The Victron UFR1001E is an anti-islanding relay for grid-connected solar and inverter installations in the UK. It monitors grid frequency and voltage at the point of connection and disconnects the inverter when either parameter falls outside safe limits, supporting G98 or G99 compliance for qualified installers.

Key features

• Continuously monitors grid frequency and voltage, tripping the relay when thresholds are exceeded
• Supports G98 and G99 compliance requirements for UK grid-connected solar PV systems
• Weighs 0.23 kg, small enough for standard enclosures
• Works with Victron inverters and inverter/chargers in grid-tied configurations
• Provides automatic disconnection to prevent back-feeding into a de-energised grid

Product overview

Anti-islanding protection is a mandatory requirement for grid-connected inverter systems in the UK. Without it, an inverter can keep energising the local network after the grid goes down, putting utility engineers at risk on lines they believe are dead. The UFR1001E is a dedicated external relay rather than a software-only function, so it can satisfy DNO or local authority requirements for a physical disconnect device as part of a G98 or G99 application. It wires into the AC side of the installation and operates independently of the inverter's own internal protection, adding a hardware layer of disconnection.

Applications

Suited to grid-connected solar PV systems requiring G98 or G99 DNO notification, Victron inverter and inverter/charger installations specifying a physical anti-islanding disconnect, and retrofit protection on existing grid-tied systems, both commercial and residential.

Installation notes

Fitting must be carried out by a qualified electrician experienced with grid-connected solar PV wiring. G98 or G99 notification to the relevant DNO is required before energising the system, and the relay must be wired according to the manufacturer's diagram and any DNO-specific requirements.

What's included

• 1 x Victron UFR1001E Anti-Islanding Relay