Safety and regulations

Home energy storage systems are generally very safe when installed correctly. Modern lithium batteries (especially LFP types) are designed with multiple layers of safety protection to prevent overheating and electrical faults.

1. Safety Standards

Any battery installed in the UK should comply with international and national safety standards, including:

  • CE/UKCA Marking: Ensures the product meets UK safety, health, and environmental requirements.
  • BS EN 62619: The standard for secondary lithium cells and batteries for use in industrial applications (including home storage).
  • PAS 63100: A new UK specification specifically for the design and installation of battery energy storage systems in dwellings.

2. Grid Connection (G98 and G99)

By law, your battery must be registered with the Distribution Network Operator (DNO).

  • G98: For small systems (under 3.68kW per phase). This is a “connect and notify” process.
  • G99: For larger systems. You must apply for permission before the installation takes place. Your installer should handle these applications for you.

3. Fire Safety

While extremely rare, lithium battery fires are difficult to extinguish. To minimise risk:

  • Detection: Install a heat detector (not a smoke detector) in the room where the battery is located.
  • Escape Routes: Avoid installing batteries in the only exit route from a property (e.g., a small hallway).
  • Ventilation: Ensure the battery has enough space to stay cool.

4. Professional Certification

To ensure your installation is safe and legal, always use:

  • MCS-Certified Installer: Required for many insurance policies and to prove the quality of the installation.
  • Part P Registered Electrician: Ensures the electrical work complies with Building Regulations.

5. Emergency Shutdown

You and everyone in your household should know how to turn off the battery in an emergency. There will usually be:

  1. A DC Isolator (between the panels and battery).
  2. An AC Isolator (between the battery/inverter and your consumer unit).
  3. A Battery Switch on the unit itself.

Important: Never attempt to open or repair a battery casing yourself. If the casing is damaged, leaking, or bulging, turn off the system at the isolators and contact your installer immediately.