💡 Key Takeaway: Dynamic load balancing automatically adjusts your EV's charging speed based on what else is using electricity in your home. It prevents overloading your supply, avoids tripping your main fuse, and lets you charge at the fastest safe speed at all times. Most premium chargers include it — and it's one of the main reasons they're worth the extra cost.
## What Problem Does Load Balancing Solve?
Every UK home has a **main fuse** (also called a service fuse or cut-out) that limits the total electricity your property can draw at any moment. The most common size for UK homes is **60A** or **80A on a single phase** — though some older properties may have as little as 40A.
Here's the issue: a 7.4kW EV charger draws approximately **32A** on its own. That's a significant chunk of your total capacity.
Now imagine this scenario:
- EV charger running at full power: **32A**
- Electric oven: **13A**
- Kettle: **13A**
- Washing machine: **10A**
- Other background loads: **5A**
**Total: 73A** — which exceeds a 60A fuse and comes dangerously close to an 80A one.
Without load balancing, your main fuse blows. The power goes off. Everything stops. And if this happens repeatedly, it can damage your electrical installation or — in a worst case — create a fire risk.
**Load balancing prevents this** by automatically reducing the charger's power draw when other household appliances are using electricity, then ramping back up when demand drops. Your car still gets charged, your house still functions normally, and your main fuse never trips.
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## How It Works: CT Clamps Explained
The key hardware component in most load balancing systems is a **CT clamp** — a small ring-shaped sensor that clips around the main electrical cable at your consumer unit (fuse board).
**CT stands for "current transformer."** The clamp doesn't touch any wires directly — it measures the electromagnetic field around the cable to determine how much current is flowing through it. This reading is sent to the charger in real time.
Here's the process:
1. **The CT clamp measures** total household electricity consumption continuously
2. **The charger calculates** how much spare capacity is available (total fuse rating minus current household load)
3. **The charger adjusts** its own power draw to use only the available spare capacity
4. **If household demand increases** (you turn on the oven), the charger automatically reduces power
5. **If household demand drops** (the oven finishes), the charger ramps back up
This all happens automatically, in real time, with no input from you. You just plug in and the charger handles the rest.
**Installation note:** The CT clamp is fitted by the electrician during charger installation. It clips around the main incoming cable (usually the meter tails) inside or near your consumer unit. It's a quick, non-invasive addition — typically adding only 15–20 minutes to the installation time.
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## Dynamic vs Static Load Balancing
There are two types of load balancing, and the difference matters:
### Static Load Balancing
With static load balancing, the installer sets a **fixed maximum current** for the charger during installation. This limit doesn't change based on what else is running in your home.
For example, if you have a 60A main fuse and the installer estimates your typical household load at 20A, they might set the charger to a maximum of 24A (leaving a safety margin). The charger never exceeds this, regardless of whether your house is actually using 5A or 35A at any given moment.
**Pros:**
- Simple — no CT clamp or special hardware needed
- Works with any charger (the installer just turns down the maximum current)
- Reliable — nothing to go wrong
**Cons:**
- **Conservative and wasteful.** The charger is limited based on a worst-case estimate, not actual demand. Most of the time, you're charging slower than you need to.
- **Doesn't prevent overloads during unusual demand.** If you happen to run more appliances than the installer estimated, you could still trip the fuse.
- Slower overnight charging — a 24A limit means about 5.5kW instead of the full 7.4kW
### Dynamic Load Balancing
Dynamic load balancing uses a **CT clamp** (or built-in energy meter) to monitor actual household consumption in real time and adjust the charger's output accordingly.
**Pros:**
- **Charges at the fastest safe speed at all times.** At 2am when nothing else is on, you get the full 7.4kW. At 6pm when you're cooking dinner, the charger drops to 3–4kW.
- **Actually prevents overloads.** Because it responds to real-time demand, it can handle any combination of appliances.
- **Charges faster overall.** Over a typical overnight session, dynamic load balancing delivers significantly more energy than a static limit because it exploits every available amp.
**Cons:**
- Requires a CT clamp or built-in meter (adds a small amount to installation cost/complexity)
- Very rarely, communication issues between CT clamp and charger can occur (usually a Wi-Fi or signal issue)
**The verdict:** Dynamic load balancing is better in virtually every way. It's the standard on all premium chargers, and the small additional installation complexity is well worth it.
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## Why Load Balancing Matters for You
### 1. Safety
This is the most important reason. Overloading your main fuse isn't just an inconvenience — it's a safety risk. Repeated overcurrent events stress your electrical connections and can lead to overheating. Dynamic load balancing eliminates this risk entirely.
### 2. Faster Charging
Counterintuitively, load balancing *speeds up* your overnight charging. Without it, a static limit (say, 24A) caps your speed all night. With dynamic balancing, the charger runs at the full 32A during the quiet hours when nothing else is drawing power — which is most of the night.
For a typical overnight charge from 20% to 80% on a 60kWh battery:
- **Static limit (24A / 5.5kW):** ~6.5 hours
- **Dynamic balancing (up to 32A / 7.4kW):** ~4.9 hours
That difference matters if you're on a smart tariff with a 6-hour off-peak window. Dynamic balancing means your charge completes comfortably within the cheap window; a static limit might not.
### 3. No Lifestyle Compromise
Without load balancing, some installers advise customers to "avoid using high-power appliances while charging." That's not a practical solution — nobody wants to think about whether they're allowed to use the oven because the car is plugged in.
Dynamic load balancing means you never have to think about it. Cook dinner, run the tumble dryer, boil the kettle — the charger quietly adjusts in the background.
### 4. Future-Proofing
As households add more electrical loads — heat pumps, battery storage, induction hobs — the demands on your supply will only increase. Dynamic load balancing ensures your EV charger plays nicely with everything else, now and in the future.
If you're planning to add a heat pump or [solar panels with battery storage](/guides/ev-charger-solar-panels-uk/), dynamic load balancing isn't optional — it's essential.
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## Which Chargers Include Dynamic Load Balancing?
Here's the good news: every charger we recommend on Logistryx includes dynamic load balancing, either built-in or via an included CT clamp.
| Charger | Load Balancing Type | How It Works |
|---|---|---|
| Ohme Home Pro | Dynamic (CT clamp included) | CT clamp clips to meter tails; charger adjusts via app |
| Myenergi Zappi | Dynamic (CT clamp included) | CT clamp required; also manages solar diversion |
| Hypervolt Home 3 | Dynamic (built-in energy meter) | No separate CT clamp needed — meter is integrated |
| Easee One | Dynamic (built-in + multi-charger) | Built-in current measurement; wirelessly balances across multiple Easee chargers |
| Indra Smart Pro | Dynamic (CT clamp) | CT clamp included; also supports V2G load management |
| Wallbox Pulsar Plus | Dynamic (optional Power Boost CT clamp) | CT clamp available as add-on called "Power Boost" |
| Pod Point Solo 3 | Static only | Installer sets fixed maximum current; no dynamic adjustment |