PAS 63100:2024: Your Home Battery Questions, Answered

You wanted to store some electricity. Perhaps make better use of your solar panels. Give your energy bill something to think about.

Now you’re reading about enclosures, fire separation and something called PAS 63100:2024.

Excellent. Another acronym. Just what your home improvement project needed.

We’ve been getting plenty of questions about how PAS 63100:2024 affects home battery installations. So, let’s tackle the big ones without making this feel like a training course with disappointing biscuits.

What actually is PAS 63100:2024?

PAS 63100:2024 is a specification covering fire safety for battery storage installations in homes. It addresses the equipment, its location and how the system works together. It isn’t simply a product approval badge.

That distinction matters when someone asks: “Is this battery PAS compliant?”

It’s a sensible question. But the battery is only part of the answer.

Does the 20kWh limit mean I can’t have a bigger system?

No. PAS sets a 20kWh limit per enclosure, alongside separate limits for total storage:

These are capacity limits, not automatic installation approval.

For example, two 16.1kWh batteries in separate qualifying enclosures total 32.2kWh. That differs from one enclosure containing 32.2kWh. Your installer must verify the enclosure arrangement and remaining requirements.

A single enclosure above 20kWh does not meet that limit simply because it goes outside.

The lesson? Check what’s inside each enclosure before getting distracted by the impressive total on the product page. We appreciate an impressive number as much as anyone.

Can the battery go inside my house?

Potentially. PAS prioritises outdoor installation where practicable. Indoor installations need an appropriate location, ventilation to outdoors and the required fire separation and detection arrangements.

Bedrooms, lofts and escape routes are among the prohibited locations. Outdoor positioning also has restrictions, including separation from doors, windows, ventilation openings and escape routes.

So “there’s a lovely gap next to the stairs” is a promising start for a bookshelf. It is not a battery installation assessment.

And the garage deserves some attention too. Before mentally moving the battery in, consider what already lives there. Paint, fuel, the lawnmower and seventeen things you’re definitely taking to the tip next weekend.

Your installer needs to assess the actual space. Including the bits outside the carefully cropped photograph.

What if my house is bigger than 200m²?

Dwellings above 200m² fall outside this PAS’s scope. Its principles can still apply, and it recommends consulting a fire safety expert. Being outside scope is not blanket permission.

A bigger garden does not come with a complimentary exemption from sensible battery planning.

Can an installer just sign it off with a risk assessment?

A risk assessment does not turn an unmet PAS requirement into compliance. PAS calls for installer verification and a statement of conformity.

Paperwork matters. It just isn’t a magic wand.

Ask your installer to explain the proposed arrangement, the requirements it meets and any limitations before you order. That conversation is considerably easier before a large battery arrives on your driveway.

Is PAS the same thing as the Wiring Regulations?

They are separate documents. The current Wiring Regulations, BS 7671:2018+A4:2026, include a dedicated chapter on stationary batteries. The IET confirms that the previous edition’s transition period ended on 15 October 2026.

For homeowners, the useful question is: “Which requirements are you designing my installation to, and what documentation will I receive?”

You shouldn’t need to become an electrical standards enthusiast to get a clear answer. Unless that’s your thing. We won’t judge.

Planning a Fogstar installation? Start with the space.

Before choosing your battery, speak to your installer about where it will go and how much storage your home needs. Bring the exact model and proposed configuration into that conversation.

Ask us about the Fogstar product details. Ask your installer to confirm the suitability of the complete installation.

We love a high-capacity battery. We also love a plan that’s been checked before delivery day.

This article is a homeowner overview, not an installation specification. Your installer should use the full, current requirements and the relevant manufacturer’s instructions.