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EV Charger CT Clamps

A CT clamp is a sensor that fits around your incoming supply cable and measures the flow of electricity in real time. For EV charging, CT clamps serve two main purposes: solar divert, where the charger monitors surplus generation and diverts it to your car rather than exporting it; and load management, where the charger or charge point management system monitors total site load and adjusts charge rate to prevent the supply from being overloaded.

Most solar-compatible EV chargers require a CT clamp to enable real-time solar divert, although some models include one in the box. Load management CT clamps are similarly required for multi-charger installations where dynamic power sharing is configured.

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EV Charger CT Clamp FAQs

A CT clamp (current transformer clamp) is a sensor that fits around your supply cable and measures electricity flow in real time without breaking the circuit.

On an EV charger it serves two main purposes: solar diversion, where the charger monitors surplus solar generation and automatically diverts it to your car; and load management, where the charger adjusts its output to prevent the site's supply from being overloaded. Most solar-compatible chargers and multi-charger load management systems require a CT clamp to function correctly.

It depends on the charger. Some solar-compatible models include a CT clamp in the box; others require one to be purchased separately.

Check the product listing for your charger or its installation manual to confirm.

Four parameters need to match your installation: supply type (single-phase or three-phase); jaw diameter (must fit around your incoming supply cable — measure the cable diameter before ordering); current rating (must meet or exceed your supply rating, typically 100A for domestic installs); and connector type (some chargers require a specific connector).

Not necessarily — CT clamps are not universally interchangeable.

While the physical principle is the same across all clamps, jaw size, current rating, cable length and connector type must all be compatible with your charger and installation. Brand-specific clamps are designed and tested for their respective charger ecosystems and are the recommended choice.

Yes — dynamic load management requires real-time monitoring of total site consumption, which is provided by a CT clamp on the incoming supply.

Without a CT clamp, the chargers have no visibility of the site's overall load and cannot adjust output to prevent overloading the supply.

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