EV-charging storage is often the cheapest way to add chargers, because the alternative is a costly DNO reinforcement and a long queue. Rapid and ultra-rapid chargers create short, severe demand spikes; a battery charges off-peak and from any on-site solar, then discharges into those spikes, so the connection sees a smoothed load rather than the raw charger peak.
The install is a combined-system design: the battery, its protection and the chargers share the LV or HV infrastructure and metering, and a G100 limitation scheme holds the whole site within its agreed import and export capacity. We design storage and charging together so the commissioning proves the combined behaviour, not just the battery in isolation.
How we install ev charging hub storage install
Delivery runs: model the charging demand profile against the existing connection; design the shared LV/HV distribution, protection and metering; install the battery and charging infrastructure together; commission the G100 limitation and the buffered charging behaviour under load; witnessed testing across storage and chargers.
What this install includes
- Buffers rapid/ultra-rapid charger demand spikes so more chargers fit on the existing connection
- Installed alongside the charging infrastructure with shared LV/HV design and metering
- G100 limitation holds the combined site within agreed import/export capacity
- Faster to deploy than a DNO reinforcement for fleet depots and forecourts
Typical ev charging hub storage install
- Power / capacity
- 100 kW / 200 kWh-1 MW / 2 MWh
- Project value
- £120,000-£1.4m
- Payback
- 7 years
Budget and capital allowances
Budget £120,000-£1.4m for this install, with a 7-year simple payback. On tax, a ev charging hub storage install qualifies for 100% AIA on the first £1m and a 50% first-year allowance on the balance (special-rate — not full expensing); we model capital, finance and lease routes side by side. See the cost guide, capital allowances and grants and funding.
Siting, fire and compliance
Fire separation between the battery enclosure and the charging bays is engineered per insurer and NFCC guidance, to PAS 63100:2024 principles and BS EN 62619 / BS EN 62933, with the charger installation to BS 7671 and OZEV requirements where grant-funded.
G99/G100 for storage and the combined site; charger installation to BS 7671 and OZEV scheme requirements where grant-funded. Fire separation between battery enclosure and charging bays per insurer and NFCC guidance. Coordinated commissioning of storage and chargers.
Getting it connected and signed off
Delivering a ev charging hub storage install means owning the G99 process end to end — application, protection settings, DNO liaison and G100 limitation on constrained networks — with the metering engineered for accurate control and settlement. Every install ends with a documented, witnessed commissioning and an O&M handover pack. Read our honest view on whether it is worth it.
EV Charging Hub Storage Install: at a glance
| Attribute | Typical for this install |
|---|---|
| Power / capacity | 100 kW / 200 kWh-1 MW / 2 MWh |
| Siting | n/a |
| Project value | £120,000-£1.4m |
| Simple payback | 7 years |
| Connection | G99 (G100 limitation where constrained) |
Get a free ev charging hub storage install feasibility
Responds within one working day
- 1. Free desk feasibility from your meter data and roof, no obligation.
- 2. Site survey and a fixed-price proposal, itemised in writing.
- 3. Install and aftercare by MCS-certified engineers.
- MCS Certified
- NICEIC
- RECC
- TrustMark
Common questions
How long do the batteries last once installed?
Quality LFP commercial cells are typically warranted for around 6,000-10,000 cycles or 10 years to roughly 70% retained capacity, with real-world life often longer. We size with end-of-life capacity in mind so the system still meets its target late in life, and plan augmentation (adding cells) where it makes sense. The warranted cycle count and degradation curve are stated in every proposal.
Can you install storage to support new EV charging?
Yes, and it is often the cheapest way to add chargers. Rapid and ultra-rapid chargers create short, severe demand spikes that can trigger an expensive grid upgrade. A battery buffers those spikes, charging off-peak and from any on-site solar, so more chargers fit on your existing connection. We design the storage, protection, and charging infrastructure together and hold the combined site within its agreed capacity with a G100 scheme.
How long does a commercial battery storage installation take?
Physical installation is typically 1-6 weeks on site for a behind-the-meter system. The overall programme, however, is set by the DNO: a G99 study and connection can run 3-18 months depending on network capacity in your area. We submit the G99 application alongside the survey so the clock starts immediately, and use a G100 limitation scheme where it lets the project proceed sooner. Grid-scale standalone projects run 18 months to several years including planning.
What is the G99 process and why does it drive the timeline?
G99 is the Energy Networks Association connection agreement required for storage above 16 A per phase, which covers almost every commercial system. The DNO reviews the connection, may require a network study, and sets the protection and metering requirements. Because network capacity is limited in many areas, the study and connection offer are usually the longest item on the programme. We prepare the application, single-line diagrams, and protection proposals, liaise with the DNO, and, where the network is constrained, engineer a G100 export/import limitation scheme so the site can connect within its existing agreed capacity.
Containerised outdoor BESS or an indoor cabinet, which suits my site?
It comes down to space, capacity, and fire strategy. A containerised outdoor system is usually the fastest route to multi-MWh capacity and keeps the fire and space constraints outside the building, but it needs prepared hardstanding, separation distances, and firefighting access. An indoor cabinet suits smaller systems (roughly 60-500 kWh) at sites with a suitable plant room or switchroom, but the room must be compartmented, ventilated, and fire-detected. We assess both against your available space, target capacity, and insurer requirements at the survey.