The 0% VAT rate on domestic battery installations runs until 31 March 2027 and reverts to 5% on 1 April 2027, so a 2026 install captures the lower rate.

Can I put a battery in my loft?

No. PAS 63100:2024, the fire-safety specification for home battery storage, states that batteries shall not be installed in voids, roof spaces or lofts, and as an MCS-certified installer I work to it. The reasons are sound: a 60–100 kg unit above a plasterboard ceiling is a serious hazard in a fire, loft temperatures on a south-facing Hampshire roof in summer sit well outside the cells' rated operating range, and it puts the battery directly above where people sleep and above where firefighters would have to work. Bedrooms, cupboards opening off bedrooms, and hallways, stairs and landings used as escape routes are excluded too. The compliant options are a garage, an external wall, a ground enclosure, or a utility or plant room with proper fire separation and ventilation.

Do I need planning permission for a home battery in Hampshire?

For most Hampshire houses, no — a battery on an external wall or inside a garage is normally permitted development. The exceptions matter locally: conservation areas, listed buildings, and properties inside the New Forest or South Downs National Parks, both of which cut across the county. Flats and some new-build estates can also carry planning conditions or covenants that restrict external equipment. Separately from planning, siting is governed by the MCS battery installation standard (MIS 3012:2025) and the PAS 63100:2024 fire-safety specification, which rule out lofts, bedrooms and escape routes outright and require outdoor units to be kept at least a metre clear of escape routes, doors, windows and ventilation openings — that is usually the constraint that decides the location, not planning. I check your specific address before quoting a position.

Can I add a battery to solar panels that another company installed?

Yes, and it is a large part of what I do — including arrays fitted by companies that have since stopped trading. An AC-coupled retrofit leaves your existing inverter and panels untouched and simply adds the battery and its own inverter alongside, which is the simplest route if your original system still works well or you are on an old Feed-in Tariff. If your existing inverter is near end of life, replacing it with a hybrid unit can be better value than retrofitting around it. Storage typically lifts the share of your own generation that you actually use, rather than exporting it cheaply and buying it back at peak rates. If you are on the Feed-in Tariff, notify your FiT supplier that you have added storage.

What happens to my GivEnergy battery now the company is in administration?

Your system keeps working. GivEnergy Ltd entered administration on 9 April 2026 and ceased trading, but installed hardware continues to operate and the app and monitoring platform sit inside a separate legal entity, GivEnergy Software Ltd, which is not in administration. The real change is warranty: hardware warranties written by GivEnergy Ltd are no longer being honoured by that company, so you are relying on your installer and on consumer-law routes rather than a manufacturer-backed warranty. I still service, fault-find and re-commission existing GivEnergy systems across Hampshire, and if a unit does eventually fail I can usually retrofit a different battery onto the existing array. I no longer sell new GivEnergy equipment.

Do I need a G99 application for a battery in Hampshire?

Most likely yes. G98 covers installations up to 3.68 kW per phase (16 A at 230 V) and is a notify-within-28-days-of-commissioning process. Anything above that threshold requires a G99 application with written acceptance from SSEN before the equipment is installed — which covers most hybrid systems, most solar-plus-battery installs, and anything sharing a stack with an EV charger. SSEN can take up to 45 working days to respond to a standard G99 application, though its Fast Track route targets 10 working days for straightforward domestic connections, so a G99 job needs planning in weeks rather than days, and I do not book an installation date until acceptance is in hand. If SSEN limits permitted export on your street, an export limitation scheme can be applied and the installation still proceeds — you simply export less. I prepare and submit the application, schematic and datasheets as part of the job.

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Tom and his team survey, design and fit every system. Get a free, no-pressure quote.

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Get a free, no-pressure quote

Tom and his small team survey, design and install every system. Tell us where you are and what you are considering — you will get a straight answer, not a sales call.