Solar Battery Storage Costs UK — What to Charge for Battery Storage Installation in 2026
Battery storage is one of the fastest-growing segments in renewable energy installation. With electricity prices remaining high and the government's net-zero push continuing, more homeowners want to pair solar panels with a battery — or retrofit a battery to an existing solar system. For solar installers and electricians, this creates a significant opportunity, but only if you quote accurately and understand all the cost components involved.
This guide breaks down solar battery storage costs for the UK in 2026: supply prices by battery size, typical installation costs, brand comparisons, regulatory requirements, VAT rules, and quoting tips to help you price profitably.
Battery Storage Costs by System Size (Supply & Install, 2026)
The total price a customer pays depends on the battery capacity they need, the brand specified, the complexity of the installation, and whether any additional electrical work (consumer unit upgrade, inverter replacement) is required. Here are realistic supply-and-install ranges for the most common residential configurations.
5kWh Battery — £2,500 to £4,500 fitted
Examples: GivEnergy 5.2kWh, SolarEdge Home Battery 5kWh
A 5kWh battery suits smaller solar systems (2–3kWp panels) or households with modest evening demand. It stores roughly one evening's worth of electricity for a smaller home. This is the entry-level option and the most price-sensitive — customers will often compare online quotes.
10kWh Battery — £4,000 to £7,500 fitted
Examples: GivEnergy 9.5kWh, Pylontech US3000C (2-stack), Tesla Powerwall 2 (13.5kWh)
The 10kWh range is the most popular residential choice. It pairs well with a 4–6kWp solar array and covers most of a typical 3–4 bedroom home's overnight usage. The Tesla Powerwall 2 sits at 13.5kWh usable and tends to come in at the top of this bracket. The Pylontech stackable units are popular with installers who want to spec flexible capacity.
15kWh Battery — £6,000 to £11,000 fitted
Examples: GivEnergy 19.9kWh, Tesla Powerwall 3 (13.5kWh), SolarEdge Home Hub
Larger batteries are suited to high-consumption households, properties with EVs, or customers wanting maximum self-sufficiency. The GivEnergy 19.9kWh is popular in this bracket. Note that the Powerwall 3 includes an integrated inverter (6kW hybrid), which can simplify the install but is system-specific. The SolarEdge Home Hub combines the inverter and battery management in one unit, suited to SolarEdge solar systems.
20–30kWh (Large Residential / Small Commercial) — £10,000 to £20,000+
Multiple-stack or commercial-grade systems for high-demand properties, small businesses, or farms. At this scale, three-phase inverters, larger consumer unit work, and potentially G99 DNO applications come into play. Always survey these jobs individually — costs vary too widely for a standard price list.
Popular Battery Brands: 2026 Comparison
Specifying the right battery for each customer requires balancing usable capacity, warranty length, chemistry (LFP is safer and longer-lasting; NMC is more energy-dense but less cycle-stable), and supply cost. Here's how the main brands stack up.
| Brand / Model | Usable Capacity | Warranty | Chemistry | Approx. Supply Cost |
|---|---|---|---|---|
| GivEnergy 9.5kWh | 9.5 kWh | 10 yr / 6,000 cycles | LFP | £2,800 – £3,600 |
| GivEnergy 19.9kWh | 19.9 kWh | 10 yr / 6,000 cycles | LFP | £5,500 – £7,000 |
| Tesla Powerwall 2 | 13.5 kWh | 10 yr / unlimited cycles | NMC | £4,000 – £5,500 |
| Tesla Powerwall 3 | 13.5 kWh (inc. 6kW inverter) | 10 yr / unlimited cycles | LFP | £5,000 – £6,500 |
| SolarEdge Home Battery 5kWh | 4.6 kWh | 10 yr | LFP | £1,800 – £2,800 |
| Huawei LUNA2000 10kWh | 10 kWh | 10 yr | LFP | £3,000 – £4,200 |
| Growatt ARK 10kWh | 10 kWh | 10 yr / 6,000 cycles | LFP | £2,800 – £3,800 |
| Pylontech US3000C (5.1kWh per unit) | 5.1 kWh per module | 10 yr | LFP | £1,400 – £2,000 per module |
Supply costs are installer trade prices and vary by distributor, volume discount, and market conditions. Always check your distributor's current price list before quoting.
