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NAPIT Registered · New & Retrofit

Battery Storage Installation

Store the electricity you generate and use it when you need it. Properly sized, properly installed battery systems for homes across Essex, Suffolk, Norfolk, Cambridgeshire and Hertfordshire.

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Why Afta Electrical
NAPIT RegisteredApproved electrical contractor
TrustMarkGovernment endorsed
Est. 201510+ years in renewables
From £3,9955kWh installed

About This Service

Use more of what you generate

A solar panel system without battery storage typically achieves 30–40% self-consumption — meaning most of what you generate is exported at a fraction of what you'd pay to import it back. A correctly sized battery brings self-consumption to 70–85%, dramatically improving your return on investment.

We supply and install Tesla Powerwall, Fox ESS, SolaX and SolarEdge battery systems — all established brands with strong UK technical support, app-based monitoring and firmware that is actively maintained. We do not install battery systems we can't fully support post-installation.

Sizing matters more than brand

The most common mistake in battery storage is under-sizing. A 5kWh battery on a 6kW solar system will fill by midday on a summer day and export the rest anyway. We review your generation data and consumption profile before recommending a capacity — and we'll tell you honestly when a larger battery won't pay back the premium.

Octopus Agile and time-of-use tariffs

Modern battery systems can be programmed to charge from the grid during off-peak periods (typically 00:30–04:30 on Octopus Agile) when electricity can cost 5–7p/kWh, then discharge during peak periods at 25–35p/kWh. This "grid arbitrage" function is included in the setup and commissioning of every system we install.

New install or retrofit?

We install battery storage alongside new solar systems and as retrofits to existing solar installations — including systems originally installed by other companies. Retrofit compatibility depends on your existing inverter; we'll advise during the survey whether an AC-coupled or DC-coupled battery is the right solution.

Certification for retrofits

Battery retrofits to existing professionally installed solar systems are themselves eligible for installation certification. We handle the paperwork and lodge the certificate on your behalf.

Tesla Powerwall, Fox ESS, SolaX & SolarEdge

Proven brands with UK-based technical support, app monitoring and active firmware development.

AC and DC coupling options

AC-coupled for retrofits to existing inverters. DC-coupled for new solar + battery installations. We specify the right architecture.

Grid arbitrage setup

Programmed for time-of-use tariffs including Octopus Agile. Charge cheap, discharge during peak — configured on commissioning.

10-year battery warranty

All batteries we supply carry manufacturer warranties of 10 years or 6,000+ cycles. Warranty registration handled by us.

DNO notification included

Battery storage systems require G98 or G99 notification. We handle this as part of every installation.

What's Included

Every battery installation includes

Pre-install assessment

Review of your generation data, import/export history and consumption profile. Written recommendation with self-consumption modelling.

Battery system supply

Tesla Powerwall, SolaX or SolarEdge — selected for inverter compatibility and sized to your actual consumption. Fully warranted.

Installation & wiring

Wall-mounting, DC/AC cabling, protection devices and isolators. Indoor or garage location to manufacturer specification.

Commissioning & programming

Full system commissioning. Time-of-use tariff setup. App connection and monitoring configured and tested before we leave.

DNO notification

G98 or G99 application submitted on your behalf. Certificate of compliance issued and provided with handover pack.

Installation certificate

Full installation certification issued on completion. Required for SEG eligibility and future government incentive schemes.

Want to know how much a battery could save you?

We'll model your generation data against current tariffs and give you a realistic payback figure — not a best-case estimate.
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Indicative Pricing

Battery storage pricing

Installed prices including battery, inverter/charger (where required), mounting, cabling, protection devices, commissioning and DNO notification. VAT at 0% applies to residential installations with solar.

5kWh
Entry System
£3,995–£5,495

Suits 1–3 bed properties with up to 4kW solar. Covers most evening demand from daytime generation.

  • Single battery module
  • SolaX or SolarEdge
  • App monitoring included
  • 10-year warranty
MOST POPULAR
Tesla Powerwall System
£8,995 from

Premium whole-home battery storage with seamless backup capability and Tesla's industry-leading app.

