Why You May Need an Add-on Consumer Unit + SPD – When you decide to install a EV charger, your home’s existing electrical panel known as a consumer unit or fuse box is the first thing we have to evaluate. In many homes, we find that the main consumer unit simply isn’t ready to take on the load of a modern EV charger. Rather than forcing you to pay for a costly replacement of your property’s entire fuse box, we can install a compact Add-on Consumer Unit with a built-in Surge Protection Device (SPD).

Here are the two main reasons why we use these units to make your installation safe, legal, and efficient –

1. Your Existing Consumer Unit is Full or Outdated

To safely install an EV charger, we need to wire it into its own dedicated fuse (circuit breaker). However, we frequently run into two common scenarios in UK homes:

• The unit is full: There are physically no spare slots left in your current fuse box to add a new circuit.

• The unit is outdated: Older consumer units may not meet modern safety standards or may lack the specific protective switches required by the 18th Edition wiring regulations for EV charging.

The Solution – Instead of tearing out your working fuse box and replacing the whole thing, we leave your existing setup exactly as it is. We simply install a small, dedicated “add on” consumer unit right next to it (or beside your electricity meter box). Your EV charger runs safely and independently from this new unit without overloading your home’s original system.

2. Guarding Your Home and Car Against Power Surges (SPD)

Modern regulations require surge protection for new power circuits in most residential settings. Because of this, our add-on consumer units come equipped with a Surge Protection Device (SPD).

• What it does: Power surges can happen in the blink of an eye due to grid switching or nearby lightning strikes.

• Why it matters: These massive spikes of electricity can instantly fry the sensitive, expensive microelectronics inside your EV charger and your electric vehicle’s onboard computers.

• The SPD acts as a lightning-fast safety barrier, intercepting high-voltage spikes and safely diverting them into the ground before they can reach and damage your equipment.

The Bottom Line – An add-on consumer unit with an SPD is the most cost-effective and least disruptive way to bring an older or full electrical system up to modern safety standards. It gives your EV charger its own dedicated, protected source of power.