What the Sync Energy EVAB1ESP120 is

Sync Energy EVAB1ESP120 is a dynamic EV load balancer kit for single-phase electrical supplies. It is designed to sit between the building supply and compatible Sync Energy EV chargers, monitoring overall demand and then adjusting charger output to keep the installation within a defined current limit. The kit version includes the balancer in an IP20 steel enclosure with an integrated 6A MCB plus one 120A CT clamp, which makes it the correct choice where you need a ready-to-install enclosed unit rather than a DIN rail hub only.

In practical terms, that means the EVAB1ESP120 helps prevent nuisance tripping, overloaded supplies, and expensive capacity upgrades where more than one charger may operate on the same service. It is especially relevant on sites where the available headroom is limited but EV charging demand is growing.

Who it suits

Single-phase balancing is most useful where the building has one incoming phase and the EV charging load could compete with the rest of the property. That can apply to larger homes with more than one charger, small business premises, mixed-use sites, and managed parking areas using compatible Sync Energy chargers. Rather than allowing each charger to pull maximum output regardless of the wider site load, the balancer continuously shares available power more intelligently.

Because the unit supports up to 16 chargers per balancer, it also suits phased EV rollouts where the initial installation may be modest but future charger additions are likely. Using the correct balancer from the start can make later expansion simpler.

Key features and practical benefits

• Single-phase load management for compatible Sync Energy charger installations.
• Supplied in an IP20 enclosure with 6A MCB for a more complete installation package.
• Includes one 120A CT clamp for monitoring the site load on a typical single-phase supply.
• Supports communication with up to 16 chargers via RS485.
• Operates locally, so balancing is not dependent on a permanent cloud connection.
• RGB LED and buzzer status indication for commissioning and fault awareness.

The biggest buyer benefit is supply protection. On a site with multiple chargers, a normal unmanaged setup can push the total demand beyond what the incoming supply can support. The balancer reduces that risk by distributing available power across the connected chargers. That gives the installation a more controlled behaviour under peak demand and reduces the chance of an electrician having to revisit the job because the real-world load profile was not properly managed at the design stage.

Technical detail that matters in practice

EVAB1ESP120 is intended for single-phase installations up to 120A through the supplied CT clamp arrangement. The balancer itself takes a single-phase 220 to 240V, 50 to 60Hz electrical input and communicates with chargers over RS485. The published specification also states an internal meter accuracy equivalent to 2% Class C, with support for connection to an external RS485 Modbus meter where required.

The enclosure is white steel and IP20 rated, which means it is intended for indoor or otherwise suitably protected locations rather than exposed outdoor mounting. For installers, that matters because the product role is control and monitoring, not outdoor weatherproofing. The published operating temperature range of -25°C to +40°C provides a useful guide for plant room and internal service area suitability.

Another point that matters in real jobs is the difference between this kit and the DIN rail version. EVAB1ESP120 includes the enclosure and the correct single-phase 120A CT clamp, so it is the better match where a contained balancing assembly is preferred. If the project already has a suitable panel arrangement and the installer wants only the hub, the separate EVAB1D may be the better fit.

Installation and compatibility considerations

The balancer is intended for professional installation and setup as part of a compatible Sync Energy charger system. The CT clamp must be positioned correctly so the unit can read site load accurately. As with any load management product, poor CT orientation or unsuitable commissioning settings can undermine performance, so correct configuration is central to getting the result the site expects.

Because the unit communicates with compatible chargers over RS485, it is sensible to consider cable routing, enclosure position, and future expansion at the design stage. On sites where more chargers may be added later, leaving a clear route for communications and planning the current limit sensibly can save time on later visits.

For a more bespoke panel-board integration, Sync Energy also offers the EVAB1D dynamic load balancer module. Where the installation is three-phase rather than single-phase, the matching alternative is the EVAB1ETP400 three-phase kit. Compatible charging hardware can be explored through the wider home EV chargers and commercial EV chargers ranges.

Why this variant may be the right choice

The important distinction with EVAB1ESP120 is that it is not just a balancing concept or a bare controller. It is a defined single-phase kit with enclosure, MCB, and 120A CT clamp included. That makes specification easier where the supply arrangement is already known and the job needs a clear, contained balancing solution.

Compared with using no balancing at all, it gives the project a far better chance of operating as intended once real charger demand meets cooking loads, heating loads, or other building demand. Compared with the DIN rail hub-only option, it reduces the amount of additional enclosure planning required. Compared with the three-phase kit, it is the right fit where the site is plainly single-phase and there is no benefit in specifying a larger format solution.

FAQ

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