What Does a Battery Storage Installation Involve?
Battery storage installs are not plug-and-play. Each job requires a proper survey and a methodical installation process. Here's what the work typically covers.
1. Pre-installation Site Survey
- Consumer unit capacity: Check the existing CU has sufficient ways for the battery circuit. If it's a full older CU, factor in the cost of an upgrade (see below).
- Grid connection and DNO: Confirm whether the property is single-phase or three-phase and assess the available headroom on the supply. Larger systems may require G99 notification and formal DNO approval before work starts.
- Battery location: Garage, utility room, or loft? Cable runs, ventilation, and temperature exposure all affect installation complexity. LFP batteries are safer for indoor locations than NMC, but both need to be within manufacturer temperature ranges.
- Existing solar setup: If retrofitting a battery to an existing solar system, check the inverter brand and model. Not all inverters are battery-compatible — some will require replacement with a hybrid inverter.
- Cable runs: Measure the distance from battery location to CU and to the inverter. Long runs increase materials costs and labour time significantly.
2. DC-Coupled vs AC-Coupled Installation
The coupling method affects which batteries and inverters can be used, and influences overall system efficiency.
Battery connects directly to the solar array before the inverter. More efficient (one conversion step), but requires a compatible hybrid inverter. Best specified on new solar installs or when replacing the inverter anyway.
Battery connects on the AC side with its own inverter/charger. Easier to retrofit to an existing solar system without replacing the solar inverter. Slightly less efficient due to double conversion, but highly flexible.
3. DNO Notification — G98 vs G99
Any battery storage system connected to the grid requires notification to the Distribution Network Operator (DNO). The process depends on system size:
For systems up to 16A per phase (approximately 3.68kW single-phase, 11kW three-phase). Installer notifies DNO within 28 days of commissioning. No prior approval needed. Most residential battery installs fall under G98.
For systems above 16A per phase. Requires a formal application to the DNO before installation begins, with a review period that can take weeks. Factor this into project timelines and quote the DNO application as a separate line item.
4. Consumer Unit Upgrade
Many older properties have split-load or older consumer units without sufficient ways for a battery circuit, or boards that aren't suitable for an additional high-current breaker. If a CU upgrade is needed, add £500–£1,200 to the quote (consumer unit, cable, labour, and Electrical Installation Certificate). Always flag this at survey stage — springing it on the customer after they've accepted your quote damages trust and margin.
5. Commissioning and MCS Registration
Once installed, the system must be commissioned, tested, and the customer given a handover pack with system documentation, warranty information, and instructions for use. If MCS-certified (see below), the installation must be registered on the MCS database and the customer issued an MCS certificate — which they need for VAT zero-rating confirmation and any grant eligibility. Allow half a day for commissioning on a straightforward domestic battery install.
MCS Certification for Battery Storage Installers
MCS (Microgeneration Certification Scheme) certification is not legally mandated for all battery storage installations, but it is effectively required for:
- VAT zero-rating on domestic installations (HMRC requires the installer to be a competent person registered under a government-recognised scheme — MCS fulfils this requirement)
- Eligibility for grant schemes including SEG (Smart Export Guarantee) — energy suppliers typically require MCS certification to approve export payments
- Consumer confidence — many customers specifically request MCS-certified installers, particularly for larger installs
Alternatives include HIES (Home Insulation & Energy Systems) and RECC (Renewable Energy Consumer Code) membership, which also provide consumer protection frameworks. However, MCS is the most widely recognised and directly linked to VAT zero-rating.
MCS Certification Costs
For most active battery installers doing 2+ jobs per month, the VAT zero-rating alone justifies the MCS cost. On a £5,000 battery install, 20% VAT would be £1,000 — removing that makes you immediately more competitive on price.
VAT on Battery Storage Installations — The 2024 Rule Change
This is one of the most important pricing developments in recent years for battery installers. Since February 2024, standalone battery storage systems installed in domestic dwellings are zero-rated for VAT — even when installed without solar panels.
Previously, only battery storage installed at the same time as solar panels qualified for zero-rate VAT. Retrofitting a battery to an existing solar installation attracted 20% VAT. This significantly disadvantaged installers quoting for the large market of homeowners who already had solar and wanted to add a battery.