⚡ Whole-Home Backup Capability
  • Tesla Powerwall 3
  • Tesla Gateway included
  • Automatic outage protection
  • Whole-home backup configuration
  • Full commissioning
  • Tesla app setup
  • Electrical certification
  • DNO application handled
Best for: Homeowners wanting energy independence, EV charging integration, and automatic power backup.
15kWh+
High Capacity
£8,995+

Large homes, EV charging, heat pumps or high overnight consumption. Multi-module stack systems.

  • Stackable modular design
  • Three-phase options available
  • EPS/backup power option
  • Priority scheduling

Retrofit installations to existing solar may incur additional costs depending on inverter compatibility. View full pricing page →

Common Questions

Battery storage FAQs

Do I need solar panels to have a battery?
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No. A standalone battery (sometimes called a grid battery) can be charged entirely from the grid during cheap overnight tariff periods and discharged during peak-price hours. This is increasingly popular with Octopus Agile customers. However, the economics are typically more favourable when paired with solar generation.
Can a battery power my home during a power cut?
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Some battery systems include an Emergency Power Supply (EPS) function that automatically disconnects from the grid and powers a designated circuit during a power cut. Not all batteries support this — SolaX's AIO range does. We'll advise which models include this feature and what limitations apply (e.g. maximum load, no large motor loads at startup).
Will a battery retrofit void my existing solar warranty?
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Not if installed correctly. Adding an AC-coupled battery (connected on the AC side of the existing inverter) has no impact on your solar panels or inverter warranty. DC-coupled retrofits connect to the solar DC circuit and may require inverter manufacturer approval — we'll confirm before specifying any DC-coupled solution.
Where is the battery installed?
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Most batteries are installed indoors — utility room, garage, or under-stairs cupboard. They need to be within certain temperature ranges (typically 0–45°C) and away from direct heat sources. We'll advise on the most suitable location during the survey, and all installations include a wall-mounted bracket or floor-standing option as appropriate.
How long does a battery installation take?
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Most battery installations are completed in half a day to a full day. More complex retrofits involving consumer unit work or additional circuit protection may require a full day. We'll give you a specific estimate when booking.
What is the expected lifespan of a battery system?
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Modern lithium iron phosphate (LFP) batteries — the chemistry used by SolaX and most premium brands — are warranted for 6,000+ cycles and typically last 15–20 years in domestic use. LFP is more thermally stable and tolerant of regular deep cycling than the NMC chemistry found in some EV batteries and lower-cost storage units.

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Solar PV Installation

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Battery Retrofits

Adding battery storage to an existing solar installation — including systems installed by other companies.

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Solar + Battery Packages

Combined systems from £9,995. Better value than buying separately and optimised as an integrated installation.

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Free Battery Storage Survey

Find the right battery for your home

Answer 7 quick questions and we'll recommend the right battery system for your property and energy needs. Takes under 2 minutes.

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Question 1 of 7
What type of property is it?
This helps us recommend the right battery capacity for your energy use.
Question 2 of 7
Do you already have solar panels?
Battery storage works best paired with solar — but can also charge from the grid on off-peak tariffs.
Question 3 of 7
What is your main reason for wanting battery storage?
Understanding your priority helps us size and spec the right system.
Question 4 of 7
What is your approximate monthly electricity bill?
This helps us estimate your potential savings and payback period.
Question 5 of 7
Do you have or plan to get an electric vehicle?
Combining battery storage with EV smart-charging can significantly cut costs.
Question 6 of 7
Do you have a battery brand preference?
We install Tesla Powerwall, Fox ESS and SolaX — all excellent options.
Question 7 of 7
Almost done — where shall we send your results?
We'll review your answers and get back to you with honest, tailored advice. No hard sell, no spam.

Thank you — we'll be in touch soon!

We've received your battery storage survey. One of our specialists will review your answers and come back with tailored recommendations — usually within one business day.

Ready to make more of your
solar generation?

We'll assess your system, model the savings, and recommend the right battery — not the most expensive one. Honest advice from a team that installs what it recommends.

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