Victron VM-3P5A Three-Phase Energy Meter RS-485 | REL200320100

The Victron VM-3P5A is a three-phase energy meter built for use with Victron GX devices. It measures AC energy flow at the grid connection point or on AC loads, giving a GX-connected system real-time visibility of import, export and consumption. It suits professional solar, off-grid and grid-tied installations that need three-phase monitoring.

Key features

• Measurement, three-phase AC energy measurement using 5 A current transformer inputs, compatible with external CTs for non-intrusive installation.
• Integration, connects to Victron GX devices (Cerbo GX, Venus GX, Color Control GX) via RS-485 Modbus communication.
• Import and export, measures both directions, suited to grid-tied systems with feed-in monitoring requirements.
• Roles, can be configured as a grid meter, generator meter or AC load meter within the GX device interface.
• Mounting, DIN rail mounting, weight 0.3 kg.

Product overview

The VM-3P5A connects to a Victron GX device over RS-485 and reports real-time power, voltage, current and energy totals for each of the three phases. This feeds directly into the VRM portal and the local GX display, replacing inverter-side estimates with measured data.

Because the CT input is rated at 5 A, the meter itself carries no mains current. External current transformers clamp around the live conductors, avoiding the need to break the main supply cables. One unit can monitor the grid connection point while a second monitors a generator or sub-load, with role assignment handled in the GX device settings menu.

Applications

• Grid connection point monitoring on three-phase ESS installations with Victron Multi or Quattro inverter-chargers.
• Feed-in and import measurement for three-phase grid-tied solar systems.
• Generator monitoring alongside a three-phase generator and a Victron GX device.
• AC load sub-metering to track consumption of specific circuits or buildings.

What's in the box

• 1 x Victron Energy Meter VM-3P5A (REL200320100)

Installation notes

Installation must be carried out by a qualified electrician, connecting to the AC distribution board via external current transformers and to the GX device over a wired RS-485 connection. Correct CT orientation is required for accurate import and export readings. Grid-connected UK installations must comply with G98 or G99 as applicable. Current transformers are not included and must be sourced separately to match the site's cable size and current rating.