What this means in practice:
A 10kWh battery retrofit quoted at £5,500 now carries £0 VAT for domestic customers (previously would have been £1,100 VAT on top). This is significant for the customer's decision and for your competitiveness. Always confirm the current HMRC guidance applies to the specific job before quoting — the zero-rating applies to installation in dwellings and has conditions. Commercial or mixed-use properties are treated differently.
Note: VAT rules can change. Verify current HMRC guidance (Notice 708/6) for the latest position before issuing quotes, especially for edge cases (new builds, commercial premises, battery-only installs vs combined systems).
Grant Schemes & Incentives for Battery Storage (2026)
Understanding the grant landscape helps you advise customers and position your quote — even where grants don't directly reduce your invoice, they affect the customer's overall cost perception.
Smart Export Guarantee (SEG)
The SEG requires licensed electricity suppliers with 150,000+ customers to offer an export tariff to small-scale renewable generators. Battery owners with solar panels can charge from solar during the day and either use stored power in the evening or export surplus. SEG rates vary by supplier — typically 3–15p/kWh, with some suppliers offering higher time-of-use rates. To qualify, the system must be MCS certified and have a smart meter capable of measuring export. This ongoing income stream improves the ROI case for the customer and is worth including in your customer conversations.
ECO4 Scheme
The Energy Company Obligation (ECO4) scheme primarily covers insulation, heating system upgrades, and low-income household energy efficiency measures. Battery storage is not typically funded under ECO4 as a standalone measure. However, where battery storage is part of a broader renewable energy package on a qualifying property, some local authority flex funding may apply. Check with your local authority energy team.
Local Authority & Regional Schemes
Many local councils run their own energy efficiency grant programmes, sometimes including battery storage as part of solar packages. These vary significantly by region and often have limited funding windows. Advise customers to check their Local Council Energy Advice (LCEA) service and the government's Simple Energy Advice portal for current local schemes. Being able to point customers toward grant opportunities — even when the grant doesn't flow through you — builds trust and helps close the sale.
How to Advise Customers on Battery Sizing
Oversizing a battery wastes the customer's money and gives poor ROI. Undersizing it means poor self-sufficiency and a disappointed customer. Getting the sizing right is part of the professional value you bring. Here's a practical framework.
Quoting Battery Storage Jobs: What to Include
Battery storage quotes have more moving parts than a straightforward solar install. Being thorough at the quoting stage prevents margin erosion and protects your relationship with the customer.
Always survey in person before quoting
Phone or email quotes for battery storage are a recipe for unexpected costs mid-job. You need eyes on the consumer unit, the proposed battery location, the cable run distances, and the existing solar inverter (if retrofitting). A site visit typically takes 30–60 minutes and prevents hours of expensive surprises on installation day.
Confirm inverter compatibility before specifying a battery
This is the single most common error on retrofit jobs. If the existing solar inverter is not compatible with the battery you're quoting, you'll either need to use AC-coupling (which may not be what was quoted) or replace the inverter (additional cost). Check the inverter make, model, and firmware version during your survey. Many manufacturers publish compatibility lists — use them.
Check single-phase vs three-phase
Three-phase properties require three-phase inverters and battery systems, which are more expensive and less common in the domestic residential market. Confirm phase supply at the survey stage. An incorrectly specified inverter on a three-phase property can require a complete resupply.
Quote each element as a separate line item
Transparent, itemised quotes build trust and reduce haggling. Customers who understand what each element costs are less likely to try to cut corners on critical components. A well-structured battery quote should include:
- — Battery supply (brand, model, capacity)
- — Hybrid inverter supply (if required)
- — Battery gateway / monitoring unit (if separate)
- — Installation labour (battery mounting, wiring, commissioning)
- — Cable and containment materials
- — Consumer unit upgrade (if required — quoted separately to avoid price shock)
- — DNO application fee (G98 notification included; G99 application as a separate line)
- — MCS registration and certificate
- — Electrical Installation Certificate
Set clear payment terms
Battery storage jobs involve significant materials outlay. A typical structure is 25–30% deposit on quote acceptance to cover material ordering, balance on completion. For larger commercial installs, consider a staged payment milestone when materials are delivered to site. Always get the deposit before ordering — battery units are not returnable through most distributors.
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