Load Curtailment

EV Chargers & Your Home Supply 🏠

Example of the External CT Fitted

An EV charger is a big energy user (32A) on your home’s supply, and it can run for a long time—potentially more than 12 hours! ⏳

 

UK Homes usually have a main fuse rated at 60A, 80A, or 100A.

With this in mind it is important to manage the load the charger is puts on your home supply.

Load Curtailment helps by:

• 🔍 Monitoring the load on your home supply
• 🔽 Reducing the charger’s power if you’re close to the fuse limit
• 🔼 Increasing the power again when there’s capacity available

Load curtailment requires the External Current Transformer (CT) to be fitted.

 

---

How Load Curtailment Works

The graph below shows that when your other home appliances (like ovens, kettles, or heating) use more power, the EV charger automatically lowers its charging rate to keep the total load below the fuse limit (in this example, 60A).

Then once those other loads drop back down, the charger ramps up to full power again so you can keep charging efficiently! 🔋

---

Note: If the External Current Transformer (CT) is removed or disconnected, the charger will de-rate and charge at a slower rate of ~1.4kW (6A) to protect the main fuse.