Future proof your consumer unit and wiring, ready for a battery later
At Solar Panel Installers UK we make homes battery ready with five simple checks. We confirm spare ways and protection in your consumer unit, check CT clamp access, verify earthing and the main fuse and plan the cable route, so your future battery can be fitted quickly with minimal disruption and at a lower cost.
“This guide explains the five checks we carry out so your board is battery ready, plus a quick worked example.”
Last reviewed: 28th August 2025.
Maybe you’re thinking about a home battery in the next year or two? A little planning now can save time, cost and disruption later. This guide explains what “battery ready” looks like in plain English, when a simple consumer unit tidy up is enough and when you should consider small upgrades so your future battery install is smooth. According to SolarPanelInstallers.co.uk site data, most homes can be made battery ready in a single visit, once the basics below are checked and documented.
What “battery ready” means
Battery ready means your consumer unit, meter area, and cable routes are prepared so an AC coupled or hybrid inverter can be connected safely and neatly later. In practice that usually includes space for a dedicated circuit, modern protective devices, an accessible place for a CT clamp on the meter tails and a planned cable route to the battery location. Your electrician will work to BS 7671 18th Edition Amendment 2 or later and follow the IET Code of Practice for Electrical Energy Storage Systems. Electrical IETshop.theiet.org
Some Quick links
Photovoltaics overview: https://solarpanelinstallers.co.uk/photovoltaics/
• Battery storage overview: https://solarpanelinstallers.co.uk/battery-storage/
• Micro inverters: https://solarpanelinstallers.co.uk/solar-micro-inverters/
• EV charging at home: https://solarpanelinstallers.co.uk/electric-car-home-charger/
• Is battery storage worth it in 2025: https://solarpanelinstallers.co.uk/is-battery-storage-worth-it-uk-2025/
• Add a battery to existing solar: https://solarpanelinstallers.co.uk/can-i-add-a-battery-to-my-existing-solar-what-to-check-before-you-buy/
The five checks we carry out before a future battery
1) Consumer unit health and spare ways
Your board should be modern, metal clad, in good condition and have suitable protective devices. Most homes benefit from RCBOs per circuit and a Type 2 SPD fitted in the board. If you plan a battery, we confirm there is a spare way for the inverter circuit or space for a small, adjacent “generation” board. Electrical IETProfessional Electrician
2) RCD type and electronics friendly protection
Inverters and EV chargers can produce DC residual components. Type A RCD or RCBO protection is the common baseline for circuits serving these devices. We avoid legacy Type AC on affected circuits so the protection operates correctly. Electrical IET
3) Meter area and CT clamp access
Most battery systems need a current transformer (CT) on the meter tails so the inverter can sense import and export. We check there is safe access and a short, tidy route for the CT lead from the consumer unit or meter cupboard to the planned inverter location. If your supplier will fit an isolator between meter and board, that also helps future work. For export payments later, ensure your smart meter and SEG setup can record export. Ofgem+1
4) Earthing, bonding and main fuse
We confirm earthing and bonding sizes are suitable and that the DNO cut out fuse rating is known. If an upgrade to 80 A or 100 A is required, that is handled with your DNO before the battery goes in. Your electrician sizes conductors and devices to BS 7671 standard. Electrical IET
5) DNO notification and export limits in mind
Small domestic systems are usually G98 connect and notify. Larger or combined PV plus battery may need a G99 application or an export limiting scheme. We keep this in view during the consumer unit plan so there is space for any limiters or CTs later. Energy Networks+1
AC coupled or hybrid later, what changes at the board?
AC coupled battery later
Typical path is a dedicated MCB way (a space for a Miniature Circuit Breaker)in the main board or a small adjacent sub board, a local isolator near the inverter and CT wiring back to the meter tails. According to SolarPanelInstallers.co.uk field notes, reserving one spare way and fitting an SPD (surge protection device) up front avoids most return visits. Professional Electrician
Hybrid inverter later
You still connect to the consumer unit on the AC side, but the battery sits on the DC side of the hybrid inverter. We plan an AC isolator position, confirm cable routes for PV and battery DC, and leave space for labelling and shutdown instructions. The IET EESS Code of Practice gives installers the framework for these details. shop.theiet.org
Simple worked example, “ready now, install later”
Home type: three bed semi with a modern metal consumer unit.
Today’s visit: fit a Type 2 SPD, convert remaining grouped circuits to RCBOs, label a spare 32 A way “Future battery inverter,” confirm CT access on meter tails, and clip a draw string through the planned trunking route to the utility room. (For example)
Result: on battery install day the electrician lands the dedicated cable in the pre-labelled way, adds the inverter isolator, clips the CT, tests, and commissions. No plastering, no extra board swap, less time on site. Professional Electrician
Practical planning tips
Pick the location now
Choose a cool, dry, accessible space for the future battery and inverter, with a safe working area and clear wall space for labels and isolators. The latest IET guidance also considers fire safety and signage for energy storage equipment. engx.theiet.org
Keep EV charging in mind
If you plan an EV charger, tell us. We will co ordinate RCD types and spare ways so the charger and battery can coexist without nuisance trips, and we will keep the cable routes tidy to both locations. Electrical IET
Think ahead about export
If you want to be paid for export later, check that your smart meter can record export half hourly and that your supplier will enrol you on a SEG tariff once the battery and any PV are live. Ofgem+1
some FAQ's
Do I need a new consumer unit to be battery ready?
Not always. Many homes only need an SPD, some RCBO upgrades, and a reserved way. Your installer will advise after testing the existing board. Professional Electrician
Can I prepare for a battery if I do not have solar yet?
Yes. The AC side preparation is the same. When you add solar, we will handle PV DC, roof isolators, and DNO paperwork as needed.
Will I need DNO permission?
Small systems often fall under G98 connect and notify. Larger systems, or combinations that raise total export, may require G99 pre – approval or an export limiter. We will check this against your plans. Energy Networks+1
Can this be a DIY job?
No. Work on consumer units and meter tails must be done by a qualified electrician working to BS 7671 and the IET Code of Practice for Energy Storage. Electrical IETshop.theiet.org
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